which [options] [--] programname [...]
shows the full path of (shell) commands 按$PATH查找可执行文件
内部命令不是可执行文件,所以找不到
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常用选项
-a:Print all matching executables in PATH, not just the first显示全部结果,默认第一项 -
示例
[xzt7566@centos7-test ~]$ which -a ll alias ll='ls -l --color=auto' /usr/bin/ls /bin/ls /usr/bin/which: no ll in (/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/xzt7566/.local/bin:/home/xzt7566/bin) [xzt7566@centos7-test ~]$ which ll alias ll='ls -l --color=auto' /usr/bin/ls
