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Merge ( directories [looking for improvement]

Using a GUI file managers you can merge directories (cut and paste). This command roughly does the same (it doesn't ask for confirmation (no problem for me) and it doesn't clean up the empty SRC directories (no problem, trivial). probably does the same: cp -l SRC TARGET; rm -rf SRC
This is sample output - yours may be different.
0

(cd SRC; find . -type d -exec mkdir TARGET/{} ";"; find . -type f -exec mv {} TARGET/{} ";")

karel1980 · 2009-08-17 12:35:48 11
60 second on screen timer for bash scripts
This is sample output - yours may be different.
0

i=60;while [ $i -gt 0 ];do if [ $i -gt 9 ];then printf "\b\b$i";else printf "\b\b $i";fi;sleep 1;i=`expr $i - 1`;done

barnesmjsa · 2011-09-08 18:14:48 3
cat without comments

cat without comments
This is sample output - yours may be different.
0

cat /etc/squid/squid.conf | grep -v '^#' | sed '/^$/d'

Bafus · 2012-01-03 08:18:07 14
revert the unstaged modifications in a git working directory
This is sample output - yours may be different.
0

git diff | git apply --reverse

samer · 2012-05-15 22:36:33 3
Change wallpaper random

Change your Desktop background/wallpaper with feh lightweight command. fill background directory with appropriate content.
This is sample output - yours may be different.
0

feh --bg-scale "`ls -d $HOME/backgrounds/* |sort -R |tail -1`"

bertatum · 2013-03-16 16:05:48 5
Force a kernel panic

Well, this is quite useful for testing if your hardware watchdog is working properly.
This is sample output - yours may be different.
0

echo c > /proc/sysrq-trigger

fangfufu · 2013-05-07 19:41:40 6
Split an image in half for use on dual screens (mostly for use under KDE which treats each screen separately)

Output should be two JPG files named like "output-1.jpg" and "output-2.jpg". The convert command is part of ImageMagick so you'll need that and dependent packages installed to use it.
This is sample output - yours may be different.
0

convert yourdoublewideimage.jpg -crop 50%x100% +repage output.jpg

pagesix1536 · 2014-01-15 15:34:41 8
Create a git commit with no message

This is especially useful for adding changes to a temporary repo, such as a Gist. Avoid using this when collaborating with others.
This is sample output - yours may be different.
0

git commit --allow-empty-message --message ""

nicolasmccurdy · 2014-07-16 02:06:39 15
Daemonize Node.js apps and ease your system administration workflow

I'm the author of PM2 and wrote this tool, and I'm please to share it here. Github project link: https://github.com/Unitech/pm2 Show Sample Output
This is sample output - yours may be different.
```
Success true.
```
0

pm2 start app.js

strzel_a · 2014-11-07 23:15:12 10
Live stream a remote video device over ssh using ffmpeg

Change bitrate with option '-b'
This is sample output - yours may be different.
0

ssh user@host ffmpeg -b 200 -an -f video4linux2 \ -s 960x720 -r 10 -i /dev/video0 -b 200 -f ogg - \ | mplayer - -idle -demuxer ogg

dkaliberda · 2015-02-27 19:05:26 8
check open ports without netstat or lsof

Order and uniq
This is sample output - yours may be different.
0

declare -a array=($(tail -n +2 /proc/net/tcp | cut -d":" -f"3"|cut -d" " -f"1")) && for port in ${array[@]}; do echo $((0x$port)); done | sort | uniq

lucasjr76 · 2016-08-19 03:20:59 18
create video from image series
This is sample output - yours may be different.
0

ffmpeg -f image2 -r 15 -i pic.%04d.png -r 15 -b:v 8M vid15.avi

ceddi · 2016-10-17 19:50:16 17
Download a zipped file and extract it in one line

The example uses hashicorps packer as the sample file, but any .zip file which only contains a single file will work. Show Sample Output
This is sample output - yours may be different.
```
packer
```
0

curl -Ss https://releases.hashicorp.com/packer/1.0.0/packer_1.0.0_linux_amd64.zip | zcat > packer

hvindin · 2017-04-25 22:03:11 21
Print all git repos from a user

Python is installed on many boxes (in case you could not afford installing jq).
This is sample output - yours may be different.
0

curl -s "https://api.github.com/users/<username>/repos?per_page=1000" | python <(echo "import json,sys;v=json.load(sys.stdin);for i in v:; print(i['git_url']);" | tr ';' '\n')

grault · 2019-12-07 10:49:58 106
One liner gdb attach to Acrobat
This is sample output - yours may be different.
0

