Check your spelling

yum install aspell

or apt-get install aspell for Ubuntu systems

then in future  when ever  you need to know how to spell a word simply type

aspell -a <<< 'word'

save man pages as pdf

man -t ls | ps2pdf - ls.pdf


Will save the man pages for ls to ls.pdf


substitute ls for the programme man pages you want to save as a pdf

Script Terminal Session

script -f /tmp/filename

will place all output of the terminal, including carriage returns, to a file (/tmp/filename)

So then on another terminal session type

tail -f /tmp/filename

 This file can be tail -f by one or more terminals to display Live the information of the main terminal.

Great  way to share your screen on short notice.

to Stop scripting type
 <Cntrl> D

Ascii Digital Clock

install banner

yum install banner
then type


watch -n1 'banner `date +%T`'

How To Add a start up script to be Run at Boot time in Ubuntu

First Save your script in

  /etc/init.d/

then type:

sudo update-rc.d script_name defaults

This script will now run each time you boot up.

sort the contents of a text file in place

This will sort the contents of a file without the need to pipe it into a second file.

great for cron jobs



sort -g name_of_file_to_sort.txt -o $_

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Dropbox will allow you to share folders across multiple computers.

Removing old unused Kernels from your Fedora system

Old unused Kernels can take up a fair amount of Disk Space.
to install old ones.

Install yum utils
yum install yum-utils

package-cleanup --oldkernels --count=2

will remove all old kernels except for the last 2.

 Make Amount of Installed Kernels Permanent
Edit /etc/yum.conf and set installonly_limit

 
installonly_limit=2