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snapshot partition for consistent backups with minimal downtime

(FreeBSD) Once you've made the snapshot you can resume any stopped services and then back up the file system (using the snapshot) without having to worry about changed files. When finished, the snapshot can be removed : umount /mnt mdconfig -d -u 1 rm /var/.snap/snap_var_`date "+%Y-%m-%d"`
This is sample output - yours may be different.
0

mksnap_ffs /var /var/.snap/snap_var_`date "+%Y-%m-%d"` ; mdconfig -a -t vnode -f /var/.snap/snap_var_`date "+%Y-%m-%d"` -u 1; mount -r /dev/md1 /mnt

bugmenot · 2010-09-18 11:37:03 4
Print a row of characters across the terminal

function for .bash_aliases that prints a line of the character of your choice in the color of your choice across the terminal. Default character is "=", default color is white.
This is sample output - yours may be different.
0

println() {echo -n -e "\e[038;05;${2:-255}m";printf "%$(tput cols)s"|sed "s/ /${1:-=}/g"}

joedhon · 2011-01-09 18:08:18 3
Create a QR code image in MECARD format

If your contact information was entered when your user account was created (it gets added to /etc/passwd) then this gets that info and creates a QR code for you automatically
This is sample output - yours may be different.
0

getent passwd $(whoami) | echo "$(perl -ne '/^([^:]+):[^:]+:[^:]+:[^:]+:([^ ]+) ?([^,]+)?,([^,]*),([^,]*),([^:,]*),?([^:,]*)/ and printf "MECARD:N:$3,$2;ADR:$5;TEL:$4;TEL:$6;EMAIL:$1@"')$HOSTNAME;;" | qrencode -o myqr.png

Strawp · 2011-07-25 12:59:57 3
Generate an XKCD #936 style 4 word passphrase (fast) w/o apostrophes

Fast and excludes words with apostrophes. For ubuntu, you can use wamerican or wbritish dictionaries, installable through aptitude. Show Sample Output
This is sample output - yours may be different.
```
speculation crazies sox heftier
restfuller geneticists overdo Georgina
chaises masseur procurer grab
```
0

echo $(cat /usr/share/dict/words |grep -v "'"|shuf -n4)

d1v3rdown · 2011-08-31 12:48:14 3
Lists all users in alphabetical order
This is sample output - yours may be different.
0

cut -d: -f1 /etc/passwd | sort

snaewe · 2011-12-20 11:50:13 3
Print all words in a file sorted by length

Take a file and ,."()?!;: give a list of all the words in order of increasing length. First of all use tr to map all alphabetic characters to lower case and also strip out any puntuation. A-Z become a-z ,."()?!;: all become \n (newline) I've ignored - (hyphen) and ' (apostrophe) because they occur in words. Next use bash to print the length ${#w} and the word Finally sort the list numerically (sort -n) and remove any duplicates (sort -u). Note: sort -nu performs strangely on this list. It outputs one word per length. Show Sample Output
This is sample output - yours may be different.
```
...
9 suggested
9 unsightly
10 advantages
10 categorise
10 considered
10 everything
12 experimental
12 grandparents
13 insignificant
13 self-assembly
14 apologetically
```
0

for w in $(tr 'A-Z ,."()?!;:' 'a-z\n' < sample.txt); do echo ${#w} $w; done | sort -u | sort -n

flatcap · 2012-03-15 14:14:11 5
Get your outside IP address - now with IPv6 support
This is sample output - yours may be different.
0

curl ip.tyk.nu

notion · 2012-05-02 10:36:08 3
Kill all processes belonging to a user

kill processes by user . Remove "i" if you don't want to confirm.
This is sample output - yours may be different.
0

fuser -kiu / name

jv2112 · 2012-08-28 09:48:48 4
SSH Autocomplete. Takes your history and creates ssh autocomplete using tab

Type the command. Then just use ssh command with tab to see all your ssh sessions. You can also put it in your profile. Thank you Nedzad !
This is sample output - yours may be different.
0

complete -W "$(echo $(grep '^ssh ' .bash_history | sort -u | sed 's/^ssh /\"/' | sed 's/$/\"/'))" ssh

bojan · 2012-11-02 15:14:15 4
Batch transcode .flac to .mp3 with gstreamer
This is sample output - yours may be different.
0

for i in *.flac; do gst-launch filesrc location="$i" ! flacdec ! audioconvert ! lamemp3enc target=quality quality=2 ! id3v2mux ! filesink location="${i%.flac}.mp3"; done

graphiclunarkid · 2013-03-07 22:07:40 4
Turn off your laptop screen on command
This is sample output - yours may be different.
0

xset dpms force off

nesses · 2013-04-26 21:30:10 7
Split the file into multiple files at every 3rd line
This is sample output - yours may be different.
0

awk 'NR%3==1{x="F"++i;}{print > x}' file3

conga · 2013-12-14 13:14:41 7

List the busiest script running on a cPanel server (showing domain)

