Linux export to all users

Shell Export Variable To All Users Linux

The output lists all the variables used in the current shell session, and it is usually the same as running export without options.. 2. Using the -f option:. The -f option exports the variable names as functions. To export a name as a function, create a function in the command line with a unique name.

export [-f] [-n] [name[=value] . ] export -p export -p function print_msg < echo "Hello world" >print_msg export -f print_msg bash print_msg export -n EDITOR export | grep EDITOR x = 15 export x printenv x export EDITOR= /usr/bin/vim export | grep EDITOR export PS1='\[\e[1;32m\][\[email protected]\h \W]\$\[\e[0m\] ' export JAVA_HOME=/usr/share/java-x.x.x/ export | grep JAVA_HOME

Export Command in Linux Explained

The export command in Linux is used for creating environment variables. Understand how it works and how can you use export command for practical usage. it will become an environment variable and it will be available to all the subshells, users and shell scripts in this session. [email protected]: A good practice is to keep all the user

export myvar export myvar=5 echo $myvar [email protected]:~$ var=3 [email protected]:~$ echo $var 3 [email protected]:~$ su prakash Password: [email protected]:/home/abhishek$ echo $var [email protected]:/home/abhishek$ exit exit [email protected]:~$ echo $var 3 [email protected]:~$ export var [email protected]:~$ echo $var 3 [email protected]:~$ su prakash Password: [email protected]:/home/abhishek$ echo $var 3 printenv export PATH=/opt/maven/bin:$PATH [email protected]:~$ echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin [email protected]:~$ export PATH=/opt/maven/bin:$PATH [email protected]:~$ echo $PATH /opt/maven/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin export -n myvar unset myvar

Export an env variable to be available at all sub shells, and possible to

Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. It only takes a minute to sign up. (i.e. shell variables) from out of subshells. So that one could assign variables, say, inside of a pipeline – and the assignment would be transparently visible to the parent

export MY_VAR=0 echo $MY_VAR echo $MY_VAR $ export MY_VAR=200 $ bash $ echo $MY_VAR 200 set -U MY_VAR 0 fish -c "set -u MY_VAR 0"

Export command in Linux with Examples

Options of export command. 1. Without any argument : To view all the exported variables. EXAMPLE : 2. -p : To view all exported variables on current shell. SYNTAX : $ export -p. EXAMPLE : 3. -f: It must be used if the names refer to functions. If -f is not used, the export will assume the names are variables. SYNTAX : $ export -f function_name

export [-f] [-n] [name[=value] . ] or export -p $ export -p $ export -f function_name $ export name[=value] $ export -n variable_name

Источник

Where do I place commands to automatically be exported for all users?

I have an embedded platform running an Arago linux distribution. Right now the only «user» is root but there will eventually be others, but I don’t know how many or what user IDs they will have. Every user of this system must have a particular environment variable exported in order for the GUI to work correctly. I found that if I created and then added the export command to /home/root/.profile it is set correctly for root . Where should I place the command such that it is exported for every (current and future) user of the system? Note: On my system, at start up there were no files present in /home/root , I added .bash_profile but that didn’t work, then I added .profile and that did work. I thought I might have a dash shell because of that, but when I check /bin/sh it points to bash . so I tagged both.

@Eddy_Em — Thanks.. so /etc/bashrc doesn’t exist, but /etc/profile.d/ does. There’s a couple of shell scripts in there. I take it I just add another one that does an export and that will be autorun?

This isn’t an unambiguous way: user can delete needed lines from his ~/.bashrc . But you can replace bash by a script that will run bash with needed environment.

@terdon — That’s not a duplicate. That Question is how to get commands run for a specific user, which is why the Q and A’s are all talking about ~/.profile , that doesn’t solve my problem because I need this command done for all current and future users, which is why it needed to be done in the /etc/profile.d/ area

Источник

Export Command in Linux Explained

The export command in Linux is used for creating environment variables. Understand how it works and how you can use export command for practical usage.

The export command in Linux is used for creating environment variables. You can use it like this:

or a shorthand like this to assign it a value immediately:

You can see the value of exported variables with the echo command:

To make the changes permanent, you should add it to the ~/.bashrc file.

That was just the quick summary. Let’s see it in details to understand it better.

Understanding how export command works

In the example below, I declare a shell variable var and assign it a value 3. It’s a shell variable for now.

