What is "#!' in a script file? [duplicate]
$cat shebang.sed
#! /bin/sed -f
s/red/xxx/
s/BLUE/1234/
$./shebang.sed rgb
lower (#1): "xxx green blue"
UPPER (#2): "RED GREEN 1234"
$sed -f shebang.sed rgb
lower (#1): "xxx green blue"
UPPER (#2): "RED GREEN 1234"
I may guess what #! is doing. However, I don't say I know it. what is "#!"?
Solution 1:
This line is called shebang and is used to tell the terminal which interpreter to use when executing the script. In your case, you use sed
Other examples would be:
#!/bin/bash # -> uses bash
#!/usr/bin/perl # -> uses perl
#!/usr/bin/env python # -> uses python