PATH Definition in Linux

2019-9-14 07:33| 发布者: admin| 查看: 667| 评论: 0

摘要: PATH is an environment variable in Linux and other Unix-like operating system, responsible for searching executable files in pre-defined directory.For example: 'ls' command will execute 'ls' in the pa ...

PATH is an environment variable in Linux and other Unix-like operating system, responsible for searching executable files in pre-defined directory.

For example: 'ls' command will execute 'ls' in the path '/bin/ls'.

To see all your environmental variables, type:

> env

If you just want to show PATH in your environmental settings, type:

> env | grep PATH

or,

> echo $PATH

The dollar sign tells echo to repeat the value of the variable PATH rather than its name.

When a new system is installed, there are normally two users: a root and a ordinary public user.

The root user has more directory in PATH than ordinary user, for example, it has:

'/sbin' and '/usr/sbin' with the former storing system booting info and latter storing executable files.

To add path to PATH, use command,

> PATH="directory:$PATH" , or

> export PATH=$PATH:/usr/sbin

For example, to add '/usr/sbin' in the PATH, we do,

> PATH="/usr/sbin:$PATH"

To add it permanently, we need to specify that in '.bash_profile' existing in your home directory. To open it, use command,

> vi .bash_profile

Then you will see something like:

If you want to add a path '/usr/test' to PATH, change the third line to:

PATH=$PATH:$HOME/bin:/usr/test

REFERENCE:

1. http://www.linfo.org/path_env_var.html

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