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105 lines
2.3 KiB
Markdown
105 lines
2.3 KiB
Markdown
getopts(1) -- Parse CLI options
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===============================
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## SYNOPSIS
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`getopts` [*options* ...]<br>
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`getopts` [*options* ...] `|` `while` read -l key value; ...; `end`<br>
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## DESCRIPTION
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`Getopts` is a command line parser implemented in `awk(1)`, designed to process command line arguments in the easiest way possible.
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## USAGE
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The best way to understand how `getopts` work is by studying a simple example.
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```
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getopts -ab1 --foo=bar baz
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```
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And its output.
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```
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a
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b 1
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foo bar
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_ baz
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```
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The items on the left represent the option flags or *keys* associated with the CLI. The items on the right are the option *values*. The underscore `_` character is the default *key* for arguments without a key.
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Use `read(1)` to process the generated stream and `switch(1)` to match patterns:
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```
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getopts -ab1 --foo=bar baz | while read -l key option
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switch $key
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case _
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case a
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case b
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case foo
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end
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end
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```
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## OPTIONS
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None.
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## EXAMPLES
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The following is a mock of `fish(1)` CLI missing the implementation:
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```
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function fish
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set -l mode
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set -l flags
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set -l commands
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set -l debug_level
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getopts $argv | while read -l key value
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switch $key
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case c command
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set commands $commands $value
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case d debug-level
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set debug_level $value
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case i interactive
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set mode $value
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case l login
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set mode $value
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case n no-execute
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set mode $value
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case p profile
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set flags $flags $value
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case h help
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printf "Usage: $_ [OPTIONS] [-c command] [FILE [ARGUMENTS...]]\n"
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return
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case \*
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printf "$_: '%s' is not a valid option.\n" $key
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return 1
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end
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end
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# Implementation
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end
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```
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## BUGS
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* getopts does *not* read the standard input. Use getopts to collect options and the standard input to process a stream of data relevant to your program.
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* A double dash, `--`, marks the end of options. Arguments after this sequence are placed in the default underscore key, `_`.
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* The getopts described in this document is *not* equivalent to the getopts *builtin* found in other shells.
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## AUTHORS
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Jorge Bucaran <j@bucaran.me>.
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