Useful aliases in Shell

Like 'ddd' , we can see the code while debugging with gdb too ... 
Set the '-tui' flag for gdb to enable this feature. and '-quiet' will suppress copyright messages. 
      
  alias gdb='gdb -tui -quiet'

Read as many as possible without scrolling

alias tail='tail -n $((${LINES}-2))'

Reading hex data
what most people want from od

alias od='od -Ad -tx1 -v'

Create a directory and go into it

md () { mkdir -p "$1" && cd "$1"; }

Write these functions in bashrc file,common in other languages, available in the shell

ord() { printf "0x%x\n" "'$1"; }

chr() { printf $(printf '\\%03o\\n' "$1"); }

Ex Usage:

dinesh@ubuntu:~$ chr 65
A
dinesh@ubuntu:~$ ord a
0x61
dinesh@ubuntu:~$ ord 1
0x31
dinesh@ubuntu:~$