尝试修复which不存在的问题

[Mikachu2333]

问题描述

1. fix 某些 Linux 系统不存在 which 来检查命令的存在 #257

方案与实现

换用 command -v，这玩意应该是都有的

[github-actions]

Hi @Mikachu2333,

❤️ 感谢你的贡献！你的 PR 当前基于 main 分支，请修改使用 dev 分支

[Mikachu2333]

command命令是 POSIX 标准的一部分，所以其理应可用。

command - run a program

command [OPTIONS] [COMMANDNAME [ARG ...]]

DESCRIPTION
command  forces  the shell to execute the program COMMANDNAME and ignore any functions or builtins with
the same name.

The following options are available:

-a or --all
       Prints all COMMAND found in PATH, in the order found.

-q or --query
       Silence output and print nothing, setting only exit status.  Implies --search.  For  compatibil‐
       ity, this is also --quiet (deprecated).

-v (or -s or --search)
       Prints the external command that would be executed, or prints nothing if no file with the speci‐
       fied name could be found in PATH.

-h or --help
       Displays help about using this command.

With the -v option, command treats every argument as a separate command to look up and  sets  the  exit
status  to 0 if any of the specified commands were found, or 127 if no commands could be found. --quiet
used with -v prevents commands being printed, like type -q.

EXAMPLES
command ls executes the ls program, even if an ls function also exists.
command -s ls prints the path to the ls program.
command -q git; and command git log runs git log only if git exists.

[combinx]

[combinx]

[combinx]

在 debian 和 manjaro 均不是理想输出

[Mikachu2333]

在 debian 和 manjaro 均不是理想输出

恰恰相反，是理想输出，你后面不跟东西就是啥都没有啊，就好像你单独运行了 while 一样，用法是 command -v <你想查找的程序>，例如 command -v chsrc

[combinx]

我以为 -v 是 --version 的缩写，是我没认真了

[ccmywish]

这个方案很好 👍👍👍

把注释调整一下就行了