alias - http://www.linfo.org/alias.html
alias ls="ls -al"
awk / gawk - http://www.tutorialspoint.com/awk/
bzip2
# compress file
bzip2 -k file.txt
bzip2 -c file.txt > compressed.bz2
# List compression information
bzip2 -v linux-3.18.19.tar
TBC...