本文详细解释了Linux系统中关键目录的用途：/bin存放系统安装的所有用户命令；/sbin存放系统安装的所有超级用户命令；/usr/bin存放应用程序的用户命令；/usr/sbin存放应用程序的超级用户命令。
bin,/sbin,/usr/bin/,/usr/sbin的划分标准是什么？
/ : this is root directory
/bin : commands in this dir are all system installed user commands
/sbin: commands in this dir are all system installed super user commands
/usr/bin: user commands for applications
/usr/sbin: super user commands for applications
/usr/X11R6/bin : X application user commands
/usr/X11R6/sbin: X application super user commands
normally you can't execute super user command like visudoer, /usr/local/sbin/apachectr, etc when you using a user login.
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