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Numerically sorted human readable disk usage

Provides numerically sorted human readable du output. I so wish there was just a du flag for this. Show Sample Output
This is sample output - yours may be different.
```
# du -x --max-depth=1 /var | sort -n | awk '{ print $2 }' | xargs du -hx --max-depth=0
0       /var/lock
128K    /var/run
4.0K    /var/crash
4.0K    /var/games
4.0K    /var/local
4.0K    /var/opt
4.0K    /var/tmp
8.0K    /var/mail
692K    /var/spool
7.2M    /var/backups
13M     /var/log
97M     /var/www
236M    /var/lib
539M    /var/cache
891M    /var
```
4

du -x --max-depth=1 | sort -n | awk '{ print $2 }' | xargs du -hx --max-depth=0

d34dh0r53 · 2010-02-18 19:46:47 6
Speed up upgrades for a debian/ubuntu based system.

Please install aria2c before you try the above command. On ubuntu the command to install aria2c would be: sudo aptitude install aria2
This is sample output - yours may be different.
3

sudo aptitude update; sudo apt-get -y --print-uris upgrade | egrep -o -e "http://[^\']+" | sudo aria2c -c -d /var/cache/apt/archives -i -; sudo aptitude -y safe-upgrade

freethinker · 2010-02-18 16:02:29 6
Pull Total Memory Usage In Virtual Environment

This command basically adds up all of the individual instances processes and gives you a grand total for used memory in that instance alone.
This is sample output - yours may be different.
3

ps axo rss,comm | awk '{sum+=$1; print $1/1024, "MB - ", $2} END {print "\nTotal RAM Used: ", sum/1024, "MB\n"}'

johnss · 2010-02-18 12:05:45 7
Type a random string into a X11 window

Just after you type enter, you have 3 seconds to switch window, then "texthere" will be "typed" in the X11 application that has focus. Very useful to beat your score at games such as "How fast can you type A-Z".
This is sample output - yours may be different.
5

sleep 3 && xdotool type --delay 0ms texthere

drinkcat · 2010-02-18 11:44:18 20
List available upgrades from apt without upgrading the system
This is sample output - yours may be different.
3

apt-get --just-print upgrade

noqqe · 2010-02-18 11:19:05 8
Show top committers for SVN repositority for today
This is sample output - yours may be different.
6

svn log -r {`date "+%Y-%m-%d"`}:HEAD|grep '^r[0-9]' |cut -d\| -f2|sort|uniq -c

ivanatora · 2010-02-18 10:41:17 4
Averaging columns of numbers

Computes a columns average in a file. Input parameters = column number and optional pattern. Show Sample Output
This is sample output - yours may be different.
```
$> cat 0.5-10000.dat | avg 2 
Average over 10000 lines: 1.005299
```
0

function avg { awk "/$2/{sum += \$$1; lc += 1;} END {printf \"Average over %d lines: %f\n\", lc, sum/lc}"; }

vimzard · 2010-02-18 10:20:22 4
output your microphone to a remote computer's speaker
This is sample output - yours may be different.
32

arecord -f dat | ssh -C user@host aplay -f dat

drinkcat · 2010-02-18 06:00:33 25
How to install cron (crond, crontab)
This is sample output - yours may be different.
-15

yum install vixie-cron crontabs

svnlabs · 2010-02-17 16:36:10 6
Caching-Nameserver

Caching-Nameserver Show Sample Output
This is sample output - yours may be different.
```
install packages
yum -y install bind bind-chroot caching-nameserver

start service
service named restart

set autostart
chkconfig named on
```
-11

yum -y install bind bind-chroot caching-nameserver

svnlabs · 2010-02-17 16:35:06 3

RHEL / CentOS Support 4GB or more RAM ( memory )

RHEL / CentOS Support 4GB or more RAM ( memory ) Show Sample Output

-13

yum install kernel-PAE

svnlabs · 2010-02-17 16:34:09 4

How to Disable SELinux

just change SELINUX=enforcing to SELINUX=permissive, and you're done. Reboot if you want to prove it. Show Sample Output
This is sample output - yours may be different.
```
just change SELINUX=enforcing to SELINUX=permissive, and you're done. Reboot if you want to prove it.
```
-7

echo 0 >/selinux/enforce

svnlabs · 2010-02-17 16:33:26 3
View acceptable client certificate CA names asked for during SSL renegotiations

