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archlinux: remove a package completely from the system

Removes the package, 'packagename' in the example ,from your system. '-R' is the actual removal option, 'n' is for removing backup configuration files saved by pacman, and 's' is for removing the dependencies of the given package which are not required by other packages. pacman does not remove configuration files, etc. created by the package.
This is sample output - yours may be different.
-1

sudo pacman -Rns packagename

newnumber · 2017-06-20 12:14:03 17

To find how Apache has been compiled from commandline

To get information at your fingertips about Apache compilation. Show Sample Output

-1

httpd2 -V

unixbhaskar · 2009-08-29 13:04:37 3

Compressed Backup of the /etc

Simple Compressed Backup of the /etc Linux compatible
This is sample output - yours may be different.
-1

tar jcpf /home/[usuario]/etc-$(hostname)-backup-$(date +%Y%m%d-%H%M%S).tar.bz2 /etc

mack · 2011-04-29 22:53:11 4
dd if=/dev/null of=/dev/sda

Exactly the same effect with 3 less characters ;-) (Removes all files/filesystems of a harddisk. It removes EVERYTHING of your hard disk. Be careful when to select a device.) You can press Ctrl + C after few seconds (No output)
This is sample output - yours may be different.
-1

cat /dev/zero > /dev/sda

fhh · 2013-09-13 21:47:48 7
Check your unread Gmail from the command line
This is sample output - yours may be different.
-1

mtr www.google.com

slu4aen · 2014-10-08 06:55:32 9
Reorder file with max 100 file per folder

If you have a folder with thousand of files and want to have many folder with only 100 file per folder, run this. It will create 0/,1/ etc and put 100 file inside each one. But find will return true even if it don't find anything ... Show Sample Output
This is sample output - yours may be different.
```
Nothing but files and folder
```
-1

folder=0;mkdir $folder; while find -maxdepth 1 -type f -exec mv "{}" $folder \; -quit ; do if [ $( ls $folder | wc -l ) -ge 100 ]; then folder=$(( $folder + 1 )); mkdir $folder; fi ; done

Juluan · 2011-02-11 21:28:01 4
Edit all source files of project with vim, each on separate tab
This is sample output - yours may be different.
-1

vim -p `ls *.java *.xml *.txt *.bnd 2>/dev/null`

yababay · 2011-06-11 20:15:08 3

check open ports (both ipv4 and ipv6)

This option selects the listing of all Internet and x.25 (HP-UX) network files. Show Sample Output

-1

lsof -i

shsingh · 2011-10-03 02:06:30 3

ssh hostchange know_host improver

If you work in an environment, where some ssh hosts change regularly this might be handy...
This is sample output - yours may be different.
-1

sshostnew () {sed -i "$1d" $HOME/.ssh/known_hosts ; }

_john · 2011-11-07 10:33:04 10
displays a reminder message at the specified time
This is sample output - yours may be different.
-1

echo "DISPLAY=$DISPLAY xmessage convert db to innodb" | at 00:00

op4 · 2010-02-04 04:02:35 4
Colored cal output

Colors a the current date in cal output Show Sample Output
This is sample output - yours may be different.
```
     April 2011
Su Mo Tu We Th Fr Sa
                1  2
 3  4  5  6  7  8  9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
```
-1

cal | sed -E "2,8s/(^|[^0-9])($(date +%e))( |$)/\1$(echo "\033[0;36m\2\033[0m")\3/g"

iridium172 · 2011-04-30 03:16:31 56
Ignore ~/.vimrc when startup gVim
This is sample output - yours may be different.
-1

gvim -u NONE -U NONE

kev · 2011-06-12 10:56:14 3
Show internet IP Address in prompt --> PS1 var
This is sample output - yours may be different.
-1

export PS1="[\u@`curl icanhazip.com` \W]$ "

peshay · 2011-11-07 14:48:16 7
Grab your bibtex file from CiteULike.

I love CiteULike. It makes keeping a bibtex library easy and keeps all my papers in one place. However, it can be a pain when I add new entries and have to go through the procedure for downloading the new version in my browser, so I made this to grab it for me! I actually pipe it directly into a couple of SED one liners to tidy it up a bit too. Extremely useful, especially if you make a custom BibTeX script that does this first. That way you can sort a fresh BibTeX file for each new paper with no faf. To use just replace with your CiteULike user name. It doesn't download entries that you've hidden but I don't use that feature anyway.
This is sample output - yours may be different.
-1

curl -o <bibliography> "http://www.citeulike.org/bibtex/user/<user>"

qubyte · 2009-03-26 23:08:14 6
get users process list
This is sample output - yours may be different.
-1

ps -u<user>

sathyz · 2009-09-16 05:24:41 3
Get all the HTTP HEAD responses from a list of urls in a file

urls.txt should have a fully qualified url on each line prefix with rm log.txt; to clear the log change curl command to curl --head $file | head -1 >> log.txt to just get the http status Show Sample Output
This is sample output - yours may be different.
```
==log.txt:==
/downloads HTTP/1.1 301 Moved Permanently
/downloads/ HTTP/1.1 404 Not Found
/downloads/downloads/press/logos.zip HTTP/1.1 200 OK
```
-1

for file in `cat urls.txt`; do echo -n "$file " >> log.txt; curl --head $file >> log.txt ; done

Glutnix · 2010-10-19 02:54:13 5
Start a Google Chrome profile with an X11 based interactive prompt

Simple Google Chrome profile manager using zenity for profile name input. Place this in a shell script and then use the path to it as the command field in a gnome/kde shortcut. When you start it you will be prompted for a profile to use, if you leave it blank you should get the default profile. Show Sample Output
This is sample output - yours may be different.
```
This is interactive in X11.
```
-1

