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Sum files of certain extension in given directory

Also shows files as they are found. Only works from a tty.
This is sample output - yours may be different.
-1

echo $(find <directory> -name '*.<extension>' -exec du -s {} \; | tee $(tty) | cut -f1 | tr '\n' '+') 0 | bc

ysangkok · 2012-09-17 22:46:50 11
check to see what is running on a specific port number
This is sample output - yours may be different.
-1

sudo netstat -tulpn | grep :8080

BU5T4 · 2013-07-30 13:10:50 8
Find all python modules that use the math module
This is sample output - yours may be different.
-1

find . -name "*.py" -exec grep -n -H -E "^(import|from) math" {} \;

chillihead · 2009-03-31 19:56:42 6
Recreate all initrd files

Do this with caution.
This is sample output - yours may be different.
-1

for kern in $(grep "initrd " /boot/grub/grub.conf|grep -v ^#|cut -f 2- -d-|sed -e 's/\.img//g'); do mkinitrd -v -f /boot/initrd-$kern.img $kern; done

oernii2 · 2009-08-19 09:53:29 502
Print free memory
This is sample output - yours may be different.
-1

free -m | awk '/Mem/ {print $4}'

agudmund · 2010-11-29 13:31:55 6
Identifying Xorg video driver in use

The above one liner can be used to determine what card/driver is Xorg currently using. For additional information, see http://goo.gl/mDnWu Show Sample Output
This is sample output - yours may be different.
```
[    27.597] (II) RADEON(0): PCIE card detected
[    27.638] (II) RADEON(0): Output LVDS connected
```
-1

egrep -i " connected|card detect|primary dev" /var/log/Xorg.0.log

axelabs · 2011-02-24 18:04:04 5
check apache2 status with a lot of details

check apache2 status with a lot of details
This is sample output - yours may be different.
-1

apachectl fullstatus

Ovidiu · 2011-05-17 13:42:31 3
Find all machines on the network using broadcast ping

A simple way to find all machines on a network subnet is pinging a broadcast address (-b flag). First run ifconfig ifconfig. Then use "Bcast" address and '-b' flag in ping Show Sample Output
This is sample output - yours may be different.
```
$ ifconfig 
  inet addr:192.168.128.19  Bcast:192.168.135.255  Mask:255.255.248.0

$ ping -b 192.168.135.255
  192.168.129.19
  192.168.129.20
  192.168.129.21
  ...
```
-1

ping -b <broadcast address>

OutputLogic · 2012-05-21 16:55:33 7
Find files/directories newer than X

Sometimes you just want to operate on files that were created after specific date. This command consists of 3 commands: - Create a dummy file with the custom date - Find all files with "creation time" further than our custom date by using `-newer` find option. Add your crazy stuff here, like moving, deleting, printing, etc. - Remove the dummy file Show Sample Output
This is sample output - yours may be different.
```
./afile
./bfile
```
-1

touch -t 197001010000 ./tmp && find . -newer ./tmp && rm -f ./tmp

sergeylukin · 2014-11-18 00:29:26 8

Shows all virtual machines in Citrix XenServer

Citrix XenServer 5.6, can be piped to grep for more interesting output Show Sample Output

-1

xe vm-list

layer8 · 2010-09-28 18:22:03 3

The program listening on port 8080 through IPv6
This is sample output - yours may be different.
-1

lsof -Pnl +M -i6 | grep 8080

omidaladini · 2010-11-01 15:36:35 3
print a cpu of a process
This is sample output - yours may be different.
-1

ps -eo args,%cpu | grep -m1 PROCESS | tr 'a-z-' ' ' | awk '{print $1}'

lin72 · 2010-11-29 17:43:52 4
Add a list of numbers
This is sample output - yours may be different.
-1

echo $((1+2+3+4))

dimesacks · 2011-02-24 21:57:44 3
Generat a Random MAC address
This is sample output - yours may be different.
-1

2>/dev/null dd if=/dev/urandom bs=1 count=6 | od -t x1 |sed '2d;s/^0\+ //;s/ /:/g'

flyc0r · 2011-05-17 21:04:35 3
Copy a virtual machine on Citrix XenServer, optionally to a different storage repository
This is sample output - yours may be different.
-1

xe vm-copy vm="ABCServer" sr-uuid=24565487-accf-55ed-54da54993ade784a new-name-label="Copy of ABCServer" new-name-description="New Description"

layer8 · 2010-09-28 18:23:56 3
urldecoding

urldecode files in current directrory
This is sample output - yours may be different.
-1

ls * | while read fin;do fout=$(echo -n $fin | sed -e's/%$[0-9A-F][0-9A-F]$/\\\\\x\1/g' | xargs echo -e);if [ "$fout" != "$fin" ];then echo "mv '$fin' '$fout'";fi;done | bash -x

pawelb1973 · 2011-05-18 07:24:54 85

exa

nothing fancy `ls` alternative `exa`, with most info printed and passed through less with the `-R` (raw) option, to preserve colour output https://github.com/ogham/exa You can add or remove `-@` to print extended attributes for files that have them. Show Sample Output

-1

exa -glhrSuU -s size --group-directories-first -@ | less -R

wires · 2016-02-27 17:19:43 52

delete all leading whitespace from each line in file
This is sample output - yours may be different.
-1

sed 's/^[ \t]*//' < <file> > <file>.out; mv <file>.out <file>

potatoface · 2010-08-23 21:37:14 3
kills all php5-fcgi processes for user per name

