How do I see a list of all exported variables and functions under Unix bash shell?
The export command makes your local variables global. The syntax is as follows:
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export PATH=$PATH:/usr/local/bin:~/bin export EDITOR=/usr/local/bin/vim export SHELL=/bin/ksh export LANG=En_US export PAGER=/usr/local/bin/most |
To make your local shell variables global automatically, export them in your ~/.profile or ~/.bash_profile file under Unix like operating systems. To see a list of all exported variables and functions pass the -p option to the export command:
export -p export -p | grep something export -p | less export -p | more |
Sample outputs:
DISPLAY=unix:0 EDITOR=vim HISTFILE=/home/vivek/.bash_history HISTSIZE=1000 HOME=/home/vivek LANG=En_IN LOGNAME=vivek MAIL=/usr/mail/vivek MAILCHECK=0 PWD=/home/vivek SHELL=/bin/bash
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‘set’ will display all defined variables and functions in your current session.
Can i use that for setting JAVA_HOME at bash profile ? How to make it permanent ?
There’s also `env`, or `env | sort` if one desires sorted output as per export -p.
@Antonius: Yes, of course you can. Add the following lines:
export JAVA_HOME=/path/to/your/java/installation
export PATH=JAVA_HOME/bin:$PATH
to ~/.bash_profile (or ~/.bashrc) and you’re done! :)
undo an export
a parameter was exported to the current shell.
I use a few different scripts that follow using that exported parameter
Now I want to remove that exported variable.
Aside from logging out, is the only way to remove it to set it to a null string?
Try unset command:
unset VAR_NAME
For example: