82 lines
2.4 KiB
Plaintext
Executable File
82 lines
2.4 KiB
Plaintext
Executable File
# Simple usage cases for getopts.
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#
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# OPTIND is either not touched at all (first loop with getopts,
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# relying on shell startup init), or getopts state is reset
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# before new loop with "unset OPTIND", "OPTIND=1" or "OPTIND=0".
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#
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# Each option is a separate argument (no "-abc"). This conceptually
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# needs only $OPTIND to hold getopts state.
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#
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# We check that loop does not stop on unknown option (sets "?"),
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# stops on _first_ non-option argument.
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(
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echo "*** no OPTIND, optstring:'ab' args:-a -b c"
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var=QWERTY
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while getopts "ab" var -a -b c; do
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echo "var:'$var' OPTIND:$OPTIND"
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done
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# unfortunately, "rc:0" is shown since while's overall exitcode is "success"
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echo "exited: rc:$? var:'$var' OPTIND:$OPTIND"
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# Resetting behavior =1
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echo "*** OPTIND=1, optstring:'ab' args:-a -b c"
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OPTIND=1
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while getopts "ab" var -a -b c; do
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echo "var:'$var' OPTIND:$OPTIND"
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done
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echo "exited: rc:$? var:'$var' OPTIND:$OPTIND"
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# Resetting behavior =0
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echo "*** OPTIND=0, optstring:'ab' args:-a -b c"
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OPTIND=0
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while getopts "ab" var -a -b c; do
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echo "var:'$var' OPTIND:$OPTIND"
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done
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echo "exited: rc:$? var:'$var' OPTIND:$OPTIND"
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# Resetting behavior "unset"
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echo "*** unset OPTIND, optstring:'ab' args:-a -b c"
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unset OPTIND
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while getopts "ab" var -a -b c; do
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echo "var:'$var' OPTIND:$OPTIND"
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done
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echo "exited: rc:$? var:'$var' OPTIND:$OPTIND"
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# What is the final exitcode?
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echo "*** optstring:'ab' args:-a -b c"
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unset OPTIND
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getopts "ab" var -a -b c; echo "1 rc:$? var:'$var' OPTIND:$OPTIND"
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getopts "ab" var -a -b c; echo "2 rc:$? var:'$var' OPTIND:$OPTIND"
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getopts "ab" var -a -b c; echo "3 rc:$? var:'$var' OPTIND:$OPTIND"
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# Where would it stop? c or -c?
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echo "*** unset OPTIND, optstring:'ab' args:-a c -c -b d"
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unset OPTIND
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while getopts "ab" var -a c -c -b d; do
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echo "var:'$var' OPTIND:$OPTIND"
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done
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echo "exited: rc:$? var:'$var' OPTIND:$OPTIND"
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# What happens on unknown option?
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echo "*** unset OPTIND, optstring:'ab' args:-a -c -b d"
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unset OPTIND
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while getopts "ab" var -a -c -b d; do
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echo "var:'$var' OPTIND:$OPTIND"
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done
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echo "exited: rc:$? var:'$var' OPTIND:$OPTIND"
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# ORTERR=0 suppresses error message?
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echo "*** unset OPTIND, OPTERR=0, optstring:'ab' args:-a -c -b d"
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unset OPTIND
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OPTERR=0
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while getopts "ab" var -a -c -b d; do
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echo "var:'$var' OPTIND:$OPTIND"
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done
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echo "exited: rc:$? var:'$var' OPTIND:$OPTIND"
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) 2>&1 \
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| sed -e 's/ unrecognized option: / invalid option -- /' \
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-e 's/ illegal option -- / invalid option -- /' \
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