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Print free RAM in MB

Does not output the word "shared" so you can easily store this number in a variable. Show Sample Output
This is sample output - yours may be different.
```
1029
```
0

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

felixhummel · 2012-03-13 19:54:26 4
firefox ascii logo
This is sample output - yours may be different.
0

curl -s http://people.mozilla.com/~faaborg/files/shiretoko/firefoxIcon/firefox-64.png | convert - jpg:- | jp2a --color --html -> firefox.html

kev · 2012-04-30 16:31:07 5
Create a tar archive from a text list without trailing slash in directories
This is sample output - yours may be different.
0

cat list.txt | pax -wd > archive.tar

bugmenot · 2013-01-02 17:53:52 4
Find files in current directory which are larger in size (500000k)
This is sample output - yours may be different.
0

find . -type f -size +50000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

maheshmahajan · 2014-06-24 07:24:39 7
Calculate CPU load limit on GNU/Linux

shell order of operation example which calculates: x = number of physical CPU's y = number of cores per CPU 2(x * y) + 1 = CPU load limit Show Sample Output
This is sample output - yours may be different.
```
9
```
0

echo "$(( $(( $(grep 'physical id' '/proc/cpuinfo' | uniq | wc -l) * $(grep 'core id' '/proc/cpuinfo' | wc -l) )) * 2 + 1 ))"

snorf · 2015-11-14 20:44:39 11
Gets shellcode opcodes from binary file using objdump

Seems to work on Ubuntu 14.02 LTS Show Sample Output
This is sample output - yours may be different.
```
"\x31\xc0\xb0\x04\x31\xdb\xb3\x01\xeb\x11\x59\x31\xd2\xb2\x0e\xcd\x80\x31"
```
0

objdump -s ./HelloWorld | grep -v '^ [0-9a-f][0-9a-f][0-9a-f][0-9a-f] \b' | grep -v 'Contents' | grep -v './' | cut -d' ' -f 3-6| sed 's/ //g' | sed '/./!d' | tr -d '\n'| sed 's/.\{2\}/&\\x/g' | sed 's/^/\\x/'|sed 's/..$//'|sed 's/^/"/;s/$/"/g'

mark20 · 2016-10-05 23:31:05 17
Color code each job for GNU Parallel

Colorize each job in a new color.
This is sample output - yours may be different.
0

parallel -j10 --tagstring '\033[30;{=$_=++$::color%8+90=}m' sleep .3{}\;seq {} ::: {1..10}

unixmonkey91589 · 2017-07-05 19:36:27 20
Creat a new user with no shell. Useful to provide other services without giving shell access.
This is sample output - yours may be different.
0

useradd -s /sbin/nologin nicdev

nicdev · 2009-02-15 14:49:17 10
print latest (top 10, top 3 or *) commandlinefu.com commands

This lengthy cryptic line will print the latest top 10 commandlinefu.com posts without their summaries. To print also their respective summaries use the following (even bigger) command line: wget -qO - http://www.commandlinefu.com/feed/tenup | xmlstarlet sel -T -t -o '<doc>' -n -t -m rss/channel/item -o '<item>' -n -o '<title>' -v title -o '</title>' -n -o '<description>' -v description -o '</description>' -n -o '</item>' -n -t -o '</doc>' | xmlstarlet sel -T -t -m doc/item -v description/code -n -v title -n -n It is recommended to include this line into a shell script to be easily run, as I do myself. You could also use the following URLs to browse the top 3 commands: wget -qO - http://www.commandlinefu.com/feed/threeup | xmlstarlet ... .. or all others: wget -qO - http://feeds2.feedburner.com/Command-line-fu | xmlstarlet ... PS: You need to install "xmlstarlet" to run it. It is found in Debian APT repositories (apt-get install xmlstarlet) or under the http://xmlstar.sourceforge.net/ URL. Show Sample Output
This is sample output - yours may be different.
```
$ ps aux | grep [p]rocess-name
$ getconf LONG_BIT
$ for I in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $I | gzip > $I.sql.gz"; done
$ free && sync && echo 3 > /proc/sys/vm/drop_caches && free
$ find . -empty -type d -exec rmdir {} +
$ exiftool '-Directory<DateTimeOriginal' -d %Y/%m/%d dir
$ tmpfile=$(mktemp) && echo -e 'startup_message off\nscreen -t top htop\nsplit\nfocus\nscreen -t nethogs nethogs wlan0\nsplit\nfocus\nscreen -t iotop iotop' > $tmpfile && sudo screen -c $tmpfile
$ /sbin/kexec -l /boot/$KERNEL --append="$KERNELPARAMTERS" --initrd=/boot/$INITRD; sync; /sbin/kexec -e
$ dig +short txt <keyword>.wp.dg.cx
$ autossh -M50000 -t server.example.com 'screen -raAd mysession'
$ knock <host> 3000 4000 5000 && ssh -p <port> user@host && knock <host> 5000 4000 3000
$ cat /var/log/secure.log | awk '{print substr($0,0,12)}' | uniq -c | sort -nr | awk '{printf("\n%s ",$0) ; for (i = 0; i<$1 ; i++) {printf("*")};}'
$ for x in `jot - 0 2400 25`; do curl "http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/$x"  ; done > commandlinefu.txt
$ ssh -t remote_host screen -r
$ diff <(echo "$a") <(echo "$b")
```
0