The key is to use the -prexit option at the command line, and then type "quit" instead of CTRL-C to exit OpenSSL. OpenSSL will then dump its last negotiated state, printing out the contents of the renegotiated handshake. Crucial for debugging client certificate configurations on web servers such as IIS, which renegotiate the SSL/TLS connection with the HTTP request in-flight to ask the client for a cert. Show Sample Output
This is sample output - yours may be different.
```
GET / HTTP/1.1
Host: www.example.com

read R BLOCK
HTTP/1.1 403 Forbidden

quit

---
Acceptable client certificate CA names
/C=US/O=YourOrg/OU=YourUnit/CN=YourCertificateAuthorityName1
/C=US/O=YourOrg/OU=YourUnit/CN=YourCertificateAuthorityName2
---
```
3

openssl s_client -connect www.example.com:443 -prexit

JonInVA · 2010-02-17 15:46:37 5
Provide a list of all ELF binary objects (executable or libs) in a directory

This is a dirty raw way to simply list ELF objects in a folder. The output is ready to be parsed i.e to the stripper or what else needs a path to an ELF object. Show Sample Output
This is sample output - yours may be different.
```
karmic@linux64:/home/karmic64/Test$ file /usr/bin/* | grep ELF | cut -d":" -f1 
/usr/bin/a2p
/usr/bin/aacplusenc
/usr/bin/aconnect
/usr/bin/acpi_fakekey
/usr/bin/acpi_listen
/usr/bin/addpart
/usr/bin/addr2line
/usr/bin/alsamixer
/usr/bin/amdcccle
/usr/bin/amidi
/usr/bin/amixer
/usr/bin/animate
/usr/bin/aplay
/usr/bin/aplaymidi
/usr/bin/appres
/usr/bin/apt-cache
```
-1

file /usr/bin/* | grep ELF | cut -d":" -f1

LucaCappelletti · 2010-02-17 14:01:52 3
Remote screenshot

The `export` is unnecessary if it's only applicable to the one command.
This is sample output - yours may be different.
18

DISPLAY=":0.0" import -window root screenshot.png

walterl · 2010-02-17 13:02:24 16
Remote Screenshot

Like the given command, but combines _DISPLAY=":0.0"_ with _export DISPLAY_ to get _export DISPLAY=":0.0"_ and only imports if DISPLAY is set successfully.
This is sample output - yours may be different.
-3

export DISPLAY=":0.0" && import -window root screenshot.png

fraktil · 2010-02-17 12:13:49 3
Count and show duplicate file names

Useful for C projects where header file names must be unique (e.g. when using autoconf/automake), or when diagnosing if the wrong header file is being used (due to dupe file names) Show Sample Output
This is sample output - yours may be different.
```
[user@localhost]$ find . -type f  |sed "s#.*/##g" |sort |uniq -c -d
      2 globals.h
      9 Makefile
      8 Makefile.bak
```
0

find . -type f |sed "s#.*/##g" |sort |uniq -c -d

shadycraig · 2010-02-17 11:59:54 5
diff recursively, ignoring CVS control files

This will cause diff to ignore any files whose path matches "*CVS*", ie any CVS control files.
This is sample output - yours may be different.
0

diff -x "*CVS*" -r <path-1> <path-2> [<path-3>]

sanmiguel · 2010-02-17 11:08:17 5
Introduction to user commands

Tested on debian and ubuntu. Translations could be useless, so "LANG=C man intro" is a better alternative.
This is sample output - yours may be different.
4

man intro

peppet · 2010-02-17 10:11:56 5
Allow any local (non-network) connection to running X server
This is sample output - yours may be different.
1

xhost +local:

peppet · 2010-02-17 09:20:39 3
Remote screenshot

Say if you're logged into a remote system via ssh and this system has an x window system, but yet you still want a screen shot of what's going on graphically. This will do it for you. :-)
This is sample output - yours may be different.
3

DISPLAY=":0.0"; export DISPLAY; import -window root gotya.png

Abiden · 2010-02-17 09:13:54 3
Google Spell Checker

I took matthewbauer's cool one-liner and rewrote it as a shell function that returns all the suggestions or outputs "OK" if it doesn't find anything wrong. It should work on ksh, zsh, and bash. Users that don't have tee can leave that part off like this: spellcheck(){ typeset y=$@;curl -sd "<spellrequest><text>$y</text></spellrequest>" https://google.com/tbproxy/spell|sed -n '/s="[1-9]"/{s/<[^>]*>/ /g;s/\t/ /g;s/ *$.*$/Suggestions: \1\n/g;p}';} Show Sample Output
This is sample output - yours may be different.
```
$ spellcheck motaive
Suggestions: motive motives mutative emotive motif

$ spellcheck now is the winter of our dicontent
Suggestions: discontent content contend

$ spellcheck panoply
OK
```
6

