To create a shell script, simply put bash commands into a file as you would type them. To run the script, you have three choices:
#!/bin/bash
and make
the file executable
This is the most common way to run scripts. Add the line:
#!/bin/bash
to the very top of the script file. It must be the first line of the file, left-justified. Then make the file executable:
$ chmod +x myscript
Optionally, move it into a directory in your search path. Then run it like any other command:
$ myscript
If the script is in your current directory, but the current directory “.” is not in your search path, you’ll need to prepend “./” so the shell finds the script:
$ ./myscript
The current directory is generally not in your search path
for security reasons. (You wouldn’t want a local script named
(say) “ls” to override the real ls
command.)
bash will interpret its argument as the name of a script and run it.
$ bash myscript
source
The preceding methods run your script as an independent
entity that has no effect on your current shell.[22] If you want your script to make changes to your
current shell (setting variables, changing directory, and so
on), it can be run in the current shell with the
source
or “.” command:
$ . myscript $ source myscript
[22] That’s because the script runs in a separate shell (a subshell or child shell) that cannot alter the original shell.
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