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#!/bin/bash |
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# |
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# Bash implements type -t. |
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# |
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# NOTE: Aliases don't work in batch mode! Interactive only. |
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|
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#### getopts empty |
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set -- |
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getopts 'a:' opt |
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echo "status=$? opt=$opt OPTARG=$OPTARG" |
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## stdout: status=1 opt=? OPTARG= |
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|
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#### getopts sees unknown arg |
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set -- -Z |
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getopts 'a:' opt |
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echo "status=$? opt=$opt OPTARG=$OPTARG" |
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## stdout: status=0 opt=? OPTARG= |
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|
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#### getopts three invocations |
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set -- -h -c foo |
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getopts 'hc:' opt |
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echo status=$? opt=$opt |
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getopts 'hc:' opt |
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echo status=$? opt=$opt |
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getopts 'hc:' opt |
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echo status=$? opt=$opt |
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## stdout-json: "status=0 opt=h\nstatus=0 opt=c\nstatus=1 opt=?\n" |
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|
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#### getopts resets OPTARG |
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set -- -c foo -h |
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getopts 'hc:' opt |
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echo status=$? opt=$opt OPTARG=$OPTARG |
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getopts 'hc:' opt |
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echo status=$? opt=$opt OPTARG=$OPTARG |
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## stdout-json: "status=0 opt=c OPTARG=foo\nstatus=0 opt=h OPTARG=\n" |
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|
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#### Basic getopts invocation |
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set -- -h -c foo x y z |
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FLAG_h=0 |
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FLAG_c='' |
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while getopts "hc:" opt; do |
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case $opt in |
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h) FLAG_h=1 ;; |
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c) FLAG_c="$OPTARG" ;; |
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esac |
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done |
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shift $(( OPTIND - 1 )) |
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echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@ |
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## stdout: h=1 c=foo optind=4 argv=x y z |
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|
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#### getopts with invalid flag |
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set -- -h -x |
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while getopts "hc:" opt; do |
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case $opt in |
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h) FLAG_h=1 ;; |
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c) FLAG_c="$OPTARG" ;; |
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'?') echo ERROR $OPTIND; exit 2; ;; |
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esac |
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done |
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echo status=$? |
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## stdout: ERROR 3 |
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## status: 2 |
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|
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#### getopts missing required argument |
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set -- -h -c |
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while getopts "hc:" opt; do |
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case $opt in |
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h) FLAG_h=1 ;; |
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c) FLAG_c="$OPTARG" ;; |
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'?') echo ERROR $OPTIND; exit 2; ;; |
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esac |
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done |
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echo status=$? |
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## stdout: ERROR 3 |
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## status: 2 |
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|
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#### getopts doesn't look for flags after args |
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set -- x -h -c y |
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FLAG_h=0 |
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FLAG_c='' |
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while getopts "hc:" opt; do |
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case $opt in |
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h) FLAG_h=1 ;; |
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c) FLAG_c="$OPTARG" ;; |
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esac |
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done |
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shift $(( OPTIND - 1 )) |
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echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@ |
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## stdout: h=0 c= optind=1 argv=x -h -c y |
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|
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#### getopts with explicit args |
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# NOTE: Alpine doesn't appear to use this, but bash-completion does. |
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FLAG_h=0 |
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FLAG_c='' |
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arg='' |
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set -- A B C |
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while getopts "hc:" opt -h -c foo x y z; do |
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case $opt in |
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h) FLAG_h=1 ;; |
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c) FLAG_c="$OPTARG" ;; |
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esac |
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done |
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echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@ |
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## STDOUT: |
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h=1 c=foo optind=4 argv=A B C |
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## END |
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|
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#### OPTIND |
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echo $OPTIND |
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## stdout: 1 |
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|
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#### OPTIND after multiple getopts with same spec |
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while getopts "hc:" opt; do |
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echo '-' |
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done |
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echo $OPTIND |
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|
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set -- -h -c foo x y z |
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while getopts "hc:" opt; do |
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echo '-' |
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done |
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echo $OPTIND |
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|
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set -- |
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while getopts "hc:" opt; do |
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echo '-' |
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done |
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echo $OPTIND |
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## stdout-json: "1\n-\n-\n4\n1\n" |
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## BUG mksh/osh stdout-json: "1\n-\n-\n4\n4\n" |
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|
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#### OPTIND after multiple getopts with different spec |
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# Wow this is poorly specified! A fundamental design problem with the global |
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# variable OPTIND. |
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set -- -a |
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while getopts "ab:" opt; do |
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echo '.' |
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done |
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echo $OPTIND |
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|
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set -- -c -d -e foo |
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while getopts "cde:" opt; do |
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echo '-' |
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done |
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echo $OPTIND |
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|
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set -- -f |
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while getopts "f:" opt; do |
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echo '_' |
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done |
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echo $OPTIND |
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## stdout-json: ".\n2\n-\n-\n5\n2\n" |
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## BUG ash/dash stdout-json: ".\n2\n-\n-\n-\n5\n_\n2\n" |
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## BUG mksh/osh stdout-json: ".\n2\n-\n-\n5\n5\n" |
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|
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#### OPTIND narrowed down |
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FLAG_a= |
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FLAG_b= |
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FLAG_c= |
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FLAG_d= |
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FLAG_e= |
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set -- -a |
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while getopts "ab:" opt; do |
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case $opt in |
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a) FLAG_a=1 ;; |
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b) FLAG_b="$OPTARG" ;; |
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esac |
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done |
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# Bash doesn't reset optind! It skips over c! mksh at least warns about this! |
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# You have to reset OPTIND yourself. |
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|
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set -- -c -d -e E |
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while getopts "cde:" opt; do |
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case $opt in |
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c) FLAG_c=1 ;; |
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d) FLAG_d=1 ;; |
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e) FLAG_e="$OPTARG" ;; |
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esac |
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done |
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|
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echo a=$FLAG_a b=$FLAG_b c=$FLAG_c d=$FLAG_d e=$FLAG_e |
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## stdout: a=1 b= c=1 d=1 e=E |
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## BUG bash/mksh/osh stdout: a=1 b= c= d=1 e=E |
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|
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|
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#### Getopts parses the function's arguments |
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FLAG_h=0 |
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FLAG_c='' |
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myfunc() { |
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while getopts "hc:" opt; do |
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case $opt in |
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h) FLAG_h=1 ;; |
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c) FLAG_c="$OPTARG" ;; |
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esac |
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done |
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} |
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set -- -h -c foo x y z |
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myfunc -c bar |
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echo h=$FLAG_h c=$FLAG_c opt=$opt optind=$OPTIND argv=$@ |
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## stdout: h=0 c=bar opt=? optind=3 argv=-h -c foo x y z |
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|
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#### Local OPTIND |
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# minimal test case extracted from bash-completion |
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min() { |
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local OPTIND=1 |
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|
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while getopts "n:e:o:i:s" flag "$@"; do |
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echo "loop $OPTIND"; |
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done |
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} |
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min -s |
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## stdout: loop 2 |
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