To export a environment variable you run the export command while setting the variable. We can view a complete list of exported environment variables by running the export command without any arguments. To view all exported variables in the current shell you use the -p flag with export.
How do I view export variables in Linux?
Linux List All Environment Variables Command
- printenv command – Print all or part of environment.
- env command – Display all exported environment or run a program in a modified environment.
- set command – List the name and value of each shell variable.
How do I see environment variables in Linux?
Use echo $PATH to view your path variables. Use find / -name “filename” –type f print to find the full path to a file. Use export PATH=$PATH:/new/directory to add a new directory to the path.
How do I know where my environment variable is set?
On Windows
Select Start > All Programs > Accessories > Command Prompt. In the command window that opens, enter echo %VARIABLE%. Replace VARIABLE with the name of the environment variable you set earlier. For example, to check if MARI_CACHE is set, enter echo %MARI_CACHE%.
How do I see environment variables in terminal?
Launch Terminal or a shell. Enter echo $VARIABLE. Replace VARIABLE with the name of the environment variable. For example, to check if NUKE_DISK_CACHE is set, enter echo $NUKE_DISK_CACHE.
How do I find the export list in Linux?
To display all the exported environment variable of the current shell, execute the command with -p option as follows: export -p.
What is the display variable in Linux?
The DISPLAY variable is used by X11 to identify your display (and keyboard and mouse). Usually it’ll be :0 on a desktop PC, referring to the primary monitor, etc. If you’re using SSH with X forwarding ( ssh -X otherhost ), then it’ll be set to something like localhost:10.0 .
How do I find the PATH variable?
Select Start, select Control Panel. double click System, and select the Advanced tab. Click Environment Variables. In the section System Variables, find the PATH environment variable and select it.
How do I change the PATH variable in Linux?
Steps
- Change to your home directory. cd $HOME.
- Open the . bashrc file.
- Add the following line to the file. Replace the JDK directory with the name of your java installation directory. export PATH=/usr/java/<JDK Directory>/bin:$PATH.
- Save the file and exit. Use the source command to force Linux to reload the .
How do I check if a variable is set or not in Bash?
To find out if a bash variable is defined:
Determine if a bash variable is set or not : [[ ! -z ${PURGEIMAGE+z} ]] && echo “Set” || echo “Not defined” Return true if the variable is set on Bash version 4.2+ : [ -v $VAR ] && echo “Bash $VAR NOT set”
How do you set a variable in Bash?
The easiest way to set environment variables in Bash is to use the “export” keyword followed by the variable name, an equal sign and the value to be assigned to the environment variable.