/opt/google/chrome/google-chrome --user-data-dir=$HOME/.config/google-chrome/`zenity --entry --text="Enter a profile name:"`

gml · 2011-01-06 19:41:45 5
bulk rename files with sed, one-liner
This is sample output - yours may be different.
-1

ls | sed 'p;s/foo/bar/' | xargs -n2 mv

pkufranky · 2011-04-30 10:56:35 3
Rip CD

Can be useful to rip a CD. Show Sample Output
This is sample output - yours may be different.
```
function ripcd {
	ripit -c 0 --outputdir $1 --nosubmission
}
```
-1

ripit -c 0 --outputdir $1 --nosubmission

UnixNeko · 2011-06-12 12:29:26 3
Show git branches by date - useful for showing active branches

simple table
This is sample output - yours may be different.
-1

for k in `git branch -r|awk '{print $1}'`;do echo -e `git show --pretty=format:"%Cgreen%ci_%C(blue)%c r_%Cred%cn_%Creset" $k|head -n 1`$k;done|sort -r|awk -F"_" '{printf("%s %17s %-22s %s\n",$1,$2,$3,$4)}'

varon · 2012-10-29 12:38:24 6
Write a bootable Linux .iso file directly to a USB-stick (macOS edition)

Some of us have both Macs *and* Linux machines — so it makes sense to know how to run this command on the former in the event that a botched reinstallation renders the latter unbootable.
This is sample output - yours may be different.
-1

sudo curl -L -o /dev/disk4 https://some-distributor.org/some-distro.iso

realkstrawn93 · 2022-06-20 17:25:39 849
SVN Add Recursively

This adds all new files to SVN recursively. It doesn't work for files that have spaces in their name, but why would you create a file with a space in its name in the first place?
This is sample output - yours may be different.
-1

svn status | grep "^\?" | awk '{print $2}' | xargs svn add

unixfu73000 · 2009-03-12 15:06:12 8
Make an iso file out of your entire hard drive

Similar.
This is sample output - yours may be different.
-1

dd if=/dev/hda of=file.img

yooreck · 2009-11-09 16:05:17 5
Find out my commits today in svn
This is sample output - yours may be different.
-1

svn log | grep "$LOGNAME" | grep `date '+%Y-%m-%d'`

jimthunderbird · 2010-04-07 22:12:12 7
Convert all tabs in a file to spaces, assuming the tab width is 2

Change the number to change the number of spaces. Leaving it out defaults to 8. Leaving out the filename defaults to stdin. And to do it in reverse, you can use the unexpand command.
This is sample output - yours may be different.
-1

expand -t 2 <filename>

camocrazed · 2010-07-13 23:04:57 3
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Get a range on line with sed (first two)

Get the two first lines of a file and quit.

embed referred images in HTML files

in "a.html", find all images referred as relative URI in an HTML file by "src" attribute of "img" element, replace them with "data:" URI. This useful to create single HTML file holding all images in it, as a replacement of the IE-created .mht file format. The generated HTML works fine on every other browser except IE, as well as many HTML editors like kompozer, while the .mht format only works for IE, but not for every other browser. Compare to the KDE's own single-file-web-page format "war" format, which only opens correctly on KDE, the HTML file with "data:" URI is more universally supported. The above command have many bugs. My commandline-fu is too limited to fix them: 1. it assume all URLs are relative URIs, thus works in this case: $ but does not work in this case: $ This may not be a bug, as full URIs perhaps should be ignored in many use cases. 2. it only work for images whoes file name suffix is one of .jpg, .gif, .png, albeit images with .jpeg suffix and those without extension names at all are legal to HTML. 3. image file name is not allowed to contain "(" even though frequently used, as in "(copy of) my car.jpg". Besides, neither single nor double quotes are allowed. 4. There is infact a big flaw in this, file names are actually used as regular expression to be replaced with base64 encoded content. This cause the script to fail in many other cases. Example: 'D:\images\logo.png', where backward slash have different meaning in regular expression. I don't know how to fix this. I don't know any command that can do full text (no regular expression) replacement the way basic editors like gedit does. 5. The original a.html are not preserved, so a user should make a copy first in case things go wrong.

Get the next weekday for an 'at' command

Line can be modified as needed. This considers weekdays to be Mon-Fri. If run any working day it'll provide a parameters for the next working day for "at". "beep" provided as a sample command. This can be modified easily to include wait time. If you need something to run "D" days after today: # D=4;if [ $(date +%u --date="${D} days") -lt 5 ];then AT="+${D} days";else AT="next monday";fi; echo "beep" | at noon ${AT}

find text in a file

this will find text in the directory you specify and give you line where it appears.

move you up one directory quickly

Alias a single character 'b' to move to parent directory. Put it into your .bashrc or .profile file. Using "cd .." is one of the most repetitive sequence of characters you'll in the command line. Bring it down to two keys 'b' and 'enter'. It stands for "back" Also useful to have multiple: alias b='cd ../' alias bb='cd ../../' alias bbb='cd ../../../' alias bbbb='cd ../../../../'

tail, with specific pattern colored

Assign function keys to your frequent commands

This is a common use of bind. Hitting any key after will output the key's character sequence. This makes possible using it into a bind command. So pressing ctrl+v and then F2 will output "^[[12~", once binded every time you'll press the function key F2 it will execute your command. Added the \n to make it execute it as well.

Hide files in ls, by adding support for .hidden files!

Sometimes I would like to see hidden files, prefix with a period, but some files or folders I never want to see (and really wish I could just remove all together).

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"

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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