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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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Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Create thumbnails and a HTML page for listing them (with links to sources)

The input images are assume to have the "JPG" extension. Mogrify will overwrite any gif images with the same name! Will not work with names with spaces.

Download free e-books

Mask the user agent as firefox, recursively download 2 levels deep from a span host with a maximum of 1 redirection, use random wait time and dump all pdf files to myBooksFolder without creating any other directories. Host will have no way of knowing that this is a grabber script.

Get the full path of a bash script's Git repository head.

Rather than complicated and fragile paths relative to a script like "../../other", this command will retrieve the full path of the file's repository head. Safe with spaces in directory names. Works within a symlinked directory. Broken down: $cd "$(dirname "${BASH_SOURCE[0]}")" temporarily changes directories within this expansion. Double quoted "$(dirname" and ")" with unquoted ${BASH_SOURCE[0]} allows spaces in the path. $git rev-parse --show-toplevel gets the full path of the repository head of the current working directory, which was temporarily changed by the "cd".

Print every Nth line

Sometimes commands give you too much feedback. Perhaps 1/100th might be enough. If so, every() is for you. $ my_verbose_command | every 100 will print every 100th line of output. Specifically, it will print lines 100, 200, 300, etc If you use a negative argument it will print the *first* of a block, $ my_verbose_command | every -100 It will print lines 1, 101, 201, 301, etc The function wraps up this useful sed snippet: $ ... | sed -n '0~100p' don't print anything by default $ sed -n starting at line 0, then every hundred lines ( ~100 ) print. $ '0~100p' There's also some bash magic to test if the number is negative: we want character 0, length 1, of variable N. $ ${N:0:1} If it *is* negative, strip off the first character ${N:1} is character 1 onwards (second actual character).

Monitor bandwidth by pid

Nethogs is a useful tool for monitor bandwidth consumption by pid. Tested on Debian an CentOs

Print number of mb of free ram

This will show the amount of physical RAM that is left unused by the system.

need ascii art pictures for you readme text ?

Require boxes and / or cowsay packages. After input boxes -d dog , type your text and then press ctrl + d . Same goes for cowsay .

cycle through everything sox knows how to read, playing only the first three seconds

I wasted two hours reading the sox documentation and searching on the web for the format of some obscure fscking sound sample, and then finally came up with this. This plays only the first three seconds of your unknown formatted sound file using every one of sox's built-in filetypes. If you don't get an exact match, you may get close. . I could not fit every single type in and keep it under 127 characters, so you will have to replace "..." with the full list obtainable by `$ sox --help` (or try `Show sample output`) . note: /usr/bin/play should be linked to sox on most systems.

Reset hosed terminal,

stty sane resets the tty to basic usable function. The ^J is a newline -- sometimes CR/LF interpretation is broken so use the ^J explicitly.

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