export command within shell script

Question

When I use export command at command prompt, it works as expected. But it does not work from shell script.

[root@server shantanu]# export myip=10 [root@server shantanu]# echo $myip 10 [root@server shantanu]# vi myip.sh #!/bin/sh export myipadd=10 [root@server shantanu]# sh -xv myip.sh #!/bin/sh export myipadd=10 + export myipadd=10 + myipadd=10 [root@server shantanu]# echo $myipadd 

I want to make the variable available to the same script next time when it runs. In other words I am looking for some way to memorize the variable value.

Answer 1

Execute export command from the command line make the environment variables only take effect in the current session. Add it to your shell startup files for permanent.

For example, with bash:

echo "export myipadd=10" >> ~/.bash_profile (for only root) echo "export myipadd=10" >> /etc/profile (for all users) 

Answer 2

If you need to export your variable within a shell script and make it available to other scripts, you need to use the source command.

$ cat test.sh export MY_VAR="hello" $ source test.sh $ echo $MY_VAR hello