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How to display current time in the prompt

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Top Forums Shell Programming and Scripting How to display current time in the prompt
# 8  
Old 10-03-2012
Hello rdrtx1,

Thanks for your reply. I am not much familiar with unix options, so I tried to google trap command and found that it catches a signal sent to the process.

I tried executing it on prompt, nothing happens (no prompt change).

Can you please guide me if there is another way of running this command.
# 9  
Old 10-03-2012
The trap is from a process signal. Hitting the return key with an empty line does not generate a process therefore no signal is generated. So every command executed at the prompt should return a signal and the trap command will execute.
# 10  
Old 10-03-2012
Thank you for explaining the trap.

But I am not achieving my goal to get current time in prompt using:

Code:
trap 'PS1="$(date ) > "' 47

Please suggest.
# 11  
Old 10-03-2012
try:
Code:
trap 'PS1="$(date ) > "' SIGCHLD

# 12  
Old 10-03-2012
Quote:
Originally Posted by rdrtx1
try:
Code:
trap 'PS1="$(date ) > "' SIGCHLD

Executed this as well but no luck.
Code:
$ trap 'PS1="$(date ) > "' SIGCHLD
$

# 13  
Old 10-03-2012
Defined signals on bash (gnu/linux) are:
Code:
EXIT
SIGHUP
SIGINT
SIGQUIT
SIGILL
SIGTRAP
SIGABRT
SIGBUS
SIGFPE
SIGKILL
SIGUSR1
SIGSEGV
SIGUSR2
SIGPIPE
SIGALRM
SIGTERM
SIGSTKFLT
SIGCHLD
SIGCONT
SIGSTOP
SIGURG
SIGXCPU
SIGXFSZ
SIGVTALRM
SIGPROF
SIGWINCH
SIGIO
SIGPWR
SIGSYS
32
33
SIGRTMIN
SIGRTMIN+1
SIGRTMIN+2
SIGRTMIN+3
SIGRTMIN+4
SIGRTMIN+5
SIGRTMIN+6
SIGRTMIN+7
SIGRTMIN+8
SIGRTMIN+9
SIGRTMIN+10
SIGRTMIN+11
SIGRTMIN+12
SIGRTMIN+13
SIGRTMIN+14
SIGRTMIN+15
SIGRTMAX-14
SIGRTMAX-13
SIGRTMAX-12
SIGRTMAX-11
SIGRTMAX-10
SIGRTMAX-9
SIGRTMAX-8
SIGRTMAX-7
SIGRTMAX-6
SIGRTMAX-5
SIGRTMAX-4
SIGRTMAX-3
SIGRTMAX-2
SIGRTMAX-1
SIGRTMAX

HP-UX ksh does not have all of there defined but one of the should work on your system.
# 14  
Old 10-03-2012
I executed all the above provided options but none gave me desired output:

Code:
$ trap 'PS1="$(date ) > "' EXIT
$ trap 'PS1="$(date ) > "' SIGHUP
$ trap 'PS1="$(date ) > "' SIGINT
$ trap 'PS1="$(date ) > "' SIGQUIT
$ trap 'PS1="$(date ) > "' SIGILL
$ trap 'PS1="$(date ) > "' SIGTRAP
$ trap 'PS1="$(date ) > "' SIGABRT
$ trap 'PS1="$(date ) > "' SIGBUS
$ trap 'PS1="$(date ) > "' SIGFPE
$ trap 'PS1="$(date ) > "' SIGKILL
$ trap 'PS1="$(date ) > "' SIGUSR1
$ trap 'PS1="$(date ) > "' SIGSEGV
$ trap 'PS1="$(date ) > "' SIGUSR2
$ trap 'PS1="$(date ) > "' SIGPIPE
$ trap 'PS1="$(date ) > "' SIGALRM
$ trap 'PS1="$(date ) > "' SIGTERM
$ trap 'PS1="$(date ) > "' SIGSTKFLT
$ trap 'PS1="$(date ) > "' SIGCHLD
$ trap 'PS1="$(date ) > "' SIGCONT
$ trap 'PS1="$(date ) > "' SIGSTOP
$ trap 'PS1="$(date ) > "' SIGURG
$ trap 'PS1="$(date ) > "' SIGXCPU
$ trap 'PS1="$(date ) > "' SIGXFSZ
$ trap 'PS1="$(date ) > "' SIGVTALRM
$ trap 'PS1="$(date ) > "' SIGPROF
$ trap 'PS1="$(date ) > "' SIGWINCH
$ trap 'PS1="$(date ) > "' SIGIO
$ trap 'PS1="$(date ) > "' SIGPWR
$ trap 'PS1="$(date ) > "' SIGSYS
$ trap 'PS1="$(date ) > "' 32
$ trap 'PS1="$(date ) > "' 33
$ trap 'PS1="$(date ) > "' SIGRTMIN
$ trap 'PS1="$(date ) > "' SIGRTMIN+1
$ trap 'PS1="$(date ) > "' SIGRTMIN+2
$ trap 'PS1="$(date ) > "' SIGRTMIN+3
$ trap 'PS1="$(date ) > "' SIGRTMIN+4
$ trap 'PS1="$(date ) > "' SIGRTMIN+5
$ trap 'PS1="$(date ) > "' SIGRTMIN+6
$ trap 'PS1="$(date ) > "' SIGRTMIN+7
$ trap 'PS1="$(date ) > "' SIGRTMIN+8
$ trap 'PS1="$(date ) > "' SIGRTMIN+9
$ trap 'PS1="$(date ) > "' SIGRTMIN+10
$ trap 'PS1="$(date ) > "' SIGRTMIN+11
$ trap 'PS1="$(date ) > "' SIGRTMIN+12
$ trap 'PS1="$(date ) > "' SIGRTMIN+13
$ trap 'PS1="$(date ) > "' SIGRTMIN+14
$ trap 'PS1="$(date ) > "' SIGRTMIN+15
$ trap 'PS1="$(date ) > "' SIGRTMAX-14
$ trap 'PS1="$(date ) > "' SIGRTMAX-13
$ trap 'PS1="$(date ) > "' SIGRTMAX-12
$ trap 'PS1="$(date ) > "' SIGRTMAX-11
$ trap 'PS1="$(date ) > "' SIGRTMAX-10
$ trap 'PS1="$(date ) > "' SIGRTMAX-9
$ trap 'PS1="$(date ) > "' SIGRTMAX-8
$ trap 'PS1="$(date ) > "' SIGRTMAX-7
$ trap 'PS1="$(date ) > "' SIGRTMAX-6
$ trap 'PS1="$(date ) > "' SIGRTMAX-5
$ trap 'PS1="$(date ) > "' SIGRTMAX-4
$ trap 'PS1="$(date ) > "' SIGRTMAX-3
$ trap 'PS1="$(date ) > "' SIGRTMAX-2
$ trap 'PS1="$(date ) > "' SIGRTMAX-1
$ trap 'PS1="$(date ) > "' SIGRTMAX
$
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