How do I export a variable in bash shell?
Export Variables
- vech=Bus. Display the value of a variable with echo, enter:
- echo “$vech” Now, start a new shell instance, enter:
- bash. Now, display back the value of a variable vech with echo, enter:
- echo $vech.
- export backup=”/nas10/mysql” echo “Backup dir $backup” bash echo “Backup dir $backup”
- export -p.
What does export do in shell script?
Export is a built-in command of the Bash shell. It is used to mark variables and functions to be passed to child processes. Basically, a variable will be included in child process environments without affecting other environments.
How to export a variable in a shell?
Display the value of a variable with echo, enter: Now, start a new shell instance, enter: Now, display back the value of a variable vech with echo, enter: You will get an empty line as the variable vech is not exported to new process. To make the variable known to child processes, use the export command.
Why is it not possible to export from a shell script?
You can’t do an export through a shell script, because a shell script runs in a child shell process, and only children of the child shell would inherit the export. The reason for using source is to have the current shell execute the commands.
How does the export property work in Bash?
We also see how the variable B has not transferred to the subshell, as it was defined without using export. The export property is a specific property which can be turned on and off for a given variable. It is easily turned on by using the export command prefix when defining the variable. Once such a property is set, it remains active.
How to export a variable to the environment?
In order to export out the VAR variable first, the most logical and seemly working way is to source the variable: ./test-export.sh HELLO, VARIABLE — . The code: file test-export.sh