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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 17:25:39 842
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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list files recursively by size

clear the X clipboard

Clears your clipboard if xsel is installed on your machine. If your xsel is dumb, you can also use $xsel --clear --clipboard

Do a search-and-replace in a file after making a backup

sed already has an option for editing files in place and making backup copies of the old file. -i will edit a file in place and if you give it an argument, it will make a backup file using that string as an extension.

Makes the permissions of file2 the same as file1

same as the chmod example, but should also copy extended access control list attributes. deliberately stolen from: $man setfacl

Log the current memory statistics frequently to syslog

Uses logger in a while loop to log memory statistics frequently into the local syslog server.

Find the processes that are on the runqueue. Processes with a status of

Want to know why your load average is so high? Run this command to see what processes are on the run queue. Runnable processes have a status of "R", and commands waiting on I/O have a status of "D". On some older versions of Linux may require -emo instead of -eo. On Solaris: ps -aefL -o s -o user -o comm | egrep "^O|^R|COMMAND"

Print just line 4 from a textfile

Resume scp of a big file

It can resume a failed secure copy ( usefull when you transfer big files like db dumps through vpn ) using rsync. It requires rsync installed in both hosts. rsync --partial --progress --rsh=ssh $file_source $user@$host:$destination_file local -> remote or rsync --partial --progress --rsh=ssh $user@$host:$remote_file $destination_file remote -> local

Find the process you are looking for minus the grepped one

As an alternative to using an additional grep -v grep you can use a simple regular expression in the search pattern (first letter is something out of the single letter list ;-)) to drop the grep command itself.

Watch the progress of 'dd'

The previously-posted one-liner didn't work for me for whatever reason, so I ended up doing this instead.

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