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Monitor a log file, filling up all available space in the terminal window and preventing line wrap

This bash one-liner will let you watch the tail end of a log file in real time.
This is sample output - yours may be different.
0

watch -n 4 "tail -n $(expr $(tput lines) - 4) /var/log/apache2/access.log | cut -c 1-$(tput cols)"

atw527 · 2013-12-03 23:45:25 9
df without line wrap on long FS name

To be OS independent you should try df -Pk first (Linux) and if it does not work (that's the ||) then use df -k (e.g. for Solaris, HP UX, AIX). To get the output in a single line, use the additional cat.
This is sample output - yours may be different.
0

(df -Pk 2>/dev/null|| df -k) | cat

ffeldhaus · 2015-01-15 22:38:36 9
finds all bean ids in all xml files from the current folder

finds all xml files greps them for extracts the bean id sorts the ids creates a list of distinct entries, a unique list of bean ids Show Sample Output
This is sample output - yours may be different.
```
groupManager
groupPermissionsDelegate
groupPermissionsDelegate
handleResolver
hashRegistry
hazelcastCacheCompactor
hazelcastCacheConfigManager
```
0

find . -iname "*.xml" | xargs cat | grep '<bean[^>]\+id=' | sed 's/.*id="$[^"]\+$".*/\1/g' | sort | uniq -u

gruzilla · 2015-11-06 07:57:22 10
GRUB2: Set Imperial Death March as startup tune
This is sample output - yours may be different.
0

echo "GRUB_INIT_TUNE=\"480 440 4 440 4 440 4 349 3 523 1 440 4 349 3 523 1 440 8 659 4 659 4 659 4 698 3 523 1 415 4 349 3 523 1 440 8\"" | sudo tee -a /etc/default/grub > /dev/null && sudo update-grub

EvilSupahFly · 2015-12-22 06:22:30 9
get processid of running process

alternative to pidof command Show Sample Output
This is sample output - yours may be different.
```
12345
```
0

processid =$(ps aux | grep 'ProcessName' | grep -v grep| awk '{print $2}')

aysadk · 2017-05-21 19:52:12 17
Disk Free with column and Fs and Size human readble
This is sample output - yours may be different.
0

df -PhT

net0bsd · 2018-01-03 02:31:15 22
Add a newline to the end of a cpp file

Adds a newline to the end of all cpp files in the directory to avoid warnings from gcc compiler.
This is sample output - yours may be different.
0

find . -iname "*.cpp" -exec perl -ni -e 'chomp; print "$_\n"' {} \;

grundprinzip · 2009-02-18 14:12:24 7
Monitor a file's size

Got a file you're generating and you want the size without typing in 'ls -l file' all the time? Use this instead. Show Sample Output
This is sample output - yours may be different.
```
2380 messages
2396 messages
2401 messages
```
0

while [ 1 ]; do du /var/log/messages;sleep 60; done

savanik · 2009-10-09 17:22:19 3
Fetch the Gateway Ip Address

same thing without loop ;)
This is sample output - yours may be different.
0

/sbin/route -n | grep "^0\.0\.0\.0" | awk '{ print $2 }'

BorneBjoern · 2010-03-07 13:59:57 5
Converts uppercase chars in a string to lowercase

Another way to do it with slightly fewer characters. It doesn't work on Russian characters; please don't vote down because of that. :p It's very handy for those of us working in ascii :) Show Sample Output
This is sample output - yours may be different.
```
string
```
0

echo StrinG | tr 'A-Z' 'a-z'

randy909 · 2010-08-12 15:42:56 3
Comment out all lines in a configuration file matching a regexp, creating a backup.
This is sample output - yours may be different.
0

mv -i something.conf{,~} && sed "/regexp/s/^/#/" < something.conf~ > something.conf

jasonjgw · 2010-11-18 00:10:45 4
replace one of the octates of an IP

the numbers in the ip address are represented in sed as \1\2\3\4. If I put \1\2\3$i, then I change the last number. So for example to change the second number I'll do \1$i\3\4. Regards, Kfir Show Sample Output
This is sample output - yours may be different.
```
10.0.0.3
```
0

i=3; echo 10.0.0.1 | sed "s/$[0-9]\{1,3\}\.$$[0-9]\{1,3\}\.$$[0-9]\{1,3\}\.$$[0-9]\{1,3\}$/\1\2\3$i/g"

kipibenkipod · 2011-04-27 14:08:02 3
Matched string reference in replacement text

