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#!/usr/bin/env bash |
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# |
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# Tests for pipelines. |
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# NOTE: Grammatically, ! is part of the pipeline: |
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# |
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# pipeline : pipe_sequence |
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# | Bang pipe_sequence |
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|
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#### Brace group in pipeline |
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{ echo one; echo two; } | tac |
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## stdout-json: "two\none\n" |
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|
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#### For loop starts pipeline |
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for w in one two; do |
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echo $w |
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done | tac |
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## stdout-json: "two\none\n" |
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|
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#### While Loop ends pipeline |
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seq 3 | while read i |
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do |
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echo ".$i" |
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done |
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## stdout-json: ".1\n.2\n.3\n" |
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|
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#### Redirect in Pipeline |
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echo hi 1>&2 | wc -l |
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## stdout: 0 |
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## BUG zsh stdout: 1 |
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|
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#### Pipeline comments |
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echo abcd | # input |
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# blank line |
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tr a-z A-Z # transform |
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## stdout: ABCD |
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|
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#### Exit code is last status |
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echo a | egrep '[0-9]+' |
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## status: 1 |
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|
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#### PIPESTATUS |
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return3() { |
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return 3 |
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} |
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{ sleep 0.03; exit 1; } | { sleep 0.02; exit 2; } | { sleep 0.01; return3; } |
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echo ${PIPESTATUS[@]} |
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## stdout: 1 2 3 |
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## N-I dash status: 2 |
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## N-I dash stdout-json: "" |
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## N-I zsh status: 0 |
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## N-I zsh stdout-json: "\n" |
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|
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#### PIPESTATUS with shopt -s lastpipe |
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shopt -s lastpipe |
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return3() { |
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return 3 |
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} |
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{ sleep 0.03; exit 1; } | { sleep 0.02; exit 2; } | { sleep 0.01; return3; } |
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echo ${PIPESTATUS[@]} |
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## stdout: 1 2 3 |
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## N-I dash status: 2 |
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## N-I dash stdout-json: "" |
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## N-I zsh status: 0 |
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## N-I zsh stdout-json: "\n" |
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|
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#### |& |
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stdout_stderr.py |& cat |
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## stdout-json: "STDERR\nSTDOUT\n" |
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## status: 0 |
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## N-I dash/mksh stdout-json: "" |
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## N-I dash status: 2 |
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|
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#### ! turns non-zero into zero |
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! $SH -c 'exit 42'; echo $? |
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## stdout: 0 |
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## status: 0 |
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|
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#### ! turns zero into 1 |
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! $SH -c 'exit 0'; echo $? |
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## stdout: 1 |
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## status: 0 |
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|
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#### ! in if |
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if ! echo hi; then |
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echo TRUE |
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else |
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echo FALSE |
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fi |
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## stdout-json: "hi\nFALSE\n" |
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## status: 0 |
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|
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#### ! with || |
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! echo hi || echo FAILED |
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## stdout-json: "hi\nFAILED\n" |
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## status: 0 |
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|
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#### ! with { } |
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! { echo 1; echo 2; } || echo FAILED |
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## stdout-json: "1\n2\nFAILED\n" |
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## status: 0 |
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|
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#### ! with ( ) |
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! ( echo 1; echo 2 ) || echo FAILED |
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## stdout-json: "1\n2\nFAILED\n" |
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## status: 0 |
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|
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#### ! is not a command |
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v='!' |
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$v echo hi |
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## status: 127 |
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|
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#### Evaluation of argv[0] in pipeline occurs in child |
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${cmd=echo} hi | wc -l |
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echo "cmd=$cmd" |
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## STDOUT: |
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1 |
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cmd= |
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## END |
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## BUG zsh STDOUT: |
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1 |
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cmd=echo |
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## END |
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|
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#### bash/dash/mksh run the last command is run in its own process |
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echo hi | read line |
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echo "line=$line" |
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## stdout: line=hi |
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## OK bash/dash/mksh stdout: line= |
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|
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#### shopt -s lastpipe (always on in OSH) |
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shopt -s lastpipe |
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echo hi | read line |
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echo "line=$line" |
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## stdout: line=hi |
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## N-I dash/mksh stdout: line= |
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|
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#### shopt -s lastpipe (always on in OSH) |
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shopt -s lastpipe |
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i=0 |
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seq 3 | while read line; do |
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(( i++ )) |
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done |
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echo i=$i |
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## stdout: i=3 |
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## N-I dash/mksh stdout: i=0 |
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