wget -qO - http://www.commandlinefu.com/feed/tenup | xmlstarlet sel -T -t -o '<x>' -n -t -m rss/channel/item -o '<y>' -n -v description -o '</y>' -n -t -o '</x>' | xmlstarlet sel -T -t -m x/y -v code -n

fsilveira · 2009-08-14 02:44:00 3
Outputs a 10-digit random number
This is sample output - yours may be different.
0

echo $RANDOM$RANDOM$RANDOM |cut -c3-12

emmerich164 · 2009-10-13 08:08:45 4
Ignore subdirectories in subversion

If you would like to ignore a directory including its subdirectory. For example, a tmp/ directory
This is sample output - yours may be different.
0

find . -type d -not $ -name .svn -prune $ -exec svn propset svn:ignore '*' {} \;

tristan_ph · 2010-08-15 03:45:57 4
GREP a PDF file.
This is sample output - yours may be different.
0

grep -i '[^script$]' 1.txt

vinod · 2010-10-20 12:17:04 3
Convert .ogg to .avi
This is sample output - yours may be different.
0

mencoder -idx a.ogg -ovc lavc -oac mp3lame -o b.avi

lukasz · 2010-12-20 14:30:48 3
get a random command
This is sample output - yours may be different.
0

find $(echo "$PATH" | tr ':' ' ') -name "*program*"

hunterm · 2011-01-07 22:27:44 5
Losslessly optimize JPEG files for file size

You can also save EXIF information by copying it to temp.jpg: jpegtran -optimize -outfile temp.jpg <JPEG> && jhead -te temp.jpg "$_" && mv temp.jpg "$_"
This is sample output - yours may be different.
0

jpegtran -optimize -outfile temp.jpg <JPEG> && mv temp.jpg "$_"

h3xx · 2011-07-24 08:55:46 3
Access to a SVN repository on a different port

first need to Edit the configuration file /home/cicciobomba/.subversion and under the [tunnels] add this line ciccio_diverso = /usr/bin/ssh -p 12345
This is sample output - yours may be different.
0

sudo svn co svn+ ciccio_diverso://root@192.160.150.151/svn-repo/progettino

0disse0 · 2012-02-03 18:16:02 12
Filter Android log output by PID
This is sample output - yours may be different.
0

adb shell ps | grep my.app.packagename | awk '{print $2}' | xargs -I ? sh -c "adb logcat -v time | grep ?"

jackpatmos · 2012-03-14 10:02:11 5
Pretend your shell is MS-DOS command.com

(This may be specific to bash only.) This transforms the current working directory to all uppercase characters and replaces forward slashes with backslashes, prepending the string with "C:" and appending a single ">". It serves no practical purpose, but may serve as a great practical joke if you can insert it to some victim's .bashrc :-) Show Sample Output
This is sample output - yours may be different.
```
C:\>pwd
/
C:\>
```
0

export PROMPT_COMMAND=$PROMPT_COMMAND'; export PWD_UPCASE="${PWD^^}"'; export PS1='C:${PWD_UPCASE//\\//\\\\}>'

chungy · 2012-04-30 20:09:49 3
Command to kill PID

You can also use gawk: ps auxww | gawk '/application/' | gawk '/processtobekilled/' | gawk '{print $2}' | grep -v grep | xargs kill -9
This is sample output - yours may be different.
0

ps auxww | grep application | grep processtobekilled | gawk '{print $2}' | grep -v grep | xargs kill -9

j0sh10 · 2012-07-03 20:37:56 43
Get user's full name in Mac OS X
This is sample output - yours may be different.
0

finger `whoami` | awk -F: '{ print $3 }' | head -n1 | sed 's/^ //'

andrew_duffy · 2013-01-03 20:19:03 7
Sync a remote mysql database to a local db via SSH

