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HOWTO: Change the Unix prompt and windows title. PDF Print E-mail
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Written by Patrick Prevoo   
The default user prompt on Unix is "$" and the root prompt is "#". In this article you will find how you can change the prompt to display a lot of useful information. The same or other information can also be displayed in the windows title. The prompt is set by changing the PS1 environment setting.  
 
Some examples:
 
1. Username in prompt
PS1="$USER >"
Result: “user1 >”
 
2. Username and hostname in prompt
PS1="$USER@$(hostname) >"
Result: “ This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >”
 
If your hostname is the hostname including your domain name you can truncate the domain name.
 
3. Username with truncated hostname in prompt
PS1="$USER@$(hostname| awk -F . '{print $1}' ) >"
Result: “user1@host1 >”
 
3. Username, hostname and current path in prompt
PS1=$(echo "$USER@$(hostname| awk -F . '{print $1}') "'$PWD'" >")
Result: “user1@host1 /home/user1 >”
 
4. Username, hostname, current Oracle SID and current path in prompt  
PS1=$(echo "$USER@$(hostname| awk -F . '{print $1}') "'$ORACLE_SID'" "'$PWD'" >")
Result: “user1@host1 MainDB /home/user1 >”
 
By putting all this information in the prompt the prompt can get extremely long. In the next example all the information is on one line and the prompt on the next line.
 
5. Prompt on two lines
PS1=$(echo "\n[$USER@$(hostname| awk -F . '{print $1}') "'$ORACLE_SID'" "'$PWD'"] $(echo "\n")> ")
Result: [user1@host1 MainDB /home/user1 ]
            >  
 
All the information can also be set in the windows title. This only works on “terminals” that support this option. So in the profile you best test the “TERM” environment setting first. This option also works with putty ssh sessions.
 
Below a little script you can add to your personal profile or to your system profile.
 
The prompt will look like:  
[ user1@host1 MainDB /home/user1 ]
$
 
The windows title will look like:
host1 as user1 {MainDB} <The first user> /home/user1
 
When this user switches to root the prompt will look like:
[ root@host1 / ]
$
 
The windows title will look like:
host1 as root {} <The first user> /
 
The name between <> is the real user name so it will always be “The first user” and will not change to the display name of root. Running a lot (putty) sessions to different Unix systems from windows you will get one grouped putty item. When clicking on this taskbar group you can quickly find the session you are looking for. The hostname is at the front of the windows title to make it easier to find the right session.
 
When activating this script on every Unix system in your environment you can telnet, rsh, ssh and “su” as much as you want, the information on the prompt AND in the windows title will always be accurate.  
 
See Microsoft article kb#281628 (http://support.microsoft.com/kb/281628) to change the behavior of the grouping on windows. Changing the grouping setting to “2”, windows will always group all applications.
 
 
# Prompt settings
REALUSER=$(who am i |head -1 |awk '{print $1}')
REALNAME=$(cat /etc/passwd |grep "^$REALUSER:" |awk -F ':' '{print $5}')
HOSTNAME=`hostname | awk -F . '{ print $1 }'`
 
if [ "$USER" = "root" ]
then
  PS2='# '
else
  PS2='$ '
fi
 
PS1=""
if [ "$TERM" = "xterm" -o "$TERM" = "dtterm" -o "$TERM" = "aixterm" ]
then
  PS1=$(echo "\033]0;$HOSTNAME as $USER {"'$ORACLE_SID'"} <$REALNAME> "'$PWD'"\007")
fi
PS1=$PS1$(echo "\n[ $USER@$HOSTNAME "'$ORACLE_SID'" "'$PWD'" ]$(echo "\n$PS2")")
 
export PS1
 
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