带有 bash 的子命令
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Sub-commands with bash
提问by LavaScornedOven
Is it possible to implement sub-commands for bash scripts. I have something like this in mind:
是否可以为 bash 脚本实现子命令。我有这样的想法：
http://docs.python.org/dev/library/argparse.html#sub-commands
http://docs.python.org/dev/library/argparse.html#sub-commands
回答by rici
Here's a simple unsafe technique:
这是一个简单的不安全技术：
#!/bin/bash
clean() {
echo rm -fR .
echo Thanks to koola, I let you off this time,
echo but you really shouldn\'t run random code you download from the net.
}
help() {
echo Whatever you do, don\'t use clean
}
args() {
printf "%s" options:
while getopts a:b:c:d:e:f:g:h:i:j:k:l:m:n:o:p:q:r:s:t:u:v:w:x:y:z: OPTION "$@"; do
printf " -%s '%s'" $OPTION $OPTARG
done
shift $((OPTIND - 1))
printf "arg: '%s'" "$@"
echo
}
"$@"
That's all very cool, but it doesn't limit what a subcommand could be. So you might want to replace the last line with:
这一切都非常酷，但它并没有限制子命令可以是什么。因此，您可能希望将最后一行替换为：
if [[ =~ ^(clean|help|args)$ ]]; then
"$@"
else
echo "Invalid subcommand " >&2
exit 1
fi
Some systems let you put "global" options before the subcommand. You can put a getoptsloop before the subcommand execution if you want to. Remember to shiftbefore you fall into the subcommand execution; also, reset OPTINDto 1 so that the subcommands getopts doesn't get confused.
某些系统允许您在子命令之前放置“全局”选项。getopts如果需要，您可以在子命令执行之前放置一个循环。shift在陷入子命令执行之前，请记住；此外，重置OPTIND为 1 以便子命令 getopts 不会混淆。
