Issue with Single Quotes and Double Quotes for prompt PS1


 
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# 1  
Old 06-28-2013
Issue with Single Quotes and Double Quotes for prompt PS1

Hi,

Trying to change the prompt. I have the following code.
Code:
export PS1='
[$PWD]
<${USER}@`hostname -s`>$ '

The hostname is not displayed
Code:
[/users/home/abc]
<abc@`hostname -s`>$ uname -a
AIX xyz 1 6 00F736154C00

[/users/home/adcwl4h]
<adcwl4h@`hostname -s`>$

If I use double quotes, then the hostname is printed properly but the path on the screen display does not change even when I change the directory. I'm using korn shell in AIX.

So...
1) what is the diff b/w single and double quote
2) what is the correct code to display my path, user and hostname as I'm trying with the above code.

Appreciate your help.
# 2  
Old 06-28-2013
Single quotes turn of meta meanings entirely, so I prefer them, generally. When setting PS1:
  • anything for evaluation later must be in single quotes, like $PWD or an effective id or date call.
  • Things you can set at login time, like login id, tty or host name, can be barefoot or in double quotes.
This User Gave Thanks to DGPickett For This Post:
# 3  
Old 06-28-2013
That means
Code:
export PS1='
[$PWD]
<${USER}@'`hostname -s`'>$ '

This User Gave Thanks to MadeInGermany For This Post:
# 4  
Old 06-28-2013
If user and hostname are not dynamic, why not evaluate them once?
Code:
export PS1='
[$PWD]
<'"$USER@`hostname -s`>"'$ '

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