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Wait the set time and then Power off

wait a hour and 10 seconds to shutdown Show Sample Output
This is sample output - yours may be different.
```
sudo shutdown -h 01:10
```
0

sudo shutdown -h <hour:minute>

devlucas · 2013-04-19 18:54:38 26
Wait for Web service to spin up, aka alert me when the server stops returning a 503

Show Sample Output
This is sample output - yours may be different.
```
OK: server is up.
OK: server is up.
OK: server is up.
```
0

while true; do curl -vsL -o /dev/null example.com 2>&1 | grep 503 > /dev/null || echo "OK: server is up."; sleep 8; done

noah · 2013-06-26 15:24:51 6
x11vnc store password
This is sample output - yours may be different.
0

x11vnc -storepasswd "password" ~/my_vnc_pass

sentenza · 2014-06-11 10:08:12 7
http://xat.com/VOLJENI_RADIO
This is sample output - yours may be different.
0

niki

NIKI · 2014-09-30 12:38:32 7

Save memory and typing when arrow searching through history

Appends 4 configuration lines to your ~/.inputrc which allow you to seach history taking into account the characters you have typed so far. It is taken straight form https://help.ubuntu.com/community/UsingTheTerminal Go there for a complete description (grep for "Incremental history searching"). Not sure about the limits of this (which OS's/terminals), but probably anything unix/linux like will do. Changed my life :) Show Sample Output

echo '\n"\e[A": history-search-backward\n"\e[B": history-search-forward\n"\e[C": forward-char\n"\e[D": backward-char\n' >> ~/.inputrc

temach · 2015-01-15 09:47:49 8

Decode a MIME message

Extract any ".zip" attachment from the e-mail.
This is sample output - yours may be different.
0

uudeview +e .zip -i mail.eml

MaxChinni · 2015-05-11 10:32:49 9
List widescreen wallpapers in current dir

Checks if the aspect ratio is approximately 1.6 (16:10) or ~1.77777778 (16:9). Requires mpv_identify from mpv project https://github.com/mpv-player/mpv/blob/master/TOOLS/mpv_identify.sh (this replaces mplayer -identify, or midentify) Show Sample Output
This is sample output - yours may be different.
```
video_aspect=1.778646
video_aspect=1.777778
```
0

./mpv_identify.sh * | egrep '^video_aspect=1\.[67]'

Tatsh · 2015-09-29 05:47:07 11
Remove all matches containing a string until its next space

Remove all arguments related to linux kernel from a list which uses space as item separator.
This is sample output - yours may be different.
0

sed 's/linux-[^ ]* \{0,1\}//g' /path/to/file

bugmenot · 2019-04-01 19:35:47 35
Check out Gate number for your flight from CLI with Chrome

Check out Gate number for your flight from CLI with Chrome, html2texgt and grep. Works on Arch Linux (Garuda) and probably will work on others. Requirements: * google chrome (might work with chromium as well) * installed html2text (on archlinux: sudo pacman -S python-html2text) * installed grep (comes by default with your OS) * the gate number should be visible at the given website (it's not existent too early before the flight and also disappears after the flight departed) Please don't forget to replace the link to appropriate one, matching your flight. You can also wrap this into something like `whlie true; do ...; sleep 60; done' and this will check and tell you the gate number maximum in 1 minute after it appears on Avinor website. Show Sample Output
This is sample output - yours may be different.
```
Gate

A14
```
0

google-chrome-stable --headless --dump-dom --disable-gpu "https://avinor.no/flight/?flightLegId=dy754-osl-trd-20220726&airport=OSL" 2>/dev/null | html2text | grep -A2 Gate

sxiii · 2022-07-26 11:50:59 403
Notify on Battery power

Works on Laptops, Desktop having communication b/w UPS & CPU Show Sample Output
This is sample output - yours may be different.
```
[On top right corner]

Running on BATTERY
```
0

