Environment Variables-linux command line and Shell script programming encyclopedia

Environment Variables Section:

1. View Global variables: printenv/env

2. Displays the value of a single environment variable: Echo as Echo $HOME

3. Display all environment variables set for a particular process: set

4. Setting global variables: Creating local environment variables--exporting to the global environment

Create local environment variables (use all lowercase to differentiate from system variables)

Test= ' Testing a long string '//environment variable name, equals, value no space between

Export to Global environment

Export test//Note exports do not use the $ symbol

View

Echo $test

Delete environment variables

unset test//Note here also does not use the $ symbol

5. Set the PATH environment variable

To view an existing path variable

Echo $PATH

Add a new application path

Path= $PATH:/home/user/test

View the added Path variable

Echo $PATH

Installation and management of soft package

1.aptitude for viewing installed packages

2. Find a specific package aptitude search Package_name

3. Installing aptitude Install Package_name

Environment Variables-linux command line and Shell script programming encyclopedia