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Read source of some installed Perl module
This is sample output - yours may be different.
0

perldoc -m Some::Module

fibo · 2014-03-03 16:00:03 6
Wake up a remote computer

Wakes up a computer on your LAN with a Wake-On-LAN packet. MAC Address must match the NIC MAC, computer must have WOL enabled in the BIOS. Show Sample Output
This is sample output - yours may be different.
```
Sending magic packet to 255.255.255.255:9 with 00:00:DE:AD:BE:EF
```
0

wakeonlan 00:00:DE:AD:BE:EF

tyzbit · 2014-06-13 16:16:33 8
Open image file from command line

Works in Gnome
This is sample output - yours may be different.
0

eog someimg.jpg

dnlcorrea · 2014-10-05 00:58:46 8
Grep ip addresses from access attempts to a page and add them to an ipset referenced by an iptables rule
This is sample output - yours may be different.
0

grep page.php /var/log/httpd/access_log|awk '{print $1}'|sort|uniq|perl -e 'while (<STDIN>){chomp; $cmd=`ipset add banned -! -q $_`; }'

luchino7773 · 2015-05-13 07:08:59 10
Monitor memory fine-grained usage (e.g. firefox)

I have modified the original one-liner to allow it to manage multiple PIDs. However, I haven't found the way it can work properly with the watch command. NOTE: brace expand must be activated via "set -B" in order to this script can work. Show Sample Output
This is sample output - yours may be different.
```
961936 KB
```
0

cat $(echo "ls /proc/{`pidof firefox | sed -e 's/$/,/' -e 's/ /,/g'`}/smaps 2>/dev/null" | bash) | awk '/Rss/{sum += $2; } END{print sum, "KB"}'

pchalim · 2015-09-30 22:22:53 9
Delete a certificate from the macOS security keychain

Use `security list-keychains` to find possible keychains, and `security dump-keychain` to look for certificates. `sudo security delete-certificate` without arguments shows options for removing: by common name or by SHA-1 hash. This is especially useful if a certificate locks up Keychain Access.app, which happens for certificates with many SANs in macOS 10.12. Found via: http://stackoverflow.com/a/16019443
This is sample output - yours may be different.
0

sudo security delete-certificate -c 1000-sans.badssl.com

lgarron · 2017-04-06 01:40:04 21
get the public ip adress of server on shell
This is sample output - yours may be different.
0

ifconfig | grep "inet addr:" | cut -d: -f2 | awk {'print($1)'} | grep -v 127.0

aysadk · 2017-05-23 21:43:15 17
Disable mouse acceleration
This is sample output - yours may be different.
0

xset m default

tofu00 · 2017-11-29 10:17:53 28
git log1 alias

This command limits the oputut of git log to one-line per commit and an abbreviated commit ID. Show Sample Output
This is sample output - yours may be different.
```
% git log1
45c82b5... Merge branch 'header-fixes-for-linus'
<etc>
```
0

git config --global alias.log1 "log --pretty=oneline --abbrev-commit"

bartman · 2009-02-13 23:38:42 10
what the free memory grow or shink
This is sample output - yours may be different.
0

watch -d "free -mt"

srineer · 2009-02-18 14:46:54 8
this toggles mute on the Master channel of an alsa soundcard

I've had this as mute.sh in my ~/bin/ for some time.
This is sample output - yours may be different.
0

on="off"; off="on"; now=$(amixer get Master | tr -d '[]' | grep "Playback.*%" |head -n1 |awk '{print $7}'); amixer sset Master ${!now}

hans · 2009-02-25 09:03:08 8
Find all files <10MB and sum up their size

files
This is sample output - yours may be different.
0

i=0; for f in $(find ./ -size -10M -exec stat -c %s {} \; ); do i=$(($i + $f)); done; echo $i

dakira · 2010-01-08 15:47:35 3
Sniff ONLY POP3 authentication by intercepting the USER command

The command is useful for monitoring the use of the boxes and their connection IP. Result file "sniff" is readable with GUI program "wireshark" or through CLI with the command: tcpdump -f "sniff" -XX Show Sample Output
This is sample output - yours may be different.
```
USER username@maildomain.com
```
0

tcpdump -i eth0 "tcp port pop3 and ip[40] = 85 and ip[41] = 83" -s 1500 -n -w "sniff"

ironmarc · 2010-11-18 09:03:08 2
Convert a directory of pdfs into scaled down pngs

Using ghostscript instead of imagemagick to convert pdfs into pngs. It keeps pngs with pdfs
This is sample output - yours may be different.
0

shopt -s nullglob; for i in $(find "Your/file/system" -name "*.pdf"); do e="$(dirname $i)/$(basename $i '.pdf').png"; gs -sDEVICE=png16m -q -dPDFFitPage -g492x380 -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -dNOSUBSTDEVICECOLORS -o $e $i; done

unixmonkey15302 · 2010-12-17 13:30:54 5
Find .java files with high complexity (counting curly braces)
This is sample output - yours may be different.
0

find src/ -name "*.java" | while read f; do echo -n "$f "; cat "$f" | tr -dc '{}'; echo; done | awk '{ print length($2), $1 }' | sort -n

mindsocket · 2011-07-21 01:25:31 8
Create fortune's *.dat file from commandlinefu from saved preferite

