This guide will show how to parse inputs inside variables in bash scripts.
Create a file named vartest and edit it in your favourite text editor:
$ touch vartest $ chmod +x vartest $ vi vartest
Step 2 #
If the input variable is an argument:
#!/bin/bash echo $1 $2 $3
Step 3 #
Now, if you run your script with 3 arguments, console will print them:
$ ./vartest apple car dog apple car dog
Step 4 #
Modify your script. Let it shows if running process exist:
#!/bin/bash ps aux | grep "$@" | grep -v "grep"
Step 5 #
Run your script with “bash” argument. Console should print somwething similar to this:
$ ./vartest bash user 18783 0.1 0.1 22704 5208 pts/0 Ss 20:03 0:00 -bash
Step 6 #
Modify your script again. Let it wait for your input from console:
#!/bin/bash echo "Hello, how should I call you?" read yourname echo "You've got very nice name, $yourname"
Step 7 #
Run your script without any arguments, and write your name:
$ ./vartest Hello, how should I call you? Joe You've got very nice name, Joe