What does this command actually do? 1

[grindel]

Trying to figger what this actually does, but not having much luck. So, I'll toss it out to you experts:

perl -i~ -nle 'print unless /<(built-in|command line)>/' makefile x2p/makefile

TIA
Rick

 

[arn0ld]

is this about the command switches? if so:
man perlrun

 

[Coderifous]

True, you must read the perldocs to truly grasp the power of the command line switches. Perl is a beast when it comes to text file molesting.

Basically your one-liner there is doing an inline edit on a file (inline means it makes a backup of the original file, and then creates a new file in it's place, the new file's content being the output from the one-liner, which in this case will print out every line of the original file MINUS the lines that match the regex. The regex will match lines containing "<built-in>" or "<command line>".

The one-liner is expecting to molest two separate files: 'makefile', and 'x2p/makefile'.

And if I may advise: You don't need the 'l', it adds newlines to the end of print statements, which you should already be present since you are iterating over each line via the 'n' switch.

Hope this hiznelps.

--jim

 

[arcnon]

Coderifous,

you are the man.

 

[Coderifous]

Thanks for the ego-boost arcnon.

"There are two things I promise: one... I will always look this good, and two... I will always be there for you"

That is the only worthwhile quote from hellboy, which otherwise was a cinematic abortion.

--jim