spellcheck(){ typeset y=$@;curl -sd "<spellrequest><text>$y</text></spellrequest>" https://www.google.com/tbproxy/spell|sed -n '/s="[0-9]"/{s/<[^>]*>/ /g;s/\t/ /g;s/ *$.*$/Suggestions: \1\n/g;p}'|tee >(grep -Eq '.*'||echo -e "OK");}

eightmillion · 2010-02-17 08:20:48 17
Google Spell Checker

http://immike.net/blog/2007/04/07/hacking-google-spell-checker-for-fun-and-profit/ Show Sample Output
This is sample output - yours may be different.
```
spell
```
1

spellcheck(){ curl -sd "<spellrequest><text>$1</text></spellrequest>" https://www.google.com/tbproxy/spell | sed 's/.*<spellresult [^>]*>$.*$<\/spellresult>/\1/;s/<c $[^>]*$>$[^<]*$<\/c>/\1;\2\n/g' | grep 's="1"' | sed 's/^.*;$[^\t]*$.*$/\1/'; }

matthewbauer · 2010-02-17 01:55:28 14
rename all jpg files with a prefix and a counter
This is sample output - yours may be different.
3

ls *.jpg | grep -n "" | sed 's,.*,0000&,' | sed 's,0*$...$:$.*$.jpg,mv "\2.jpg" "image-\1.jpg",' | sh

pepin · 2010-02-16 23:59:28 3
Get your commandlinefu points (upvotes - downvotes)

This version prints current votes and commands for a user. Pass the user as an argument. While this technically "fits" as a one liner, it really is easier to look at as a shell script with extra whitespace. :) Show Sample Output
This is sample output - yours may be different.
```
  0  sed 's/.*/ /'
  0  date -s "`curl -sI www.example.com | sed -n 's/^Date: //p'`"
  0  jot -s '' -b '-' 50
  7  command | sed -n '1,/regex/p'
  4  curl -s search.twitter.com | awk -F'</?[^>]+>' '/\/intra\/trend\//{print $2}'
  5  dig +short -x {ip}
```
2

curl -s http://www.commandlinefu.com/commands/by/$1/xml | awk -F'</?div[^>]*>' '/class=\"command\"/{gsub(/"/,"\"",$2); gsub(/</,"<",$2); gsub(/>/,">",$2); gsub(/&/,"\\&",$2); cmd=$2} /class=\"num-votes\"/{printf("%3i %s\n", $2, cmd)}'

putnamhill · 2010-02-16 17:24:45 5
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What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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ls -qahlSr # list all files in size order - largest last

I find it useful, when cleaning up deleting unwanted files to make more space, to list in size order so I can delete the largest first. Note that using "q" shows files with non-printing characters in name. In this sample output (above), I found two copies of the same iso file both of which are immediate "delete candidates" for me.

Read aloud a text file in Ubuntu (and other Unixes with espeak installed

Watch how many tcp connections there are per state every two seconds.

Redirect STDIN

Several times, I find myself hitting my up arrow, and changing the search term. Unfortunately, I find myself wasting too much time typing: $ grep kernel /var/log/messages Redirecting STDIN allows me to put the search term at the end so I less cursor movement to change what I'm searching for: $ < /var/log/messages grep kernel If you're using the emacs keyboard binding, then after you press your up arrow, press CTRL+w to erase the word. If this has already been submitted, I couldn't find it with the search utility.

Copy sparse files

This causes cp to detect and omit large blocks of nulls. Sparse files are useful for implying a lot of disk space without actually having to write it all out. http://en.wikipedia.org/wiki/Sparse_file You can use it in a pipe too: $ dd if=/dev/zero bs=1M count=5 |cp --sparse=always /dev/stdin SPARSE_FILE

which process has a port open

Convert PDF to JPEG using Ghostscript

Converting your PDF file to JPEG images. You can set resolution by -r option (default: 72dpi).

Recursively remove all empty directories

Backup file, create dir and set perms in one shot

Prior to working on/modifying a file, use the 'install -m' command which can both copy files, create directories, and set their permissions at the same time. Useful when you are working in the public_html folder and need to keep the cp'd file hidden.

Change string in many files at once and more.

Find all files that contain string XXX in them, change the string from XXX to YYY, make a backup copy of the file and save a list of files changed in /tmp/fileschanged.

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