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What is my ip?
This is sample output - yours may be different.
-2

lynx --dump "http://checkip.dyndns.org"

lmascarenhas · 2009-10-26 01:26:33 3
What is my ip?

See external ip with w3m, simple and fast. On a web site from Chile (spanish).
This is sample output - yours may be different.
-2

w3m miip.cl | grep ip

Cont3mpo · 2009-10-26 01:40:37 4
A little bash daemon =)

You don't want the -ar parameters in this case. The man page for BASH_BUILTINS(1) states: "-a option means to remove or mark all jobs" and "-r option without a jobspec argument restricts operation to running jobs" In this case we are supplying the process id of the job to disown so neither of these should be used.
This is sample output - yours may be different.
-2

echo "Starting Daemon"; ( while :; do sleep 15; echo "I am still running =]"; done ) & disown -h $!

daleki · 2010-02-23 19:17:05 3
Generate an XKCD #936 style 4 word password

The first grep rejects capitalised words since the dict has proper nouns in it that you mightn't want to use. The second grep rejects words with ending in apostrophe s, and the third forces the words to be at least 15 characters long. Show Sample Output
This is sample output - yours may be different.
```
counterproductive unreasonableness multimillionaires extemporaneously
```
-2

cat /usr/share/dict/words | grep -P ^[a-z].* | grep -v "'s$" | grep -Pv ^.\{1,15\}$ | shuf -n4 | tr '\n' ' ' | sed 's/$/\n/'

bugmenot · 2011-08-15 01:03:48 6
What is my ip?

See more details at http://blog.amit-agarwal.co.in/2008/12/01/get-you-ip-address-like-whatismyipcom/ Show Sample Output
This is sample output - yours may be different.
```
122.167.6.97
```
-2

w3m http://amit-agarwal.co.in/mystuff/getip_txt.php will return the ip in text format.

raj77_in · 2009-10-26 02:24:46 4
Burn an ISO on commandline with wodim instead cdrecord
This is sample output - yours may be different.
-2

wodim foo.iso

SlimG · 2010-02-23 21:58:31 3
Show live HTTP requests being made on OS X

Replace "en1" with your network interface (on OS X, usually en0, en1, eth0, etc..) Show Sample Output
This is sample output - yours may be different.
```
GET /services/rest/news/new/?stamp=1238809183049 HTTP/1.1
Host: www.qbn.com
GET / HTTP/1.1
Host: news.bbc.co.uk
GET /services/rest/news/new/?stamp=1238809185049 HTTP/1.1
Host: www.qbn.com
```
-2

sudo tcpdump -i en1 -n -s 0 -w - | grep -a -o -E "Host\: .*|GET \/.*"

peterc · 2009-04-04 01:41:48 8
Renames all files in the current directory such that the new file contains no space characters.
This is sample output - yours may be different.
-2

rename 's/ /_/g' *

twjolson · 2011-07-04 06:21:27 4
Unmount all mounted SAMBA/Windows shares

smbfs or cifs, depends on which you are using
This is sample output - yours may be different.
-2

umount -t smbfs

Velenux · 2012-02-23 10:46:44 3
Search through files, ignoring .svn

Variant of find grep that ignores files with .svn in the name. Useful for searching through a local repository of source code.
This is sample output - yours may be different.
-2

find . -type f -print0 | grep -vzZ '.svn' | xargs -0 grep --color -nEHi "SEARCHTERM"

troelskn · 2009-02-05 10:27:15 39
gzip vs bzip2 at compressing random strings?

Does that count as a win for bzip2? Show Sample Output
This is sample output - yours may be different.
```
$ \ls -l out*
-rw-r--r-- 1 chillu users 789711 2009-04-04 19:01 out.bz
-rw-r--r-- 1 chillu users 789947 2009-04-04 19:01 out.gz
```
-2

< /dev/urandom tr -dc A-Za-z0-9_ | head -c $((1024 * 1024)) | tee >(gzip -c > out.gz) >(bzip2 -c > out.bz) > /dev/null

jnash · 2009-04-04 13:23:01 11
What Type of Computer Do You Have?

Prints the type of computer you have. I think this should be used more in distros and other applications because it is so easy to get. This can also be asked by tutorials as an easy way to get your base hardware. Some alternatives: sudo dmidecode -s system-product-name and sudo smbios-sys-info-lite | sed -n 's/^Product Name: *$.*$/\1/p' Show Sample Output
This is sample output - yours may be different.
```
Pangolin Performance
```
-2

cat /sys/devices/virtual/dmi/id/board_name

matthewbauer · 2010-04-22 03:21:40 9
Find MAC address of Active Eth connection
This is sample output - yours may be different.
-2

/sbin/ifconfig|grep -B 1 inet |head -1 | awk '{print $5}'

octopus · 2010-04-22 06:35:29 6
Rezip a bunch of files

I used this because I needed to sort the content of a bunch of gzipped log files. Replace sort with something else, or simply remove sort to just rezip everything
This is sample output - yours may be different.
-2

find . -name "*.gz" | xargs -n 1 -I {} bash -c "gunzip -c {} | sort | gzip -c --best > {}.new ; rm {} ; mv {}.new {}"

kennethjor · 2009-08-05 14:16:15 7
Quickly re-launch your script (python for example)

