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LIST OF USEFUL LINUX COMMANDS
Author: Mauricio Esguerra
Date:   November 18, 2009
email:  mauricio.esguerra@gmail.com
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paste: 
- Concatenates two files side by side instead of one at the end
  of the other as cat does.

tree:
- Gives you a tree representation of directories could be
  thought of as similar to ls

free -m
- Shows how much RAM your computer has.

uname -a
- Tells you what distro and kernel version u have.

wget -r -l1 --no-parent -nd http://www.eden.rutgers.edu/~esguerra/scripts
- Will get all files in the scripts folder.

rsync -av --progress --delete --log-file=/home/esguerra/rsync_$(date +%Y%m%d).log \
/workstation /media/myexternalharddrive
- This will make a backup of the data in my workstation to my external hard drive.
  Note that it will create a log file whose 4th column format should be read as
  cd+++++++++  del
  cL+++++++++  link
  cS+++++++++  send
  >f+++++++++  recv

find /home/esguerra/esguerra.myosin/Articles/ -type f -print0 | xargs -0 chmod 644
- This are three commands (find, xargs and chmod) combined to change permissions 
  recursively to files only.

find /home/esguerra/esguerra.myosin/Articles/ -type d -print0 | xargs -0 chmod 755
- This are three commands (find, xargs and chmod) combined to change permissions 
  recursively to folders only.



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LINKS:
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http://www.linuxguide.it/linux_commands_line_en.htm
http://www.pixelbeat.org/cmdline.html
http://www.linuxquestions.org/questions/linux-general-1/chmod-all-files-644-and-files-755-542059/