[email protected]:~$ var=3 [email protected]:~$ echo $var 3

If I exit the terminal and open a new terminal, this shell variable will disappear. If I want to use this variable in a shell script, it won’t work. Similarly, if I switch user (and thus initiating a new shell with this user), this shell variable won’t be available:

[email protected]:~$ su prakash Password: [email protected]:/home/abhishek$ echo $var 

Now, let’s go back to the previous user (and thus the previous shell where I declared the shell variable). You can see that the variable still exists here (because we didn’t terminate this shell session yet):

[email protected]:/home/abhishek$ exit exit [email protected]:~$ echo $var 3

So, now if I use the export command on the variable var here, it will become an environment variable and it will be available to all the subshells, users and shell scripts in this session.

[email protected]:~$ export var [email protected]:~$ echo $var 3 a[email protected]:~$ su prakash Password: [email protected]:/home/abhishek$ echo $var 3

You can check all the environment variables using the printenv command:

Make exported shell variables ‘permanent’ with bashrc file

But the struggle doesn’t end here. If you close the session, exit the terminal, log out or reboot your system, your environment variable will disappear again.

This is why it’s a common practice to add the export commands to the runtime configuration (rc) file of your shell.

Every shell has this rc file located in the user’s home directory which is used to determine variables and other configuration when the shell is started. As a user, you can use this rc file to customize your shell and its behavior.

If you are using bash shell, you should have a bashrc file at ~/.bashrc. You can either edit this file in a text editor like Vim or you can just append export var=3 (or whatever you are exporting) to this file.

Once done, you should use the source command to make the changes available immediately.

A good practice is to keep all the user defined environment variables at one place.

Why use export command?

One of the most common use of the export command is when you want to add something to the path so that your Linux system will find the certain command/executable file.

For example, if you installed maven and you want to be able to run it, you should add the directory location of maven executables to the path like this:

export PATH=/opt/maven/bin:$PATH

What does it do? It adds this directory location to the path. When you try to run a command in Linux, your system searches for its executable (usually in bin directory) in the directories mentioned in the PATH variable.

[email protected]:~$ echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin [email protected]:~$ export PATH=/opt/maven/bin:$PATH [email protected]:~$ echo $PATH /opt/maven/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

Bonus Tip: Remove a variable from exported list

Suppose you want to remove an ‘exported’ variable. You can use the negate option in this fashion:

Keep in mind that this will not reset the value of the variable. It will just turn the exported global variable into a local variable. It will continue to have the same value you had set earlier.

If you want to remove the variable from the exported list as well as remove its assigned value, use the unset option:

I hope you have a better idea of the export command in Linux now. If you have doubts, please feel free to ask in the comment section.

Источник

Set persistent environment variable for all users

$ lsb_release -a >> ubuntu 16.04.3 LTS $ uname -r >> 4.10.0-33-generic 

I have a python (3.5) script which calls environment variables via the os package. For the sake of simplicity, let’s use the following script, test_script.py:

import os MY_VAR = os.environ['MY_VAR'] print(MY_VAR) 

$ python test_script.py >> File "test-script.py", line 3, in >> MY_VAR = os.environ['MY_VAR'] >> File "/home/USER/anaconda3/lib/python3.6/os.py", line 669, in __getitem__ >> raise KeyError(key) from None >> KeyError: 'MY_VAR' 

ATTEMPT 1

$ MY_VAR=123 $ export MY_VAR $ echo $MY_VAR >> 123 $ python test_script.py >> 123 

$ python test_script.py >> File "test-script.py", line 3, in >> MY_VAR = os.environ['MY_VAR'] >> File "/home/USER/anaconda3/lib/python3.6/os.py", line 669, in __getitem__ >> raise KeyError(key) from None >> KeyError: 'MY_VAR' 

ATTEMPT 2

$ python test_script.py >> File "test-script.py", line 3, in >> MY_VAR = os.environ['MY_VAR'] >> File "/home/USER/anaconda3/lib/python3.6/os.py", line 669, in __getitem__ >> raise KeyError(key) from None >> KeyError: 'MY_VAR' 

ATTEMPT 3

$ python test_script.py >> File "test-script.py", line 3, in >> MY_VAR = os.environ['MY_VAR'] >> File "/home/USER/anaconda3/lib/python3.6/os.py", line 669, in __getitem__ >> raise KeyError(key) from None >> KeyError: 'MY_VAR' 

ATTEMPT 4

$ python test_script.py >> File "test-script.py", line 3, in >> MY_VAR = os.environ['MY_VAR'] >> File "/home/USER/anaconda3/lib/python3.6/os.py", line 669, in __getitem__ >> raise KeyError(key) from None >> KeyError: 'MY_VAR' 

ATTEMPT 5

$ python test_script.py >> File "test-script.py", line 3, in >> MY_VAR = os.environ['MY_VAR'] >> File "/home/USER/anaconda3/lib/python3.6/os.py", line 669, in __getitem__ >> raise KeyError(key) from None >> KeyError: 'MY_VAR' 

Источник