Very useful for test a script. After launch this command, you only have to press ENTER for launch your script again. I work with screen and tape ENTER instead of '!!'+ENTER If you break your script with CTRL-C, it will wait for press ENTER and will re-launch You can write like it : while read -p "Press ENTER" ; do python ; done
This is sample output - yours may be different.
-2

while read ; do python <script> ; done

Zulu · 2012-02-23 22:29:09 10
List all password hashes
This is sample output - yours may be different.
-2

cat /etc/shadow

dsetton · 2014-02-01 19:48:05 6
Which processes are listening on a specific port (e.g. port 80)
This is sample output - yours may be different.
-2

netstat -nap|grep 80|grep LISTEN

bakhru · 2019-07-28 01:08:45 211
Get your IP addresses

This is what we use. You can grep -v 127.0.0.1 if you wish.
This is sample output - yours may be different.
-2

ifconfig | grep -o "inet [^ ]*" | cut -d: -f2

dooblem · 2010-12-06 10:36:52 5
Alias to list all functions loaded into bash (that don't start with _). Also shows file it's defined in.

Should run anywhere that Bash works.. Your mileage may vary. Show Sample Output
This is sample output - yours may be different.
```
cclock                       206  /home/myuser/.functions.sh
chmodd                       236  /home/myuser/.functions.sh
chmodf                       242  /home/myuser/.functions.sh
cmdfu                        41   /home/myuser/.functions.sh
command_not_found_handle     58   /etc/bash.bashrc
dequote                      148  /usr/share/bash-completion/bash_completion
dmesg_with_human_timestamps  252  /home/myuser/.functions.sh
```
-2

alias functions='shopt -s extdebug;declare -F | grep -v "declare -f _" | declare -F $(awk "{print $3}") | column -t;shopt -u extdebug'

goeltzec · 2021-11-22 06:49:36 421
Find files and list them sorted by modification time

List all files from the current directory and subdirectories, sorted by modification time, oldest first.
This is sample output - yours may be different.
-2

find . -type f -exec ls -tr {} +

goodevilgenius · 2010-05-27 14:52:28 6
cmatrix

apt-get install cmatrix cmatrix-xfont wmctrl transset-df Need to restart computer for mtx font to work Commands while cmatrix is running: 1 - 9 = Change speed SHIFT + 1 - 7 = change colors Q = Quit Tested in Ubuntu 10.04
This is sample output - yours may be different.
-2

xterm +u8 -fn mtx -maximized -T "There is no spoon!" -e cmatrix -bxa -u 3 & sleep .1s && wmctrl -r :ACTIVE: -b add,fullscreen && transset-df -a &

bugmenot · 2012-09-28 04:46:28 12
Append output to the beginning of a file.

Adds the stdout (standard output) to the beginning of logfile.txt. Change "command" to whatever command you like, such as 'ls' or 'date', etc. It does this by adding the output to a temporary file, then adding the previous contents of logfile.txt to the temp file, then copying the new contents back to the logfile.txt and removing the temp file.
This is sample output - yours may be different.
-2

command > tmp && cat logfile.txt >> tmp && tmp > logfile.txt && rm tmp

akoumjian · 2009-04-05 22:00:32 12
Go to end of current command line
This is sample output - yours may be different.
-2

CTRL + e

hardest · 2009-03-23 16:42:10 10
kill all instances of an annoying or endless, thread-spawning process
This is sample output - yours may be different.
-2

ps auxwww | grep outofcontrolprocess | awk '{print $2}' | xargs kill -9

unixmonkey8311 · 2010-06-30 15:52:52 6
Programmatically partition a new disk with fdisk
This is sample output - yours may be different.
-2

(echo n; echo p; echo 3; echo 1; echo; echo; echo w; echo q) | /sbin/fdisk /dev/sda

tsener · 2014-12-04 14:57:28 9
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Burst a Single PDF Document into Single Pages and Report its Data to doc_data.txt

Require the pdftk package It ll split each page in your pdf file , into a new pdf file and report info on doc_data.txt

Backup all MySQL Databases to individual files

Backs up all databases, excluding test, mysql, performance_schema, information_schema. Requires parallel to work, install parallel on Ubuntu by running: sudo aptitude install parallel

monitor the last command run

Prints new content of files

Useful to e.g. keep an eye on several logfiles.

count the number of specific characters in a file or text stream

In this example, the command will recursively find files (-type f) under /some/path, where the path ends in .mp3, case insensitive (-iregex). It will then output a single line of output (-print0), with results terminated by a the null character (octal 000). Suitable for piping to xargs -0. This type of output avoids issues with garbage in paths, like unclosed quotes. The tr command then strips away everything but the null chars, finally piping to wc -c, to get a character count. I have found this very useful, to verify one is getting the right number of before you actually process the results through xargs or similar. Yes, one can issue the find without the -print0 and use wc -l, however if you want to be 1000% sure your find command is giving you the expected number of results, this is a simple way to check. The approach can be made in to a function and then included in .bashrc or similar. e.g. $ count_chars() { tr -d -c "$1" | wc -c; } In this form it provides a versatile character counter of text streams :)

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" }

Find the package that installed a command

I finally found out how to use notify-send with at or cron

The simplest way to do it. Works for me, at least. (Why are the variables being set?)

Counts number of lines (in source code excluding comments)

I took java to make the find command simpler and to state that it works for any language supported by cpp. cpp is the C/C++ preprocessor (interprets macros, removes comments, inserts includes, resolves trigraphs). The -fpreprocessor option tells cpp to assume the input has already been preprocessed so it will only replace comment lines with blank lines. The -L 1 option tells xargs to launch one process for each line, indeed cpp can only process one file at the time...

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"

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