Commands tagged perl

A different approach to the problem - maintain a small sorted list, print the largest as we go, then the top 10 at the end. I often find that the find and sort take a long time, and the large file might appear near the start of the find. By printing as we go, I get better feedback. The sort used in this will be much slower on perls older than 5.8.

Here's a perl version that only considers printable characters. Change the regex /[[:print:]]/ to look for different sets of delimiter characters.

This is especially useful to get crazy stuff like space characters copied to your pasteboard correctly.

Source: https://github.com/mathiasbynens/dotfiles/blob/master/.functions

Removes special characters (colors) in '^]]Xm' and '^]]X;Ym' format from file.

Use pipe ('input | perl [...]') or stream ('perl [...]

You can use 'cat -v infile' as 'input' to show special characters instead of interpreting (there is problem with non-ASCII chars, they are replaced by M-[char]).

Better awk example, using only mplayer, grep, cut, and awk.

parse `lsmod' output and pass to `dot' drawing utility then finally pass it to an image viewer

You need to install WWW::Mechanize Perl module with

# cpan -i WWW::Mezchanize

or by searching mechanize | grep perl in your package manager

With this command, you can get forms, images, headers too

This will create a new file with proper code formatting and all comments removed.

convert a unix timestamp to a human readable format.

Lists all the modules that were installed the "proper way". It also uses Perl 5.10(or higher)'s say command for less typing.

This fixes a bug found in the other scripts which fail when a branch has the same name as a file or directory in the current directory.

dirrrty: use -p to chomp automatically, substitute all newlines away and then replace the "---" by a newline ? bingo!

s/// => s/// is just a cooler way to write s///, s/// which is just the small brother of s///; s/// (comma is an operator!)

have fun!

the output of svn log is annoying to grep, since it spreads the useful info over multiple lines. This compacts the output down to one line so eg you can grep for a comment and see the rev, date & committer straight away.

Updated: MUCH shorter, easier to remember. Now it just replaces newlines with spaces, except on '---' lines.

from http://stackoverflow.com/questions/1030787/multiline-search-replace-with-perl

added greedy trick in wildcard match (.*?) from

http://www.troubleshooters.com/codecorn/littperl/perlreg.htm#Greedy

say only processes a complete file, at eof, so following a file isn't possible. Quick and dirty perl oneliner to feed each line from the tail -f to say. Yes, expensive to lauch a new process each line.

This little ditty was prompted by a discussion on how horrible it is to use VoiceOver on ncurses programs such as irssi.

Find which directories on your system contain a lot of files.

Edit: much shorter and betterer with -n switch.

PmWiki stores wiki pages as Group.Name. Simply split the directory listing and count frequency of group occurances.

This uses wget instead of curl

Find all files in /var/spool/mqueue older than 7 days, pass to perl to efficiently delete them (faster than xargs or -exec when you've got millions or hundreds of thousands to delete). Naturally the type, directory, and file age vars can be adjusted to meet your specific needs.

Much better alternatives - grep-alikes using perl regexps. With more options, and nicer outputs.

If you've ever tried "grep -P" you know how terrible it is. Even the man page describes it as "highly experimental". This function will let you 'grep' pipes and files using Perl syntax for regular expressions.

The first argument is the pattern, e.g. '/foo/'. The second argument is a filename (optional).