(acroread &);sleep 2;gdb /opt/Adobe/Reader8/Reader/intellinux/bin/acroread `pidof ld-linux.so.2`

rhythmx · 2009-04-29 16:23:48 11
Calculator on the go

Handy use of bc in the command line. No need to get 'into' the bc to perform calculations Show Sample Output
This is sample output - yours may be different.
```
# echo 2+3 |bc
5
```
0

echo 2+3 |bc

Kaio · 2009-07-04 22:03:41 12
List your largest installed packages (on Debian/Ubuntu)

List packages and their disk usage in decreasing order. This uses the "Installed-Size" from the package metadata. It may differ from the actual used space, because e.g. data files (think of databases) or log files may take additional space. Show Sample Output
This is sample output - yours may be different.
```
342348  netbeans-ide
231728  kdelibs4-doc
121332  comixcursors
108796  openoffice.org-core
[...]
```
0

perl -ne '$pkg=$1 if m/^Package: (.*)/; print "$1\t$pkg\n" if m/^Installed-Size: (.*)/;' < /var/lib/dpkg/status | sort -rn | less

hfs · 2009-10-19 12:55:59 7
shows the full path of shell commands
This is sample output - yours may be different.
0

type <command>

prayer · 2010-02-15 21:47:18 5
Find PHP files
This is sample output - yours may be different.
0

find . -name "*.php" -exec grep -i -H "search pharse" {} \;

wr8cr8 · 2010-07-22 11:54:45 17
Handling oracle alter log file
This is sample output - yours may be different.
0

awk '{if ($1~/Sun|Mon|Tue|Wed|Thu|Fri|Sat/) {DATE=$2" "$3" "$4" "$5 } else {print DATE"|"$0}}' alterorcl.log

hxre · 2010-11-26 01:40:58 4
Displays All TCP and UDP Connections
This is sample output - yours may be different.
0

sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep udp && echo && sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep tcp

brando56894 · 2011-09-08 18:54:36 3
Remove the first and the latest caracter of a string

Just an other solution :)
This is sample output - yours may be different.
0

echo foobar | sed -r 's/(^.|.$)//g'

ebraminio · 2011-11-19 16:19:07 3
Fast way to get the product of every number in a file
This is sample output - yours may be different.
0

(sed 's/^/x*=/' file ; echo x) | bc

fallen3angel · 2012-01-03 13:45:25 3
Display count of log entries via the previous minute for graphing purposes. Example given is for DHCPREQUESTS on an ISC dhcp service log.
This is sample output - yours may be different.
0

DATE=`date +"%H:%M" --date '-1 min'`; egrep "\ $DATE\:..\ " /var/log/dhcpd.log |awk '/DHCPREQUEST/ {split($3,t,":"); printf("%02d:%02d\n",t[1],t[2]);}' |uniq -c;

jobewan · 2013-03-17 02:23:37 5
Hex Dump
This is sample output - yours may be different.
0

hexdump -C file

qistoph · 2013-05-07 20:40:02 13
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Clear ARP table in linux.

Clears the "arp" table, without entering manually addresses (tested in Ubuntu).

Get the size of all the directories in current directory (Sorted Human Readable)

This allows the output to be sorted from largest to smallest in human readable format.

Decrypt passwords from Google Chrome and Chromium.

Read this before you down voting and comment that it is not working -> Wont work on latest versions ~75> since database file is locked and has to be decrypted. This is useful if you have an old hdd with a chrome installation and want to decrypt your old passwords fast.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

grep (or anything else) many files with multiprocessor power

xargs -P N spawns up to N worker processes. -n 40 means each grep command gets up to 40 file names each on the command line.

for newbies, how to get one line info about all /bin programs

Get simple description on each file from /bin dir, in list form, usefull for newbies.

Chrome sucks

Mouse Tracking

Will track your mouse and save it to a file. You can use gnuplot to graph it: $ gnuplot -persist

Set name of windows in tmux/byobu to hostnames of servers you're connected to

*I run this with byobu as as a custom status bar entry that runs every 10 seconds by putting it in a script here: $ .byobu/bin/10_update_windows There's no output to stdout, so nothing is displayed on the status bar. *Presumes that #{pane_title} is set to the hostname or prompt containing the host name. In my case, it's in this format: $ $USER@$HOSTNAME:$PWD The sed commands may need to be modified if your pane_title is different. *If you want to strip out a common part of a hostname, add the following before '| uniq' $ -e 's/[COMMON PART]//' I use that to strip out the domain of the servers I connect to, leaving the subdomain.

Easy way to scroll up und down to change to one of n last visited directories.

This alias is meant to append n (here is n=10) most recently used cd commands to the bottom of history file. This way you can easily change to one of previous visited directories simply by hitting 1-10 times arrow up key. Hint: You can make more aliases implying the same rule for any set of frequently used long and complex commands like: mkisof, rdesktop, gpg...

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