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Commands tagged perl from sorted by
Terminal - Commands tagged perl - 164 results
sudo find / -type f | perl -MFile::Basename -ne '$counts{dirname($_)}++; END { foreach $d (sort keys %counts) {printf("%d\t%s\n",$counts{$d},$d);} }'|sort -rn | tee /tmp/sortedfilecount.out | head
2011-09-14 19:41:19
User: tamouse
Functions: find perl sort sudo tee
0

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

Edit: much shorter and betterer with -n switch.

cd /path/to/pmwiki/wiki.d;/bin/ls -1 | perl -ne 'my ($group,$name)=split(/\./);$counts{$group}++;' -e 'END { foreach $group (sort keys %counts) {printf("%d\t%s\n",$counts{$group},$group);} }'|sort -rn
2011-09-14 19:33:39
User: tamouse
Functions: cd perl sort
Tags: sort perl pmwiki
-2

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

route -n | perl -ne '$ANY="0.0.0.0"; /^$ANY/ and split /\s+/ and print "Gateway to the World: ",($_[1]!=$ANY)?$_[1]:(`ip address show $_[$#_]`=~/peer ([0-9\.]+)/ and $1),", via $_[$#_].\n"'
wget -q -O - http://www.perl.org/get.html | grep -m1 '\.tar\.gz' | sed 's/.*perl-//; s/\.tar\.gz.*//'
curl -s http://www.perl.org/get.html | grep -m1 '\.tar\.gz' | sed 's/.*perl-//; s/\.tar\.gz.*//'
find /var/spool/mqueue -type f -mtime +7 | perl -lne unlink
2011-08-19 15:22:02
User: mengesb
Functions: find perl
0

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.

ack; pcregrep
2011-08-14 18:01:36
User: depesz
Tags: perl grep regex
2

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

prep () { perl -nle 'print if '"$1"';' $2 }
2011-08-13 14:29:26
User: dbbolton
Functions: perl
Tags: perl grep regex
2

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).

cat subtitles.txt | perl -pe 's/} /}/g; s/{(\d+)}/=1=/; $f1=(24/25*$1); s/{(\d+)}/=2=/; $f2=(24/25*$1); $f1=~s/\..*//; $f2=~s/\..*//; s/=1=/{$f1}/; s/=2=/{$f2}/; ' > subtitles_newfps.txt
2011-07-30 15:34:43
User: ciekawy
Functions: cat perl
1

this command example converts to 25 fps subtitles that were originally created for 24 fps movie

lsof -nPi | txt2html > ~/lsof.html
2011-07-28 14:01:21
User: zlemini
Tags: perl cpan lsof
2

The output of lsof is piped to txt2html which converts it to html.

# Perl module HTML::TextToHTML needed

getent passwd $(whoami) | echo "$(perl -ne '/^([^:]+):[^:]+:[^:]+:[^:]+:([^ ]+) ?([^,]+)?,([^,]*),([^,]*),([^:,]*),?([^:,]*)/ and printf "MECARD:N:$3,$2;ADR:$5;TEL:$4;TEL:$6;EMAIL:$1@"')$HOSTNAME;;" | qrencode -o myqr.png
2011-07-25 12:59:57
User: Strawp
Functions: echo getent passwd
Tags: perl qr qrencode
0

If your contact information was entered when your user account was created (it gets added to /etc/passwd) then this gets that info and creates a QR code for you automatically

sort -R
2011-07-15 15:35:27
User: RyanM
Functions: sort
2

Randomizes a file. The opposite of sort is sort -R!

tail -f /var/log/squid/access.loc | ccze -CA
perl -mText::Highlight -E 'say Text::Highlight->new(ansi => 1)->highlight(Perl => do { local (@ARGV,$/) = shift; <> }) ' path/to/perl-file.pl
perl -ne 'print if m{\Q/*\E}x .. m{\Q*/\E}x or m{\/\/}x' *.c
2011-07-12 04:41:49
User: dbr
Functions: perl
0

more idiomatic version of the same, using the flip-flop-operator; also printing lines with '//'-style comments

perl -e 'my $in_comment = 0; while (<>) { $in_comment = 1 if m{\Q/*\E}; print if $in_comment; $in_comment = 0 if m{\Q*/\E}; }' *.cpp
2011-07-08 00:17:27
User: doherty
Functions: perl
1

This is a naive way of finding source code comments in source code files that use C-like comments: // and /*...*/

tail -f /var/log/squid/access.log | perl -p -e 's/^([0-9]*)/"[".localtime($1)."]"/e'
tail -f /var/log/logfile|perl -e 'while (<>) {$l++;if (time > $e) {$e=time;print "$l\n";$l=0}}'
2011-06-21 10:28:26
User: madsen
Functions: perl tail time
Tags: perl tail
2

Using tail to follow and standard perl to count and print the lps when lines are written to the logfile.

perl -MFile::Find -e"finddepth(sub{rmdir},'.')"
2011-05-23 08:45:34
User: igorfu
Functions: perl
Tags: perl delete
1

Recursively delete empty directories. Use with care.

rename 's/\d+/sprintf("%04d",$&)/e' *.jpg
2011-05-01 20:50:36
User: eightmillion
Functions: rename
11

This uses Perl's rename utility (you may have to call it as prename on your box) and won't choke on spaces or other characters in filenames. It will also zero pad a number even in filenames like "vacation-4.jpg".

perl -e 'rand($.) < 1 && ($line = $_) while <>;'
2011-04-25 21:28:26
Functions: perl
Tags: perl knuth
1

This is from perldoc -q random.*line, which says:

This has a significant advantage in space over reading the whole file in. You can find a proof of this method in The Art of Computer Programming, Volume 2, Section 3.4.2, by Donald E. Knuth.

Who am I to argue with Don Knuth?

perl -ple 'BEGIN { $\ = "\r\n" }'
2011-03-01 09:45:37
Functions: perl
Tags: perl newline
0

Let -p do it's voodoo and do absolutely nothing but set the output record separator :-)

perl -ne 'print if !$a{$_}++'
2011-02-17 02:18:44
User: doherty
Functions: perl
3

Reads stdin, and outputs each line only once - without sorting ahead of time. This does use more memory than your system's sort utility.

(echo foobar; echo farboo) | perl -E 'say[sort<>=~/./g]~~[sort<>=~/./g]?"anagram":"not anagram"'
2011-02-17 02:15:46
User: doherty
Functions: echo perl
2

This works by reading in two lines of input, turning each into a list of one-character matches that are sorted and compared.

perl -MText::Highlight -E '$h=Text::Highlight->new(ansi=>1); my $text=do{local $/; open my $fh, "<", $ARGV[0]; <$fh>}; say $h->highlight("Perl", $text);' path/to/perl-file.pl
2011-01-31 05:52:43
User: doherty
Functions: perl
1

This uses Text::Highlight to output the specified Perl file with syntax highlighting. A better alternative is my App::perlhl - find it on the CPAN: http://p3rl.org/App::perlhl