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Environment Variable

Environment variables make up the user environment

A setting that the OS or programs working in the OS access Environment variable
Changing environment variables from the defaults result in: user-defined-variable
The location of the bash executable file BASH
The user's login shell SHELL
The type of CPU CPU
Location where X Windows output goes DISPLAY
The location of the configuration file for the current shell ENV
The ID number of the current user EUID
The filename where past commands are stored HISTFILE
The number of past commands that HISTFILE stores for the current session HISTSIZE
The number of past commands that HISTFILE stores for multiple sessions HISTFILESIZE
The absolute path to the user's home directory HOME
The name of the computer HOST or HOSTNAME
The path to the computer's information pages INFODIR
The name of the current user LOGNAME
The path to the current user's mail box file MAIL
The path to the computer's man pages MANPATH
The path of the directory the user was in prior to the current path OLDPWD
The type of Operating System (Usually Linux) OSTYPE
The characters the shell uses to indicate normal user ($), root user (#) and similar terms PS1
The path to the current working directory PWD
The language the OS uses LANG
Used by the man command to specify the program in which to display man pages PAGER
The directory prefixes used to search for programs and files PATH
When adding entries to the PATH environment variable 1. Use a colon (:) to separate entries in the PATH variable 2. Do not include a period (.) in the PATH variable. A period indicates that the working directory is in the path, and this poses a security risk
View the variable's value echo ${variable Name} e.g. echo $SHELL
Display the values for environment variables applied to the child sessions env
Set shell environment variables. set
Remove an environment variable unset
Export a user-defined variable to make it available to the Child sessions export
Create a user-defined variable VARIABLE=value
A custom command that performs a specific actions An alias
Display the currently defined aliases on the system alias
Remove an alias unalias {alias_Name}
To make aliases persistent across reboots add them to: /etc/profile or ~/.bashrc
Created by: johnadream