Make sure that you have enough free space on the partition

To find out how much is free you can use from command prompt:
df -h

The output will look like this:
Filesystem                   Size  Used Avail Use% Mounted on
/dev/hda2                453G  364G   67G  85% /
tmpfs                           7.8G  292M  7.6G   4% /dev/shm

This means that you have some 67 GB of unused space, so you can proceed with next command that will create 10 GB file:
dd if=/dev/zero of=myharddisk.img bs=1000 count=0 seek=$[1000*1000*10]

Caveats:

This trick will work on ext3, ext4 & reiserfs – but will NOT work on FAT32 partitions as they have maximum file size of 4 GiB.

Also because this file is null from within – some programs will fail working with it – such as mkswapfs & mkswapon. For absolute majority of utilities it will work.

By: A. Eremenko

The following command will remove html tags from a file.

sed -i –e ‘s/<[^>]*>//g’ file.html

By: O Dietsche

When wanting to clean up some files for testing I needed to remove code from the front and end of the file in order to focus on the information in the body of the file.
The below commands are great when cleaning up files that have header and footer information that is similar in each file.

The following example shows how to delete the first 200 lines of a file:
find -type f -name ‘*.html’ -exec sed -i -e 1,200d {} \;

The following example shows how to delete the last 155 lines of a file:
find -type f -name ‘*.html’ -exec sed -i -e :a -e ‘$d;N;2,155ba’ -e ‘P;D’ {} \;

By: Tim Conrad

nohup is the perfect command line program to keep your applications running in the backgroup even when when you terminate your connection.
Example:
1. ssh into your server
2. type: nohup “the name of your long running application” &
3. exit

NOHUP(1) User Commands NOHUP(1)

NAME
nohup – run a command immune to hangups, with output to a non-tty

SYNOPSIS
nohup COMMAND [ARG]…
nohup OPTION

DESCRIPTION
Run COMMAND, ignoring hangup signals.

–help display this help and exit

–version
output version information and exit

If standard input is a terminal, redirect it from an unreadable file. If standard
output is a terminal, append output to ‘nohup.out’ if possible, ‘$HOME/nohup.out’
otherwise. If standard error is a terminal, redirect it to standard output. To
save output to FILE, use ‘nohup COMMAND > FILE’.

NOTE: your shell may have its own version of nohup, which usually supersedes the
version described here. Please refer to your shell’s documentation for details
about the options it supports.

AUTHOR
Written by Jim Meyering.

REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report nohup translation bugs to <http://translationproject.org/team/>

COPYRIGHT
Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3
or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WAR‐
RANTY, to the extent permitted by law.

SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/nohup>
or available locally via: info ‘(coreutils) nohup invocation’

GNU coreutils 8.25 February 2016 NOHUP(1)