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Full Discussion: ksh PS4 variable assign to `date` output
Top Forums Shell Programming and Scripting ksh PS4 variable assign to `date` output Post 302868939 by aoussenko on Tuesday 29th of October 2013 10:09:44 AM
Old 10-29-2013
ksh PS4 variable assign to `date` output
Hi guys,
Is there a way to assign curent time to PS4 variable in ksh. My goal is to have each line produced by 'set -x' command to have a time stamp.
Here is my code:

Code:
$cat test
#!/usr/bin/ksh
export PS4="`date` [${LINENO}]"
set -x
echo "TRACE LINE ONE"
echo "I WILL SLEEP FOR 10 SEC"
sleep 10
echo "TRACE LINE TWO"
exit 0
$

and this is an output:

Code:
$./test
Tue Oct 29 10:05:53 EDT 2013 [2]echo TRACE LINE ONE
TRACE LINE ONE
Tue Oct 29 10:05:53 EDT 2013 [2]echo I WILL SLEEP FOR 10 SEC
I WILL SLEEP FOR 10 SEC
Tue Oct 29 10:05:53 EDT 2013 [2]sleep 10
Tue Oct 29 10:05:53 EDT 2013 [2]echo TRACE LINE TWO
TRACE LINE TWO
Tue Oct 29 10:05:53 EDT 2013 [2]exit 0
$

Note: the time stamp remains the same although 'sleep 10' should have change it.
May be someone know how to make the time to change dynamically
I am in ksh88.
Thanks a lot for any advice.....
 

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LEARN ABOUT PHP

shift

shift(1)                                                           User Commands                                                          shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           shift(1)
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