Commands by depesz

Commands by depesz (36)

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FizzBuzz One-liner
This is sample output - yours may be different.
2

perl -le 'print$_%3?$_%5?$_:"Buzz":$_%5?"Fizz":"FizzBuzz"for 1..100'

depesz · 2012-01-10 13:10:30 6
Use Perl like grep

Much better alternatives - grep-alikes using perl regexps. With more options, and nicer outputs.
This is sample output - yours may be different.
1

ack; pcregrep

depesz · 2011-08-14 18:01:36 4
Chmod all directories (excluding files)

+ at the end means that many filenames will be passed to every chmod call, thus making it faster. And find own {} makes sure that it will work with spaces and other characters in filenames.
This is sample output - yours may be different.
7

find public_html/ -type d -exec chmod 755 {} +

depesz · 2011-07-25 15:25:36 6
Find Out My Linux Distribution Name and Version
This is sample output - yours may be different.
2

lsb_release -ri

depesz · 2011-06-22 14:03:53 8
Recursively remove all '.java.orig' directories (scalable)
This is sample output - yours may be different.
-2

find . -depth $ -path '*/*.java.orig' -o -path '*/*.java.orig/*' $ -delete

depesz · 2011-05-18 16:40:41 4
Show seconds since modified of newest modified file in directory
This is sample output - yours may be different.
-1

echo $(( $( date +%s ) - $( stat -c %Y * | sort -nr | head -n 1 ) ))

depesz · 2011-05-12 14:29:45 4
shutdown pc in a 4 hours

Benefit is that it doesn't make you keep the terminal open.
This is sample output - yours may be different.
-2

echo "shutdown -h now" | sudo at now + 4 hours

depesz · 2011-05-02 15:29:48 4
Extract 2 copies of .tar.gz content

Sometimes you might need to have two copies of data that is in tar. You might unpack, and then copy, but if IO is slow, you might lower it by automatically writing it twice (or more times)
This is sample output - yours may be different.
-1

mkdir copy{1,2}; gzip -dc file.tar.gz | tee >( tar x -C copy1/ ) | tar x -C copy2/

depesz · 2011-04-14 17:02:05 6
BASH: Print shell variable into AWK

Alternatively: export MyVAR=84; awk '{ print ENVIRON["MyVAR"] }'
This is sample output - yours may be different.
3

MyVAR=85 awk '{ print ENVIRON["MyVAR"] }'

depesz · 2011-04-14 16:46:23 4
grep 'hoge' **/* => Argument list too long
This is sample output - yours may be different.
-4

ack hoge .

depesz · 2011-04-12 17:40:15 4
grep 'hoge' **/* => Argument list too long
This is sample output - yours may be different.
-4

grep -r hoge .

depesz · 2011-04-12 17:39:52 3
find files ignoring .svn and its decendents
This is sample output - yours may be different.
1

find . -type d -name .svn -prune -o -type f -print0 | xargs -r0 ...

depesz · 2011-03-21 21:36:57 5
easily strace all your apache processes
This is sample output - yours may be different.
-1

ps -C apache o pid= | sed 's/^/-p /' | xargs strace

depesz · 2011-03-15 08:46:33 4
Print sorted list of all installed packages (Debian)
This is sample output - yours may be different.
-2

dpkg --get-selections | awk '$2=="install" {print $1}' | sort

depesz · 2011-03-15 08:39:26 5
List 50 largest source files in a project

Will work with filenames with spaces inside. Will not break in case of someone making directory that matches *.pm. And sorts from largest. Where largest is file size, not line count.
This is sample output - yours may be different.
0

find . -type f -name '*.pm' -printf '%6s %p\n' | sort -nr | head -n 50

depesz · 2011-02-09 16:19:11 18
Figure out what shell you're running

First version was "ps uw -p $$", but current "ps -o comm= -p $$" just gives shell name
This is sample output - yours may be different.
0

ps -o comm= -p $$

depesz · 2011-02-05 11:54:42 4
Random IPv4 address
This is sample output - yours may be different.
1

perl -le '$,=".";print map int rand 256,1..4'

depesz · 2011-01-16 16:57:19 5
Perl One Liner to Generate a Random IP Address
This is sample output - yours may be different.
0

perl -le '$,=".";print map int rand 256,1..4'

