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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 08:10:32 410
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 37
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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pdfcount: get number of pages in a PDF file

Create a tar file with the current date in the name.

Delete all files older than X in given path

This will find all files under the path "." which are older than 10 days, and delete them. If you wish to use the "rm" command instead, replace "-delete" with "-exec rm [options] {} \;"

What is my public IP address

It's easier then the listed command, I'm thinking. but doesn't matter much--its closer to personal preference really.

vmstat/iostat with timestamp

Also useful with iostat, or pretty much anything else you want timestamped.

Display the history and optionally grep

Place this in your .bash_profile and you can use it two different ways. If you issue 'h' on its own, then it acts like the history command. If you issue: $ h cd Then it will display all the history with the word 'cd'

Creates a 'path' command that always prints the full path to any file

The command creates an alias called 'path', so it's useful to add it to your .profile or .bash_profile. The path command then prints the full path of any file, directory, or list of files given. Soft links will be resolved to their true location. This is especially useful if you use scp often to copy files across systems. Now rather then using pwd to get a directory, and then doing a separate cut and paste to get a file's name, you can just type 'path file' and get the full path in one operation.

extract audio from flv to mp3

Insert a line at the top of a text file without sed or awk or bash loops

Yet another way to add a line at the top a of text file with the help of the tac command (reverse cat).

print a cpu of a process

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