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35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
---
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syntax: markdown
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tags: [tldr, common]
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source: https://github.com/tldr-pages/tldr.git
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---
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# getopts
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> Parse shell options from arguments.
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> Note: This command does not support longform options and thus using `getopt` is recommended instead.
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> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-getopts>.
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- Check if an option is the first set option in the current context:
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`getopts {{x}} {{opt}}; echo ${{opt}}`
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- Check if an option is set in a string (specified option must be the first element of the string):
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`getopts {{x}} {{opt}} "{{string text}}"; echo ${{opt}}`
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- Set an option to require an argument and print them:
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`getopts {{x}}: {{opt}}; echo ${{opt}} $OPTARG`
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- Check for multiple options:
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`while getopts {{xyz}} {{opt}}; do case ${{opt}} in x) {{echo x is set}};; y) {{echo y is set}};; z) {{echo z is set}};; esac; done`
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- Set `getopts` to silent mode and handle option errors:
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`while getopts :{{x:}} {{opt}}; do case ${{opt}} in x) ;; :) {{echo "Argument required"}};; ?) {{echo "Invalid argument"}} esac;; done`
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- Reset `getopts`:
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`OPTIND=1`
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