Linux下/bin, /sbin, /usr/bin, /usr/sbin 等的区别

/  : 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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