which
显示命令的全路径，即命令在哪里，which命令查找的范围是PATH环境变量的路径 -a 默认情况找到了就停止，-a会遍历所有路径，输出所有匹配项
~/Documents/vnote dev ● which ls
ls: aliased to ls --color=tty
~/Documents/vnote dev ● which -a ls
ls: aliased to ls --color=tty
/bin/ls
whereis
显示命令及其相关文件全路径 -b 查找可执行文件 -m 查找 man帮助文件 -s 查找源代码文件
~/Documents/vnote dev ● whereis ls
ls: /bin/ls /usr/share/man/man1/ls.1.gz
~/Documents/vnote dev ● whereis -b ls
ls: /bin/ls
~/Documents/vnote dev ● whereis -m ls
ls: /usr/share/man/man1/ls.1.gz
~/Documents/vnote dev ● whereis -s ls
ls:
