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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 83

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 49

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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check open ports without netstat or lsof

Create a new file

Check the package is installed or not. There will show the package name which is installed.

The ^python$ is a package name patten. You can change whatever you want.

Rename files in batch

Binary digits Matrix effect

Prints 0's and 1's in The Matrix style. You can easily modify to print 0-9 digits using $RANDOM %10 insted of %2.

vi keybindings with info

Info has some of the worst keybindings I've ever seen. Being a vim user, I attribute that to emacs influence. Use the --vi-keys option to use some of the vi keybindings, although this won't change all the keybindings. Use the "infokey" program to have more control over info keybindings.

intercept stdout/stderr of another process or disowned process

Useful to recover a output(stdout and stderr) "disown"ed or "nohup"ep process of other instance of ssh. With the others options the stdout / stderr is intercepted, but only the first n chars. This way we can recover ALL text of stdout or stderr

Buffer in order to avoir mistakes with redirections that empty your files

A common mistake in Bash is to write command-line where there's command a reading a file and whose result is redirected to that file. It can be easily avoided because of : 1) warnings "-bash: file.txt: cannot overwrite existing file" 2) options (often "-i") that let the command directly modify the file but I like to have that small function that does the trick by waiting for the first command to end before trying to write into the file. Lots of things could probably done in a better way, if you know one...

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Hostname tab-completion for ssh

This is meant for the bash shell. Put this function in your .profile and you'll be able to use tab-completion for sshing any host which is in your known_hosts file. This assumes that your known_hosts file is located at ~/.ssh/known_hosts. The "complete" command should go on a separate line as such: function autoCompleteHostname() { local hosts=($(awk '{print $1}' ~/.ssh/known_hosts | cut -d, -f1)); local cur=${COMP_WORDS[COMP_CWORD]}; COMPREPLY=($(compgen -W '${hosts[@]}' -- $cur )) } complete -F autoCompleteHostname ssh

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