I am pretty new and I was wondering about this too. I asked the question on the chatterbox and this is the result.

[JobC]    I occasionally read the questions and answers posted on SOPW
+. Often I will see answers that show how to do something from a comma
+nd line. How can this then be converted to a script?
[shmem]    essentially you put the quoted text after -e into a file
[MidLifeXis]    Which platform?
[JobC]    Like this one: in file insert character in every row on nth 
+position
[JobC]    i am using strawberry perl on windows
[MidLifeXis]    There may be some nuances based on Windows/Unix(sh,ksh
+,csh,zsh)/VMS, and so on.
[MidLifeXis]    Is your environment set up to run .pl scripts on click
+?
[JobC]    I have never tried that. I am using cmd shell
[MidLifeXis]    If you do SET PATHEXT, is .pl in the provided list?
[shmem]    then you add a line # *perl * at the top and add switches a
+fter perl
[MidLifeXis]    perl -Mlib1 -Mlib2 -e 'foo(bar())'
[JobC]    nope .pl is not there.\
[shmem]    shmem fades out
[MidLifeXis]    Then just do as shmem is saying, and execute: perl scr
+iptname.pl
[MidLifeXis]    My example above would go into foo.pl as "use lib1;\nu
+se lib2\nfoo(bar());\n" (replace '\n' with a newline)
[JobC]    Ok, Thanks!
[MidLifeXis]    Recommendation: always (or at least until you know why
+ you shouldn't) use use strict; use warnings at the top of your scrip
+t.
[MidLifeXis]    Helps to catch very comment typos and mistakes.
[MidLifeXis]   *common, not comment
[download]

hopefully this helps you as much as it helped me