A shebang consists of a number sign and an exclamation point character (
#!), followed by the full path to the interpreter such as
/bin/bash. All scripts under UNIX and Linux execute using the interpreter specified on a first line.
Bash, Perl, PHP, Shell interpreters are not always in the same location such as
/usr/bin/perl. If you want to make sure that script is portable across different UNIX like operating system you need to use
env command allows to run a program in a modified environment.
# Find line #!/bin/bash # Replace with #!/usr/bin/env bash #!/usr/bin/env php #!/usr/bin/env perl