Create fortune's *.dat file from commandlinefu from saved preferite script by suhasgupta (http://www.commandlinefu.com/commands/view/3681/backup-all-your-commandlinefu.com-favourites-to-a-plaintext-file) - Italian tutorial here: http://mrehqe.blogspot.com/2011/11/come-ottenere-un-commandlinefu-della.html
This is sample output - yours may be different.
0

sed ':a;N;$!ba;s/\n\n/\n%\n/g' input.txt >output

mrehqe · 2011-11-06 11:55:33 3
Nohup

After you execute a command (or shell script) in the background using &, if you logout from the session, the command will get killed. To avoid that, you should use nohup as shown below.
This is sample output - yours may be different.
0

nohup ./my-shell-script.sh &

ankush108 · 2012-06-26 19:43:42 74
Replace nelines with spaces
This is sample output - yours may be different.
0

sed -e :a -e '$!N;s/\n/ /;ta'

T4b · 2012-08-21 09:45:16 6
Pipe system log to espeak
This is sample output - yours may be different.
0

tail -f /var/log/messages.log | while read line ; do echo $line | cut -d \ -f5- | sed s/\\[[0-9]*\\]// | espeak ; done

asdfkajsdfh · 2012-10-27 23:00:53 4
Tar dir excluding tmp
This is sample output - yours may be different.
0

tar -zcvf <archive<.tar.gz --exclude /home/szimbaro/tmp /home/szimbaro

szimbaro · 2013-02-27 13:47:59 4
mount iso file
This is sample output - yours may be different.
0

mount -o loop centos.iso /nmt/dir

yangfeng724 · 2013-07-01 08:32:55 32
empty one file
This is sample output - yours may be different.
0

> filename.txt

hustlijian · 2013-12-06 09:12:00 16
Use wbinfo to output a table with basic user information from the default domain controller.

### for ADUSER in $(wbinfo -u --domain="$(wbinfo --own-domain)" | sort); do WBSEP=$(wbinfo --separator); ADUNAME=$(wbinfo -i "$ADUSER" | cut -d ":" -f5); UINFO=$(wbinfo -i "$ADUSER" | cut -d ":" -f3); GINFO=$(wbinfo -i "$ADUSER" | cut -d ":" -f4); SIDU=$(wbinfo -U "$UINFO"); SIDG=$(wbinfo -G "$GINFO"); USERID=$(wbinfo -s "$SIDU" | sed 's/.\{1\}$//' | cut -d "$WBSEP" -f2); GROUPID=$(wbinfo -s "$SIDG" | sed 's/.\{1\}$//' | cut -d "$WBSEP" -f2); echo -e "$ADUSER:$USERID:$ADUNAME:$GROUPID"; done | column -tx -s: ### Show Sample Output
This is sample output - yours may be different.
```
administrator     Administrator         Domain Admins
auditor           auditor               Domain Users
consultant1       Consultant 1          Domain Users
consultant2       Consultant 2          Domain Users
guest             Guest                 Domain Guests
krbtgt            krbtgt                Domain Users
scanmgr           scanmgr               Domain Admins
skillcheck        Skill Check           Domain Users
```
0

for DOMAIN in $(wbinfo -m); do WBSEP=$(wbinfo --separator); ADSERVER=$(wbinfo ... (Read description for full command)))

jaimerosario · 2014-06-13 21:03:23 8
alias that copies text into clipboard and clears clipboard after X seconds

This alias is useful if you need to use some text often. Executing the alias will copy the text into your clipboard and then remove it after X seconds. Show Sample Output
This is sample output - yours may be different.
```
No output
```
0

alias lp="echo -n \"some text to copy\" | pbcopy; sleep 120 && echo -n \"done\" | pbcopy &"

wsams · 2014-10-05 19:43:49 8
Resize and compress jpg images to another path with mogrify
This is sample output - yours may be different.
0

find /media/mmc/ -iname "*.JPG" -exec mogrify -quality 75 -resize '800x600' -path ~/Temp/ {} \;

chrisv · 2015-01-19 10:08:38 8
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Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Get a free shell account on a community server

Bash process substitution which curls the website 'hashbang.sh' and executes the shell script embedded in the page. This is obviously not the most secure way to run something like this, and we will scold you if you try. The smarter way would be: Download locally over SSL > curl https://hashbang.sh >> hashbang.sh Verify integrty with GPG (If available) > gpg --recv-keys 0xD2C4C74D8FAA96F5 > gpg --verify hashbang.sh Inspect source code > less hashbang.sh Run > chmod +x hashbang.sh > ./hashbang.sh

Ignore a directory in SVN, permanently

This command allow you to ignore certain directories on SVN commands, like SVN STATUS. It is sad see a lot of temporary files from templates_c for each "svn status", no? ;-) This works only on directories under revision control.

Readd all files is missing from svn repo

When working on a big proeject with SVN, you create quite much files, for now! Can just sit here and type svn add for all of them! svn status will return a list of all of file which get ?(not add), "M"(Modified), "D"(Deleted)! This code just grep "?" flag, then add it into SVN again!

Find usb device in realtime

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

Show all listening and established ports TCP and UDP together with the PID of the associated process

Easy to remenber. Fot TCP only use: netstat -plant

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

rsync over ssh via non-default ssh port

tested on cygwin and Fedora 9 . good to remember for those jobs where you cannot set a site-specific connect option in your ~/.ssh/config file.

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

list block devices

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

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