NotifyOnBATTERY () { while :; do on_ac_power||notify-send "Running on BATTERY"; sleep 1m; done }

totti · 2011-08-26 11:54:16 7

build DTT channel list with w-scan

Use w_scan to build italian DTT video channel list. To change country, substitute IT with 2 letter country code. Userful to be played in vlc by: vlc -f dvb-channels.conf Show Sample Output

w_scan -X -P -t 2 -E 0 -c IT > dvb-channels.conf

mrehqe · 2011-11-04 11:17:31 7

Generate random sensible passwords, and copy them to the clipboard

Use the excellent sensiblepasswords.com to a generate random (yet easy-to-remember) password every second, and copy it to the clipboard. Useful for generating a list of passwords and pasting them into a spreadsheet. This script uses "madebynathan"'s "cb" function (http://madebynathan.com/2011/10/04/a-nicer-way-to-use-xclip/); you could also replace "cb" with xclip -selection c Remove "while true; do" and "; done" to generate and copy only 1 password. Show Sample Output
This is sample output - yours may be different.
```
Copied to clipboard: speedily702nixed
Copied to clipboard: rarities648toasting
Copied to clipboard: flunkies754inflect
Copied to clipboard: bogey202calves
^C
```
0

while true; do curl -s http://sensiblepassword.com/?harder=1 | tail -n 15 | head -n 1 | sed 's;<br/>;;' | cut -c 5- | cb; sleep 1; done

supervacuo · 2012-01-30 20:52:14 44
Marks all manually installed deb packages as automatically installed.

Marks all manually installed deb packages as automatically installed. Usefull to combine with apt-get install <all manually packages that we want> to have a clean installed debian-based system.
This is sample output - yours may be different.
0

aptitude -F "%p" search \!~M~i~T | xargs apt-mark markauto

gspadari · 2012-03-09 13:44:00 7
Suppress standard output using > /dev/null

This will be very helpful when you are debugging shell scripts, where you don?t want to display the echo statement and interested in only looking at the error messages. Similarly use 2> to supress error messages Show Sample Output
This is sample output - yours may be different.
```
Error messages only
```
0

cat file.txt > /dev/null

ankush108 · 2012-06-26 18:34:12 3
Make directory and change into immediately (No functions!)

Only requirement is bash shell. No functions needed. Show Sample Output
This is sample output - yours may be different.
```
[user@host tests]$ mkdir -p folder.d; \cd $_
[user@host folder.d]$
```
0

mkdir -p /path/to/folder.d; \cd $_

asphaltleopard · 2013-04-20 00:30:56 5
look some php code by some keywords

Another way to view some code by keyword and basic regular expression
This is sample output - yours may be different.
0

locate *\\.php|xargs grep --color=always -i -5 "namespace\s.*\W"|less

unixmonkey14859 · 2014-02-28 13:52:15 7
Start x11vnc session

Show Sample Output
This is sample output - yours may be different.
```
-nevershared shutdown any previous session before opening a new one
-forever = x11vnc still working after ending a session
```
0

x11vnc -many -rfbauth ~/.vnc_passwd -forever -nevershared

sentenza · 2014-06-11 10:09:54 7
Thread count by process, sorted + total

I occasionally need to see if a machine is hitting ulimit for threads, and what process is responsible. This gives me the total number, sorted low to high so the worst offender is at the end, then gives me the total number of threads, for convenience.
This is sample output - yours may be different.
0

(ps -U nms -o pid,nlwp,cmd:500 | sort -n -k2) && (ps -U nms -o nlwp | tail -n +2 | paste -sd+ | bc)

cmullican · 2014-09-30 18:25:56 9
Not able to data in tee on using dual command like: tail and grep
This is sample output - yours may be different.
0

tail -f log.txt | egrep --line-buffered 'WARN|ERROR' | tee filtered_output.txt

zarvis · 2015-09-29 11:12:52 9
quick livestream screencast

to view on another box: nc <server address> <port> | ffplay - use -r to adjust FPS and -q to adjust compression. use on trusted network only as nc is unencrypted.
This is sample output - yours may be different.
0

ffmpeg -f x11grab -s $(xrandr | awk '/*/ {print $1}') -r 10 -i :0 -an -q 10 -f mjpeg - | nc -lp <port>

misterhat · 2015-12-21 17:15:30 11
[MySQL] Get which table were dumped in [mysql_dump_file]

Show Sample Output
This is sample output - yours may be different.
```
table1 table2 table3 ...
```
0

cat [mysql_dump_file] | grep "Table structure" | cut -c 30- | tr '\n' ' ' | rev | cut -c 2- | rev | tr -d '`'