Use matched data and some other as replacement data Show Sample Output
This is sample output - yours may be different.
```
$ echo "abcde" | sed 's/./& /g'
a b c d e 
```
0

echo "abcde" | sed 's/./& /g'

totti · 2011-08-26 16:54:26 7
Remove comments from files

as suggest in frans coment : '/^#[^!].*/d' -> remove if line begin with # except shebang #!/bin/bash 's/$.*[^!]$#.*[^}]/\1/' -> remove inline comments except shebang and ${variable#}
This is sample output - yours may be different.
0

sed -i -e '/^#[^!].*/d' -e 's/$.*[^!]$#.*[^}]/\1/' <filename>

jlaunay · 2012-01-31 02:45:56 7
Continously show httpd's error log
This is sample output - yours may be different.
0

while [ 1 ]; do tail /var/log/httpd/error_log; sleep 2; clear; done

wildtype · 2012-03-09 17:10:40 3
set desktop background to highest-rated image from Reddit /r/wallpapers

Doesn't depend on curl and doesn't use thumbnails as wallpaper (which has the unfortunate effect of only allowing imgur links)
This is sample output - yours may be different.
0

wget -O - http://www.reddit.com/r/wallpapers.rss | grep -Eo 'http://i.imgur.com[^&]+jpg' | head -1 | xargs wget -O background.jpg

untitaker · 2012-04-25 11:15:26 4
Sort using kth column using : delimiter

Sort using kth column using : delimiter
This is sample output - yours may be different.
0

sort -t: -k 2 names.txt

ankush108 · 2012-06-26 19:15:30 3
Kill a lot of process once a time
This is sample output - yours may be different.
0

ps aux | grep <process> | grep -v grep | awk '{print $2}' | xargs -i -t kill -9 {}

szimbaro · 2013-02-27 12:33:30 4
Comment in line
This is sample output - yours may be different.
0

: "comment in line"

nhashimoto · 2013-04-21 08:01:50 6
Recursively remove all files in a CVS directory

This command removes and then cvs removes all files in the current directory recursively.
This is sample output - yours may be different.
0

find . -type f ! -path \*CVS\* -exec rm {} \; -exec cvs remove {} \;

jasonsydes · 2013-06-28 20:17:40 6

I use it to verify if readline support was specified at compile time. Show Sample Output

ruby -r rbconfig -e 'puts RbConfig::CONFIG["configure_args"]'

gdelfino · 2013-12-04 10:21:35 7

Change IP on an ESX interface
This is sample output - yours may be different.
0

esxcli network ip interface ipv4 set -i vmk1 -I 10.27.51.143 -N 255.255.255.0 -t static

PROJAK_SX · 2014-03-01 20:05:08 8
Use youtube-dl to download video with output Youtube Title

Before you use this command you want to replace everything after the "https:" with the url of the video which you want to download. This string and it's switches will use "youtube-dl" to download the Youtube url into the directory/folder where it is called from. It will output the video using the same name as Youtube uses.
This is sample output - yours may be different.
0

youtube-dl -c -o "%(title)s" -f 18 https://www.youtube.com/watch?v=5qSCKUCjdKg

tg0000 · 2014-06-12 23:31:55 11
Japanese shift-jis encoded subtitles in mplayer

Japanese subtitles are often encoded in shift-jis instead of utf-8, this avoids 文字化け when watching.
This is sample output - yours may be different.
0

mplayer video.mp4 -fontconfig -font 'Kochi Mincho' -sub 'video.srt' -subcp shift-jis

ephesus · 2015-01-16 00:08:43 8
Convert pdf to pure text.

Install pdfbox. http://pdfbox.apache.org Show Sample Output
This is sample output - yours may be different.
```
Convert pdf to text, perfectly.
```
0

java -jar pdfbox-app-2.0.6.jar ExtractText input.pdf

allenkons · 2017-05-22 20:38:48 17
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Selecting a random file/folder of a folder

Also looks in subfolders

Forget remembered path locations of previously ran commands

i.e.: Useful if you add ~/bin to your $PATH and you want to override locations of previously ran commands and you don't want to log out and log back in to be able to use them.

Calculate your total world compile time. (Gentoo Distros)

From Gentoo Forum, greetings to rudregues & steveL.

List all symbolic links in current directory

For those who don't have the symlinks command, you can use readlink. This command is not straightforward because readlink is very picky. The backslash in front of 'ls' means not to use an alias (e.g. color escape codes from an aliased 'ls' could mess up readlink), and the -1 (one) means to print the entries separated by newlines. xargs -l (the letter L) means to process each input separated by newlines as separate commands.

command shell generate random strong password

shell generate random strong password

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"

Find out current working directory of a process

This is an alternative to another command using two xargs. If it's a command you know there's only one of, you can just use: $ ls -l /proc/$(pgrep COMMAND)/cwd

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"

Fetch the current human population of Earth

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