Environment Variable PATH

Environment Variable PATH-general Linux technology-Linux technology and application information. For more information, see the following section. I have doubts. Since there are absolute and relative paths, why can I execute the/bin/ls file under/root?

This is the role of the environment variable PATH.

When we execute a command, the system will search for files in each PATH defined by PATH according to the PATH settings. The command file first searched will be executed first.

Input echo $ PATH. echo indicates display and printing. $ in front of PATH indicates that the variable is followed, so the PATH is displayed.

[Root @ localhost ~] # Echo $ PATH
/Usr/lib/qt-3.3/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin: /usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin:/usr/share/jre/bin: /root/bin

Check that/bin can find ls In PATH settings.