List the busiest scripts/files running on a cPanel server with domain showing (column $12). Show Sample Output

/usr/bin/lynx -dump -width 500 http://127.0.0.1/whm-server-status | grep GET | awk '{print $12 $14}' | sort | uniq -c | sort -rn | head

copocaneta · 2014-03-12 13:24:40 8

calculate file as describe in one txt file

in test_file.txt: /var/img/1/368/ID_2012MTH03DT15.zip /var/img/1/368/ID_2012MTH03DT16.zip /var/img/1/368/ID_2012MTH03DT16N.zip /var/img/1/368/ID_2012MTH03DT16E.zip /var/img/1/368/ID_2012MTH03DT17M.zip /var/img/1/368/ID_2012MTH03DT17N.zip /var/img/1/368/ID_2012MTH03DT17E.zip /var/img/1/368/ID_2012MTH03DT18M.zip /var/img/1/368/ID_2012MTH03DT18N.zip /var/img/1/368/ID_2012MTH03DT19M.zip /var/img/1/368/ID_2012MTH03DT19N.zip /var/img/1/368/ID_2012MTH03DT19E.zip /var/img/1/368/ID_2012MTH03DT20M.zip /var/img/1/368/ID_2012MTH03DT20N.zip /var/img/1/368/ID_2012MTH03DT20E.zip /var/img/1/368/ID_2012MTH03DT21M.zip Show Sample Output
This is sample output - yours may be different.
```
4.4M    /var/img/1/368/ID_2012MTH03DT15.zip
3.8M    /var/img/1/368/ID_2012MTH03DT16.zip
3.9M    /var/img/1/368/ID_2012MTH03DT16N.zip
3.4M    /var/img/1/368/ID_2012MTH03DT16E.zip
3.8M    /var/img/1/368/ID_2012MTH03DT17M.zip
4.6M    /var/img/1/368/ID_2012MTH03DT17N.zip
2.9M    /var/img/1/368/ID_2012MTH03DT17E.zip
3.1M    /var/img/1/368/ID_2012MTH03DT18M.zip
3.8M    /var/img/1/368/ID_2012MTH03DT18N.zip
6.1M    /var/img/1/368/ID_2012MTH03DT19M.zip
4.4M    /var/img/1/368/ID_2012MTH03DT19N.zip
4.4M    /var/img/1/368/ID_2012MTH03DT19E.zip
4.3M    /var/img/1/368/ID_2012MTH03DT20M.zip
4.0M    /var/img/1/368/ID_2012MTH03DT20N.zip
4.2M    /var/img/1/368/ID_2012MTH03DT20E.zip
6.1M    /var/img/1/368/ID_2012MTH03DT21M.zip
67M     total
```
0

du -ch `cat test_file.txt`

mase · 2014-06-26 08:59:05 7
Dumpe2fs, FSck running

To check the total number of mounts, maximum number of mounts before performing the fsck and last time when the fsck was performed. Show Sample Output
This is sample output - yours may be different.
```
dumpe2fs 1.42.9 (28-Dec-2013)
Mount count:              11
Maximum mount count:      27
Last checked:             Thu Apr 10 22:38:46 2014
Check interval:           0 (<none>)
```
0

dumpe2fs -h /dev/xvda1 | egrep -i 'mount count|check'

manju712 · 2014-10-22 08:38:43 8
Replace + Find

This version works on OS X (if you have installed `rename`)
This is sample output - yours may be different.
0

find <mydir> -type f -exec rename 's/<string1>/<string2>/g' {} \;

thrifus · 2015-11-19 17:51:13 10
Get current position of the International Space Station in pulses of 1 second

Requires jq (JSON parser) and curl (wget could do the same with some changes)
This is sample output - yours may be different.
0

while true; do pos=$(curl -s "http://api.open-notify.org/iss-now.json"); echo "lat=$(echo $pos | jq ".iss_position.latitude"), lon=$(echo $pos | jq ".iss_position.longitude")"; sleep 1; done