depesz · 2011-01-16 16:56:44 4
Unix timestamp Solaris
This is sample output - yours may be different.
0

perl -le 'print time()'

depesz · 2011-01-12 16:45:23 4
Find the biggest files
This is sample output - yours may be different.
-1

find -type f -exec du -sh {} + | sort -rh | head

depesz · 2011-01-04 11:38:29 6
Find Files over 20Meg

Output made so that it will match initial suggestion for this task. Personally, I think that output of du -h is more readable.
This is sample output - yours may be different.
0

find . -type f -size +20000k -print0 | xargs -0 du -h | awk -F"\t" '{printf "%s : %s\n", $2, $1}'

depesz · 2010-12-15 17:51:09 4
Remove duplicate rows of an un-sorted file based on a single column

F[0] filters using first word. $F[1] - 2nd, and so on.
This is sample output - yours may be different.
3

perl -ane 'print unless $x{$F[0]}++' infile > outfile

depesz · 2010-12-15 17:46:22 4
Remove all .svn folders
This is sample output - yours may be different.
0

shopt -s globstar; rm -rfv **/.svn

depesz · 2010-12-15 09:36:43 4
find an unused unprivileged TCP port

perl-less way
This is sample output - yours may be different.
3

(netstat -atn | awk '{printf "%s\n%s\n", $4, $4}' | grep -oE '[0-9]*$'; seq 32768 61000) | sort -n | uniq -u | head -n 1

depesz · 2010-12-15 09:27:59 4
find an unused unprivileged TCP port

perl-based version
This is sample output - yours may be different.
0

netstat -atn | perl -ane 'if ( $F[3] =~ /(\d+)$/ ) { $x{$1}=1 } END{ print( (grep {!$x{$_}} 32768..61000)[0] . "\n" )}'

depesz · 2010-12-15 09:25:52 5
1 2 >

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List your installed Firefox extensions

Find C/C++ source files

Find C/C++ source files and headers in the current directory.

list files recursively by size

View ~/.ssh/known_hosts key information

Will return the SSH server key information for each host you have in your ~/.ssh/known_hosts file, including key size, key fingerprint, key IP address or domain name, and key type.

List out classes in of all htmls in directory

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box) WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

Automator Bash script to create Clean zips in MacOS Finder without __MACOSX metadata

Finder compresses to ZIP but always includes extraneous metadata files (__MACOSX and .DS_Store) files and folders that may confuse other programs. One alternative is creating them and then editing the ZIP. This can work standalone or in an automator script accepting multiple selections (files or folders) and creating one zip per argument/selected file without that metada.

convert single digit to double digits

Uses 'rename' to pad zeros in front of first existing number in each filename. The "--" is not required, but it will prevent errors on filenames which start with "-". You can change the "2d" to any number you want, equaling the total numeric output: aka, 4d = ????, 8d = ????????, etc. I setup a handful of handy functions to this effect (because I couldn't figure out how to insert a var for the value) in the form of 'padnum?', such as: padnum5 () { /usr/bin/rename 's/\d+/sprintf("%05d",$&)/e' -- $@ } Which would change a file "foo-1.txt" to "foo-00001.txt"

fast access to any of your favorite directory.

example: -------------------------------------------------------------------------------------------- user@ubuntu:~/workspace/SVN/haystak-repos/trunk/internal/src$ addpi -------------------------------------------------------------------------------------------- Now that directory is in the list of fast access directories. You can switch to it anytime like this: -------------------------------------------------------------------------------------------- user@ubuntu:~$ pi internal` user@ubuntu:~/workspace/SVN/haystak-repos/trunk/internal/src$ -------------------------------------------------------------------------------------------- Please note the backquote ( the symbol that shares its key with ~ in the keyboard ) pi will switch you to that directory. To see the list of all fast access directories you have to say "cat ~/.pi"

List recorded formular fields of Firefox

When you fill a formular with Firefox, you see things you entered in previous formulars with same field names. This command list everything Firefox has registered. Using a "delete from", you can remove anoying Google queries, for example ;-)

Generate diff of first 500 lines of two files

Useful for massive files where doing a full diff would take too long. This just runs diff on the first 500 lines of each. The use of subshells to feed STDIN is quite a useful construct.

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