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87 lines
2 KiB
Markdown
87 lines
2 KiB
Markdown
*Jump to [source](pacman.rs)*
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[`pacman`](https://wiki.archlinux.org/index.php/pacman) defines subcommands via flags.
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Here, `-S` is a short flag subcommand:
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```console
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$ pacman -S package
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Installing package...
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```
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Here `--sync` is a long flag subcommand:
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```console
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$ pacman --sync package
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Installing package...
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```
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Now the short flag subcommand (`-S`) with a long flag:
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```console
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$ pacman -S --search name
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Searching for name...
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```
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And the various forms of short flags that work:
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```console
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$ pacman -S -s name
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Searching for name...
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$ pacman -Ss name
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Searching for name...
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```
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*(users can "stack" short subcommands with short flags or with other short flag subcommands)*
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In the help, this looks like:
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```console
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$ pacman -h
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pacman 5.2.1
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Pacman Development Team
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package manager utility
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USAGE:
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pacman[EXE] <SUBCOMMAND>
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OPTIONS:
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-h, --help Print help information
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-V, --version Print version information
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SUBCOMMANDS:
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help Print this message or the help of the given subcommand(s)
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query -Q --query Query the package database.
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sync -S --sync Synchronize packages.
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$ pacman -S -h
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pacman[EXE]-sync
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Synchronize packages.
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USAGE:
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pacman[EXE] {sync|--sync|-S} [OPTIONS] [--] [package]...
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ARGS:
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<package>... packages
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OPTIONS:
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-h, --help Print help information
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-i, --info view package information
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-s, --search <search>... search remote repositories for matching strings
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```
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And errors:
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```console
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$ pacman -S -s foo -i bar
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? failed
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error: The argument '--search <search>...' cannot be used with '--info'
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USAGE:
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pacman[EXE] {sync|--sync|-S} --search <search>... <package>...
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For more information try --help
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```
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**NOTE:** Keep in mind that subcommands, flags, and long flags are *case sensitive*: `-Q` and `-q` are different flags/subcommands. For example, you can have both `-Q` subcommand and `-q` flag, and they will be properly disambiguated.
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Let's make a quick program to illustrate.
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