TheMadScientist · 2016-01-08 16:32:34 10
generate hash for puppet
This is sample output - yours may be different.
0

mkpasswd -m sha-512

aysadk · 2017-07-13 07:11:23 27
Remove scripts tags from *.html and *.htm files under the current directory
This is sample output - yours may be different.
0

find ./ -type f $ -iname '*.html' -or -iname '*.htm' $ -exec sed -i '/<script/,/<\/script>/d' '{}' \;

mikhail · 2019-05-10 23:27:12 152
Remove metadata from pdf file (e.g. creation date)
This is sample output - yours may be different.
0

qpdf --pages source.pdf 1-z -- --empty clean-file.pdf

swarzynski · 2022-01-12 08:10:32 408
Substitution cipher

This is just for fun. Show Sample Output
This is sample output - yours may be different.
```
yOCvVO RBTb
```
0

echo "Decode this"| tr [a-zA-Z] $(echo {a..z} {A..Z}|grep -o .|sort -R|tr -d "\n ")

dennisw · 2009-09-18 06:38:28 36
Replace spaces in a filename with hyphens

Article mentions what each part of the command is responsible for. http://raymondcrandall.com/post/1360780719/easily-renaming-lots-of-files Show Sample Output
This is sample output - yours may be different.
```
A640 French painting seventeenth century front view.jpg

becomes

A640-French-painting-seventeenth-century-front-view.jpg
```
0

for f in * ; do mv "$f" $( echo $f | tr ' ' '-' ) ; done

RaymondCrandall · 2010-10-20 20:07:33 9
Convert KML to GPX w/ gpsbabel

Converts a single-track KML (Keyhole Markup Language) file to a GPX file. KML is the geospatial format of choice used by Google Earth, but doesn't interoperate with other GIS applications, websites, or devices ? almost all of which accept GPX.
This is sample output - yours may be different.
0

gpsbabel -i kml -f in.kml -o gpx -F out.gpx

tamasrepus · 2010-12-22 07:04:41 9
archlinux: shows which package created a given file

Shows the "parent" package of a given file. Show Sample Output
This is sample output - yours may be different.
```
yaourtrc is owned by yaourt 0.9.5.3-1
```
0

pacman -Qo /etc/yaourtrc

ibnarrashid · 2011-03-20 20:44:03 3
format txt as table not joining empty columns adding header with column numbers

This version now adds a header with consecutive numbering. Show Sample Output
This is sample output - yours may be different.
```
cat file.csv
column_a;column_b;column_c
a;b;c
;b;c
a;b;

cat file.csv | perl -pe 'if($. == 1) {@h = split(/;/); $i = 1 ; map { $_ = $i; $i++ } @h; print join(" ;", @h) , "\n"} ; s/(^|;);/$1 ;/g' | column -ts\;
1         2         3
column_a  column_b  column_c
a         b         c
          b         c
a         b
```
0

cat file.csv | perl -pe 'if($. == 1) {@h = split(/;/); $i = 1 ; map { $_ = $i; $i++ } @h; print join(" ;", @h) , "\n"} ; s/(^|;);/$1 ;/g' | column -ts\; | less -S

bashrc · 2011-08-31 12:52:02 4
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You need to install WWW::Mechanize Perl module with # cpan -i WWW::Mezchanize or by searching mechanize | grep perl in your package manager With this command, you can get forms, images, headers too

Youtube-dl gone stale on you/stopped working (Ubuntu)?

If you update youtube-dl from the repos, it becomes out-of-date quickly. Luckily, it can auto-update.

shell bash iterate number range with for loop

Bash's arithmetic evaluation.

Find usb device in realtime

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

Terminal redirection

can display the commands and their output to another user who is connected to another terminal, by example pts/3

full memcache client in under 255 chars (uses dd, sed and nc)

usage: mem memcache-command [arguments] where memcache-command might be: set add get[s] append prepend replace delete incr decr cas stats verbosity version notes: exptime argument is set to 0 (no expire) flags argument is set to 1 (arbitrary)

Simple Comment an entire file

With this simple sed command we can easily comment and entire file.

Install pip with Proxy

Installs pip packages defining a proxy

Change the window title of your xterm

If you are using an xterm emulation capable terminal emulator, such as PuTTY or xterm on Linux desktop, this command will replace the title of that terminal window. I know it is not nice to have seventeen terminals on your desktop with title PuTTY, you can not tell which one is connected to which server and doing what. Even though the string between the quotes is typed as literals, it needs a little more finesse to make it work. Here is how it is done key-by-key: echo "( ctrl-v then ctrl-[ )0;Enter_Title_String_Here( ctrl-v then ctrl-g )"( enter ) ctrl-v : means hold down ctrl key and hit v at the same time like you are pasting in windoze ; also please don't type the parentheses, i.e., ( and )

Lists installed kernels

no need for rpm, no need for piping to another command. also no real fu but lacking in unnecessary complexity and distro specific commands.

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