Lidorah · 2017-02-08 09:26:01 16
Get a virtual vCenter's root certificate

This will allow you to get the root certificate of a virtual vCenter appliance. Useful for when you need to make api calls, say with python, and you need to verify the ssl's certificate for the endpoint. Tested on vCenter 6.5.
This is sample output - yours may be different.
0

/usr/lib/vmware-vmafd/bin/vecs-cli entry list --store TRUSTED_ROOTS

solarsea · 2017-03-31 08:53:52 23

Find Duplicate Files (based on size, name, and md5sum)

It works extremely fast, because it calculates md5sum only on the files that have the same size and name. But there is nothing for free - it won't find duplicates with the different names. Show Sample Output

find -type f -printf '%20s\t%100f\t%p\n' | sort -n | uniq -Dw121 | awk -F'\t' '{print $3}' | xargs -d '\n' md5sum | uniq -Dw32 | cut -b 35- | xargs -d '\n' ls -lU

ant7 · 2017-05-21 02:26:16 16

Check if variable is a number

Using the standard numeric comparison but suppressing the STDERR output acts as the simplest way to check a value is numeric. See sample output for some examples. Show Sample Output
This is sample output - yours may be different.
```
$ export testnum=123
$ if [ "$testnum" -eq "$testnum" 2>/dev/null ]; then echo It is numeric; fi
It is numeric
$ [ "$testnum" -eq "$testnum" 2>/dev/null ] && echo It is numeric
It is numeric
$ export testnum=123xxx
$ if [ "$testnum" -eq "$testnum" 2>/dev/null ]; then echo It is numeric; fi
$ [ "$testnum" -eq "$testnum" 2>/dev/null ] && echo It is numeric
$ 
```
0

if [ "$testnum" -eq "$testnum" 2>/dev/null ]; then echo It is numeric; fi

jgc · 2009-10-09 14:57:27 9
Get current connected wireless network with nm-tools

Gets only when the state is connected.
This is sample output - yours may be different.
0

nm-tool 2>/dev/null|sed -n '/Type:[ ]*802.11 WiFi/,/IPv4 Settings/{ /State:[ ]*connected/,/IPv4 Settings/{ s/^[ ]*//;/^\*.*Infra/ { s/^*//;s/:.*//;p }}}'

chmouel · 2010-02-02 12:04:12 3
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Beep siren

Infinitely plays beeps with sinusoidally changing sound frequency. Ideal for alarm on an event.

Use the arguments used in the last command

Very basic, but who knows.. mkdir !$ should work too, only uses 'the last' argument. !-2 executes cd Desktop/Notes again. More tips in 'man history'

Get the SUM of visual blocked digits in vim

Protect directory from an overzealous rm -rf *

Forces the -i flag on the rm command when using a wildcard delete.

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"

Pulls email password out of Plesk database for given email address.

This simply pulls the password out of the database for the given mail name for ease of use in testing emails that you would not normally have access to.

Remove security limitations from PDF documents using ghostscript (for Windows)

#4345 also works under windows

Make .bashrc function to backup the data you changed last houres

The original overwrites any previous backups, and only saves exactly the last hours worth, but not 1 hour + 1 minute. This version creates or appends files, and backs up everything since the last backup (using the backups timestamp as the reference), plus it uses TMPDIR if set.

delay execution of a command that needs lots of memory and CPU time until the resources are available

[ 2000 -ge "$(free -m | awk '/buffers.cache:/ {print $4}')" ] returns true if less than 2000 MB of RAM are available, so adjust this number to your needs. [ $(echo "$(uptime | awk '{print $10}' | sed -e 's/,$//' -e 's/,/./') >= $(grep -c ^processor /proc/cpuinfo)" | bc) -eq 1 ] returns true if the current machine load is at least equal to the number of CPUs. If either of the tests returns true we wait 10 seconds and check again. If both tests return false, i.e. 2GB are available and machine load falls below number of CPUs, we start our command and save it's output in a text file. The ( ( ... ) & ) construct lets the command run in background even if we log out. See http://www.commandlinefu.com/commands/view/3115/ .

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.

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