PATH is a computer noun, and its function is the search path for device executable files.
1. Only valid for files.
2. PATH=$PATH:
3． Format: PATH [drive letter 1] directory [path name 1] {[; drive letter 2:],
4. Instructions for use:
(1) When running an executable file, DOS will first search for the file in the current directory, and if it is found, run it; if the file cannot be found, it will be set according to the PATH command. Path, search for the file in the directory one by one;
(2) If there are more than two paths in the PATH command, separate each path with a semicolon ";";
(3) There are three ways to use the PATH command:
PATH [path 1]; [path 2];... (set the search path for executable files)
PATH; (Cancel all paths)
PATH (Show the path currently set)
Including %PATH% in the new path setting will append the old path to the new setting.
PATH under Linux:
$PATH: determines which directories the shell will search for commands or programs
Edit your PATH statement, the format is:
Add the specified path yourself, separated by colons. After the environment variable is changed, it will take effect when the user logs in next time. If you want to take effect immediately, you can execute the following statement: $ source .bash_profile
It should be noted that it is best not to change the current path to "./" Put it in PATH, which may expose you to unexpected attacks. Once completed, the current search path can be viewed via $ echo $PATH. After customizing in this way, you can avoid frequently starting programs that are outside the path searched by the shell.
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