Similar commands, same origin. pgrep [-cflvx] [-d delimiter] [-n|-o] [-P ppid,...] [-g pgrp,...] [-s sid,...] [-u euid,...] [-U uid,...] [-G gid,...] [-t term,...] [pattern] pkill [-signal] [-fvx] [-n|-o] [-P ppid,...] [-g pgrp,...] [-s sid,...] [-u euid,...] [-U uid,...] [-G gid,...] [-t term,...] [pattern]
This is sample output - yours may be different.
-1

pkill -9 -u username php5-fcgi

hpavc · 2011-08-09 22:14:21 2
recursive permission set for xampp apache user nobody
This is sample output - yours may be different.
-1

sudo chown -R nobody:admin /Applications/XAMPP/xamppfiles/htdocs/

matths · 2011-09-12 09:19:34 5
Arch Linux sort installed packages by size

This, like the other commands listed here, displays installed arch packages. Unlike the other ones this also displays the short description so you can see what that package does without having to go to google. It also shows the largest packages on top. You can optionally pipe this through head to display an arbitrary number of the largest packages installed (e.g. ... | head -30 # for the largest 30 packages installed) Show Sample Output
This is sample output - yours may be different.
```
 253888.00 KiB    wine    A compatibility layer for running Windows programs
 241743.00 KiB    libreoffice-common      common files for LibreOffice - a productivity suite that is compatible with other major office suites
 121212.00 KiB    openjdk6        Free Java environment based on OpenJDK 6.0 with IcedTea6 replacing binary plugs.
 108232.00 KiB    chromium        The open-source project behind Google Chrome, an attempt at creating a safer, faster, and more stable browser
```
-1

pacman -Qi | grep 'Name\|Size\|Description' | cut -d: -f2 | paste - - - | awk -F'\t' '{ print $2, "\t", $1, "\t", $3 }' | sort -rn

GetterNoCheddar · 2012-11-20 03:40:55 8
Sed file spacing

G option cause a file to be spacing line by line. Show Sample Output
This is sample output - yours may be different.
```
$ sed G datascript.1 
unset log

unset label

set autoscale
```
-1

sed G

servermanaged · 2009-05-02 12:11:40 4
Show current folder permission from /, useful for debugging ssh key permission

Handled all within awk. Takes the value from $PWD and constructs directory structures and runs commands against them. The gsub() call is not necessary, but added for better visibility. If a variable DIR is given on the awk command-line, then that directory is used instead: awk -vDIR=$HOME/.ssh 'BEGIN{dir=DIR?...}' Show Sample Output
This is sample output - yours may be different.
```
drwxr-xr-x 22 root root 4096 2009-10-21 23:30 /
drwxr-xr-x 3 root root 4096 2009-10-20 13:33 /home
drwxr-xr-x 54 luser luser 4096 2009-10-22 09:48 /home/luser
```
-1

awk 'BEGIN{dir=DIR?DIR:ENVIRON["PWD"];l=split(dir,parts,"/");last="";for(i=1;i<l+1;i++){d=last"/"parts[i];gsub("//","/",d);system("ls -ld \""d"\"");last=d}}'

arcege · 2009-10-22 16:28:07 5
Get Memeory Info

Get Memeory Info
This is sample output - yours may be different.
-1

cat /proc/meminfo

svnlabs · 2010-01-22 16:48:03 3
change dir to n-th dir that you listed

Replace the head -1 with head -n that is the n-th item you want to go to. Replace the head with tail, go to the last dir you listed. You also can change the parameters of ls.
This is sample output - yours may be different.
-1

cd $(ls -ltr|grep ^d|head -1|sed 's:.*\ ::g'|tail -1)

timothyhmchen101 · 2011-08-10 03:39:35 2
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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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static noise effect (crt effect)

Picture Renamer

jhead is a very nice tool to do all sorts of things with photographs, in a batch-oriented way. It has a specific function to rename files based on dates, and the format I used above was just an example.

copy string to clipboard

Copy the current path. Use -selection clipboard to copy the string to clipboard.

lotto generator

Find the package that installed a command

move up through directories faster (set in your /etc/profile or .bash_profile)

You can also remove the "&& pwd" if you don't want it to print out each directory as it moves up.

Copy all files. All normal files, all hidden files and all files starting with - (minus).

./* is for copying files starting with - .[!.]* is for copying hidden files and avoiding copying files from the parent directory. ..?* is for copying files starting with .. (avoids the directory ..) /path/to/dir the path to the directory where the files should be copied Can also be used as a script. Input argument is /path/to/dir in tcsh, replace .[!.]* with .[^.]*

Mostly silent FLAC checking (only errors are displayed)

FLAC's built in integrity checks are far more useful then devising a scheme to use MD5 sum files. This will check all the FLAC in a directory and output only errors. Remove the "s" after the "t" and it will be somewhat verbose in the check.

Change timestamp on a file

-a for access time, -m for modification time, -c do not create any files, -t timestamp

Download file with multiple simultaneous connections

jrk's aria2 example is incorrect. -s specifies the global connection limit; the per-host connection limit is specified with -x.

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