# sed -n '$p' /etc/bashrc
echo UNIX.com

# `bash`

# exit
exit
-bash: UNIX.com: command not found

# echo "test"

# vim /usr/local/bin/test
Vim: Warning: Output is not to a terminal

# lsof | grep pts/5 >list

Every 1.0s: ps -eo "%p %P %y %x %c %a %t" | grep pts/5|grep -v grep               Mon May  9 22:05:50 2011
17607 12796 ?        00:00:00 sshd            sshd: root@pts/5               01:04:05
17609 17607 pts/5    00:00:00 bash            -bash                          01:04:05
26611 17609 pts/5    00:00:00 bash            bash                              26:52

# grep 26611 list
bash      26611      root    0u      CHR              136,5                   7 /dev/pts/5
bash      26611      root    2u      CHR              136,5                   7 /dev/pts/5
bash      26611      root  255u      CHR              136,5                   7 /dev/pts/5

#!/bin/bash
clear
echo ".-----------------------------------------------------------------."
echo "| |"
echo "| Please specify which Shell you want to switch to: |"
echo "| 1. Bash |"
echo "| 2. Korn Shell |"
echo "| 3. T Shell |"
echo "| |"
echo "'-----------------------------------------------------------------'"
echo " "
echo "Enter the number of your choice: "; read shell
case $shell in
1) echo "You are now in BASH" ; exec bash ;;
2) echo "You are now in KSH" ; exec ksh ;;
3) echo "You are now in TCSH" ; exec tcsh ;;
esac
clear