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# |
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# NOTE: |
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# - $! is tested in background.test.sh |
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# - $- is tested in sh-options |
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# |
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# TODO: It would be nice to make a table, like: |
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# |
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# $$ $BASHPID $PPID $SHLVL $BASH_SUBSHELL |
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# X |
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# (Subshell, Command Sub, Pipeline, Spawn $0) |
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# |
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# And see whether the variable changed. |
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|
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#### $PWD is set |
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# Just test that it has a slash for now. |
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echo $PWD | grep / |
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## status: 0 |
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|
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#### $PWD is not only set, but exported |
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env | grep PWD |
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## status: 0 |
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## BUG mksh status: 1 |
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|
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#### $PATH is set if unset at startup |
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|
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# Get absolute path before changing PATH |
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sh=$(which $SH) |
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|
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old_path=$PATH |
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unset PATH |
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|
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$sh -c 'echo $PATH' > path.txt |
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|
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PATH=$old_path |
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|
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# looks like PATH=/usr/bin:/bin for mksh, but more complicated for others |
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# cat path.txt |
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|
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# should contain /usr/bin |
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if egrep -q '(^|:)/usr/bin($|:)' path.txt; then |
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echo yes |
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fi |
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|
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# should contain /bin |
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if egrep -q '(^|:)/bin($|:)' path.txt ; then |
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echo yes |
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fi |
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|
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## STDOUT: |
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yes |
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yes |
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## END |
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|
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|
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#### $HOME is NOT set |
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case $SH in *zsh) echo 'zsh sets HOME'; exit ;; esac |
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|
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home=$(echo $HOME) |
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test "$home" = "" |
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echo status=$? |
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|
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env | grep HOME |
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echo status=$? |
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|
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# not in interactive shell either |
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$SH -i -c 'echo $HOME' | grep / |
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echo status=$? |
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|
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## STDOUT: |
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status=0 |
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status=1 |
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status=1 |
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## END |
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## BUG zsh STDOUT: |
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zsh sets HOME |
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## END |
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|
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|
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#### $1 .. $9 are scoped, while $0 is not |
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fun() { echo $0 $1 $2 | sed -e 's/.*sh/sh/'; } |
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fun a b |
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## stdout: sh a b |
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## BUG zsh stdout: fun a b |
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|
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#### $? |
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echo $? # starts out as 0 |
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sh -c 'exit 33' |
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echo $? |
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## STDOUT: |
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0 |
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33 |
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## END |
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## status: 0 |
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|
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#### $# |
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set -- 1 2 3 4 |
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echo $# |
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## stdout: 4 |
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## status: 0 |
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|
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#### $_ |
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# This is bash-specific. |
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echo hi |
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echo $_ |
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## stdout-json: "hi\nhi\n" |
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## N-I dash/mksh stdout-json: "hi\n\n" |
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|
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#### $$ looks like a PID |
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# Just test that it has decimal digits |
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echo $$ | egrep '[0-9]+' |
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## status: 0 |
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|
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#### $$ doesn't change with subshell or command sub |
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# Just test that it has decimal digits |
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set -o errexit |
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die() { |
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echo 1>&2 "$@"; exit 1 |
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} |
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parent=$$ |
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test -n "$parent" || die "empty PID in parent" |
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( child=$$ |
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test -n "$child" || die "empty PID in subshell" |
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test "$parent" = "$child" || die "should be equal: $parent != $child" |
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echo 'subshell OK' |
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) |
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echo $( child=$$ |
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test -n "$child" || die "empty PID in command sub" |
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test "$parent" = "$child" || die "should be equal: $parent != $child" |
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echo 'command sub OK' |
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) |
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exit 3 # make sure we got here |
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## status: 3 |
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## STDOUT: |
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subshell OK |
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command sub OK |
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## END |
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|
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#### $BASHPID DOES change with subshell and command sub |
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set -o errexit |
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die() { |
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echo 1>&2 "$@"; exit 1 |
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} |
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parent=$BASHPID |
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test -n "$parent" || die "empty BASHPID in parent" |
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( child=$BASHPID |
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test -n "$child" || die "empty BASHPID in subshell" |
