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How to display current time in the prompt

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# 29  
Old 10-03-2012
Quote:
Originally Posted by rdrtx1
manishdivs, since your shell supports Chubler_XL's solution, use it. Forget about trapping SIGs. I'm stuck until the system is changed.
Ok.. Thanks a lot for your help and time for solving my query.
# 30  
Old 10-03-2012
On my linux box, ksh:
Code:
PS1='$(date)'" > "

works fine:
Code:
Wed Oct  3 18:50:28 CDT 2012 >
Wed Oct  3 18:50:29 CDT 2012 >
Wed Oct  3 18:50:29 CDT 2012 >
Wed Oct  3 18:50:29 CDT 2012 >
Wed Oct  3 18:50:30 CDT 2012 >
Wed Oct  3 18:50:30 CDT 2012 >
Wed Oct  3 18:50:31 CDT 2012 >
Wed Oct  3 18:50:31 CDT 2012 >
Wed Oct  3 18:50:31 CDT 2012 >

Code:
echo ${.sh.version}

Version JM 93t+ 2010-06-21
Last edited by rdrtx1; 10-03-2012 at 09:01 PM.. Reason: Include ksh version
# 31  
Old 10-03-2012
Quote:
Originally Posted by manishdivs
Worked fine in ksh.

Thanks a lot for the solution. By any chance is there any other way (simpler) also do achieve this?
This is a fairly good solution as it dosn't run the date executable everytime you hit enter, all the calculations are done in pure ksh.

The trap solution (if you get it working) will continue to display the same time until you another external command, also if you change PS1 it will change it back on you:

Code:
$ trap 'PS1="$(date +%H:%M:%S) $"' SIGCHLD
$ echo
$ /bin/echo "now"
now
09:54:21 $PS1='# '
# 
# echo
# /bin/echo "oops"
oops
09:54:35 $

@rdrtxt Linux typically uses pdksh which supports the construct you posted.
# 32  
Old 10-04-2012
Quote:
Originally Posted by Chubler_XL
Try this: in file setprompt put:

Code:
unset _h _m _s
eval $(date "+_h=%H ;_m=%M ;_s=%S")
((SECONDS = 3600*${_h#0}+60*${_m#0}+${_s#0}))
typeset -Z2 _h _m _s
_tsub="(_m=(SECONDS/60%60)) == (_h=(SECONDS/3600%24)) + (_s=(SECONDS%60))"
_timehm='${_x[_tsub]}$_h:${_m}'
_timehms='${_x[_tsub]}$_h:$_m:${_s}'
 
PS1="$_timehms $ "


Then from your command line, source the setprompt file eg:

Code:
 $ . ./setprompt
09:25:27 $ 
09:25:38 $


Hello Chubler_XL,

This code worked perfectly for me but I have a silly question here.

If I run this code as
Code:
. ./setprompt

then it works fine but if I run the script like
Code:
./setprompt

then it do nothing.

What is the difference between these two ways to execute the script?
# 33  
Old 10-04-2012
This is called sourcing and the shell reads the commands from the source file and executes them in the current shell.

When you use ./setprompt the current interactive shell spawns a new child shell and the script is run by that. PS1 is changed in the child shell correctly, but then this child shell terminates returning control back to your current interactive shell with your old PS1 value.
This User Gave Thanks to Chubler_XL For This Post:
manishdivs
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