There must be no space between -p and the password
This is sample output - yours may be different.
0

ssh <remoteuser>@<remoteserver> \ 'mysqldump -u <user> -p<password> <database>' \ | mysql -u <user> -p<password> <database>

kvcrawford · 2013-03-05 19:20:52 14
Maximize active window

Bind it to a shortcut key, using something like xbindkeys-config (if you do not have xbindkeys: apt-get install xbindkeys xbindkeys-config)
This is sample output - yours may be different.
0

wmctrl -r :ACTIVE: -b add,maximized_vert; wmctrl -r :ACTIVE: -b add,maximized_horz

paulera · 2013-04-24 16:59:04 11
bulk git pull
This is sample output - yours may be different.
0

for dir in ~/git/*; do (cd "$dir" && git pull); done

oumu · 2013-07-06 14:24:18 7
IBM AIX: Verify a sha256sum listing with openssl

This command is used to verify a sha256sum-formatted file hash list on IBM AIX or any other UNIX-like OS that has openssl but doesn't have sha256sum by default. Steps: 1: Save to the filesystem a script that: A: Receives as arguments the two parts of one line of a sha256sum listing B: Feeds a file into openssl on SHA256 standard input hash calculation mode, and saves the result C: Compares the calculated hash against the one received as argument D: Outputs the result in a sha256sum-like format 2: Make the script runnable 3: Feed the sha256sum listing to xargs, running the aforementioned script and passing 2 arguments at a time Show Sample Output
This is sample output - yours may be different.
```
cognos-EARs/ServletGateway-1021-SDK-customized.ear: OK
cognos-EARs/ServletGateway-1021-SDK-customizedandfixed.ear: OK
cognos-EARs/ServletGateway-1021-base.ear: OK
cognos-EARs/p2pd-1021-SDK-customized.ear: OK
cognos-EARs/p2pd-1021-base.ear: OK
```
0

echo '#! /usr/bin/ksh\ncat $2 | openssl dgst -sha256 | read hashish; if [[ $hashish = $1 ]]; then echo $2: OK; else echo $2: FAILED; fi;' > shacheck; chmod +x shacheck; cat hashishes.sha256 | xargs -n 2 ./shacheck;

RAKK · 2013-09-18 21:51:20 8
Convert a .ogv recording (eg from recordmydesktop in Gnome/Linux) into a .wmv (eg for playback in Windows)

I needed to convert a screen capture when using Gnome's "recordmydesktop" and convert it to a .wmv for playback in Windows.
This is sample output - yours may be different.
0

ffmpeg -i input.ogv -qscale 0 output.wmv # convert .ogv to .wmv

mpb · 2014-06-24 16:23:18 7
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list block devices

Shows all block devices in a tree with descruptions of what they are.

Route outbound SMTP connections through a addtional IP address rather than your primary

how to export a table in .csv file

Exports the result of query in a csv file

Execute a command with a timeout

Find all videos under current directory

Uses mime-type of files rather than relying on file extensions to find files of a certain type. This can obviously be extended to finding files of any other type as well.. like plain text files, audio, etc.. In reference to displaying the total hours of video (which was earlier posted in command line fu, but relied on the user having to supply all possible video file formats) we can now do better: $ find ./ -type f -print0 | xargs -0 file -iNf - | grep video | cut -d: -f1 | xargs -d'\n' /usr/share/doc/mplayer/examples/midentify | grep ID_LENGTH | awk -F "=" '{sum += $2} END {print sum/60/60; print "hours"}'

Check whether laptop is running on battery or cable

1 = on ac, 0 = on bat

Show current pathname in title of terminal

This helps to keep track of what is going on when you have several tabs open in your terminal. The title automatically changes when you change directories.

Check if a command is available in your system

Usefull to detect if a commad that your script relies upon is properly installed in your box, you can use it as a function function is_program_installed() { type "$1" >/dev/null } Invoke it and check the execution code is_program_installed "dialog" if [ ! $? -eq 0 ]; then echo "dialog is not installed" exit 1 fi

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

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