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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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kill ip connection

needed; apt-get install tcpkill

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"

move a lot of files over ssh

Useful to move many files (thousands or millions files) over ssh. Faster than scp because this way you save a lot of tcp connection establishments (syn/ack packets). If using a fast lan (I have just tested gigabyte ethernet) it is faster to not compress the data so the command would be: tar -cf - /home/user/test | ssh user@sshServer 'cd /tmp; tar xf -'

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

shell function to make gnu info act like man.

I use this alias in my bashrc. The --vi-keys option makes info use vi-like and less-like key bindings.

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

prints line numbers

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" }

Sort movies by length, longest first

Sort .avi movies by time length, print the longest first, and so on...

Tunnel ssh through Socks Proxy

If you are blocked or need to use a Socks proxy

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