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test "$parent" != "$child" || die "should not be equal: $parent = $child" |
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echo 'subshell OK' |
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) |
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echo $( child=$BASHPID |
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test -n "$child" || die "empty BASHPID in command sub" |
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test "$parent" != "$child" || |
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die "should not be equal: $parent = $child" |
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echo 'command sub OK' |
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) |
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exit 3 # make sure we got here |
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|
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# mksh also implements BASHPID! |
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|
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## status: 3 |
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## STDOUT: |
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subshell OK |
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command sub OK |
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## END |
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## N-I dash/zsh status: 1 |
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## N-I dash/zsh stdout-json: "" |
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|
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#### Background PID $! looks like a PID |
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sleep 0.01 & |
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pid=$! |
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wait |
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echo $pid | egrep '[0-9]+' >/dev/null |
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echo status=$? |
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## stdout: status=0 |
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|
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#### $PPID |
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echo $PPID | egrep '[0-9]+' |
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## status: 0 |
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|
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# NOTE: There is also $BASHPID |
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|
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#### $PIPESTATUS |
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echo hi | sh -c 'cat; exit 33' | wc -l >/dev/null |
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argv.py "${PIPESTATUS[@]}" |
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## status: 0 |
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## STDOUT: |
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['0', '33', '0'] |
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## END |
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## N-I dash stdout-json: "" |
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## N-I dash status: 2 |
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## N-I zsh STDOUT: |
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[''] |
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## END |
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|
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#### $RANDOM |
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expr $0 : '.*/osh$' && exit 99 # Disabled because of spec-runner.sh issue |
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echo $RANDOM | egrep '[0-9]+' |
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## status: 0 |
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## N-I dash status: 1 |
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|
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#### $UID and $EUID |
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# These are both bash-specific. |
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set -o errexit |
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echo $UID | egrep -o '[0-9]+' >/dev/null |
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echo $EUID | egrep -o '[0-9]+' >/dev/null |
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echo status=$? |
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## stdout: status=0 |
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## N-I dash/mksh stdout-json: "" |
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## N-I dash/mksh status: 1 |
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|
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#### $OSTYPE is non-empty |
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test -n "$OSTYPE" |
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echo status=$? |
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## STDOUT: |
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status=0 |
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## END |
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## N-I dash/mksh STDOUT: |
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status=1 |
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## END |
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|
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#### $HOSTNAME |
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test "$HOSTNAME" = "$(hostname)" |
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echo status=$? |
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## STDOUT: |
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status=0 |
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## END |
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## N-I dash/mksh/zsh STDOUT: |
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status=1 |
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## END |
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|
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#### $LINENO is the current line, not line of function call |
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echo $LINENO # first line |
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g() { |
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argv.py $LINENO # line 3 |
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} |
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f() { |
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argv.py $LINENO # line 6 |
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g |
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argv.py $LINENO # line 8 |
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} |
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f |
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## STDOUT: |
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1 |
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['6'] |
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['3'] |
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['8'] |
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## END |
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## BUG zsh STDOUT: |
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1 |
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['1'] |
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['1'] |
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['3'] |
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## END |
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## BUG dash STDOUT: |
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1 |
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['2'] |
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['2'] |
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['4'] |
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## END |
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|
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#### $LINENO in "bare" redirect arg (bug regression) |
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filename=$TMP/bare3 |
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rm -f $filename |
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> $TMP/bare$LINENO |
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test -f $filename && echo written |
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echo $LINENO |
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## STDOUT: |
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written |
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5 |
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## END |
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## BUG zsh STDOUT: |
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## END |
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|
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#### $LINENO in redirect arg (bug regression) |
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filename=$TMP/lineno_regression3 |
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rm -f $filename |
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echo x > $TMP/lineno_regression$LINENO |
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test -f $filename && echo written |
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echo $LINENO |
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## STDOUT: |
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written |
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5 |
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## END |
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|
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#### $LINENO for [[ |
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echo one |
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[[ $LINENO -eq 2 ]] && echo OK |
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## STDOUT: |
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one |
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OK |
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## END |
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## N-I dash status: 127 |
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## N-I dash stdout: one |
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## N-I mksh status: 1 |
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## N-I mksh stdout: one |
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|
