Question

8

Bash script file extension

rated 0 times [ 8] [ 0] / answers: 1 / hits: 1223 / 3 Years ago, sat, june 19, 2021, 4:54:16

I have a server where I have different kinds of scripts.

Those scripts are to be opened with different shells such as:

sh ./do_one_thing.sh

bash ./do_another_thing.sh

the .sh extension is dangerous to me especially if I have not connected to the server for a longer time. Or if someone unfamilliar needs to do a stand-in.

I might accidently execute sh ./do_another_thing.sh

Will it make any difference if I name my script do_another_thing.bash? This would create one more layer of foolproofness.

Additionally, I would like to know what the shebang line in the beginning is for other than a reminder to the Admin (#!/bin/bash) if it get's overwritten by sh ./do_another_thing.sh anyways. It seems to me such that there must be a more proper way of executing the script, recogniting the shebang.

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istmasted

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answered 3 Years ago ampolinhad · Accepted Answer

The shebang at the top of the file defines what interpreter is run when you run ./name_of_file (assuming it's executable).

#!/bin/cat

test 123

will simply print the above file when you run it with ./name_of_file, as it will run cat name_of_file.

#!/bin/echo

hello, world

will simply print name_of_file, because it runs echo name_of_file.

Setting that to bash or sh will allow you to choose what interpreter it runs with, as long as you remember to invoke it with ./name_of_file.

That being said, using .sh for sh, and .bash for bash works fine, albiet non-standard. File extensions are fairly fluid on linux.