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#### $LINENO for (( |
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echo one |
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(( x = LINENO )) |
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echo $x |
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## STDOUT: |
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one |
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2 |
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## END |
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## N-I dash stdout-json: "one\n\n" |
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|
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#### $LINENO in for loop |
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# hm bash doesn't take into account the word break. That's OK; we won't either. |
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echo one |
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for x in \ |
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$LINENO zzz; do |
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echo $x |
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done |
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## STDOUT: |
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one |
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2 |
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zzz |
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## END |
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## OK mksh STDOUT: |
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one |
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1 |
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zzz |
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## END |
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|
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#### $LINENO in other for loops |
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set -- a b c |
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for x; do |
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echo $LINENO $x |
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done |
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## STDOUT: |
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3 a |
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3 b |
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3 c |
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## END |
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|
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#### $LINENO in for (( loop |
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# This is a real edge case that I'm not sure we care about. We would have to |
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# change the span ID inside the loop to make it really correct. |
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echo one |
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for (( i = 0; i < $LINENO; i++ )); do |
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echo $i |
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done |
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## STDOUT: |
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one |
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0 |
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1 |
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## END |
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## N-I dash stdout: one |
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## N-I dash status: 2 |
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## BUG mksh stdout: one |
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## BUG mksh status: 1 |
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|
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#### $LINENO for assignment |
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a1=$LINENO a2=$LINENO |
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b1=$LINENO b2=$LINENO |
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echo $a1 $a2 |
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echo $b1 $b2 |
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## STDOUT: |
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1 1 |
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2 2 |
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## END |
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|
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|
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#### $_ |
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: 1 |
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echo $_ |
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: 'foo'"bar" |
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echo $_ |
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## STDOUT: |
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1 |
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foobar |
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## END |
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## N-I dash/mksh stdout-json: "\n\n" |
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|
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#### $_ with assignments, arrays, etc. |
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case $SH in (dash|mksh) exit ;; esac |
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|
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: foo |
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echo $_ |
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|
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s=bar |
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echo s:$_ |
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|
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# zsh uses declare; bash uses s=bar |
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declare s=bar |
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echo s:$_ |
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|
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# zsh remains s:declare, bash resets it |
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a=(1 2) |
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echo a:$_ |
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|
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# zsh sets it to declare, bash uses the LHS a |
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declare a=(1 2) |
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echo a:$_ |
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|
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declare -g a=(1 2) |
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echo flag:$_ |
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|
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## STDOUT: |
400 |
foo |
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s: |
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s:s=bar |
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a: |
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a:a |
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flag:a |
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## END |
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## OK zsh STDOUT: |
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foo |
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s: |
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s:declare |
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a:s:declare |
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a:declare |
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flag:-g |
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## END |
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## N-I dash/mksh stdout-json: "" |
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|
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#### $_ undefined |
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set -e |
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|
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# seems to be set to $0 at first, interesting. |
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x=$($SH -u -c 'echo $_') |
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test -n "$x" |
423 |
echo nonempty=$? |
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## STDOUT: |
425 |
nonempty=0 |
426 |
## END |
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## OK zsh status: 1 |
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## OK zsh stdout-json: "" |
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## N-I dash status: 2 |
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## N-I dash stdout-json: "" |
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|
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#### BASH_VERSION / OIL_VERSION |
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case $SH in |
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(bash) |
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# BASH_VERSION=zz |
436 |
|
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echo $BASH_VERSION | egrep -o '4\.4\.0' > /dev/null |
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echo matched=$? |
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;; |
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(*osh) |
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# note: version string is mutable like in bash. I guess that's useful for |
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# testing? We might want a strict mode to eliminate that? |
443 |
|
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echo $OIL_VERSION | egrep -o '[0-9]+\.[0-9]+\.' > /dev/null |
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echo matched=$? |
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;; |
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(*) |
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echo 'no version' |
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;; |
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esac |
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## STDOUT: |
452 |
matched=0 |
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## END |
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## N-I dash/mksh/zsh STDOUT: |
455 |
no version |
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## END |