UNIX for Advanced & Expert Users

Multiple "echo" commands may be replaced by a "here-document".
This makes the script faster.

Example:

echo "Please enter your choice:"
echo "1 - list current directory"
echo "2 - list current users"
echo "3 - log off"


may be replaced with


cat <<!
Please enter your choice
1 - list current directory
2 - list current users
3 - log off
!
courtesy: SHELLdorado - Shell Tips & Tricks (Programmer)

How is this related to your requirement?

You need to display statements with timestamp after each and every process is completed

ksh supports coprocesses.

Code:

#!/bin/ksh
# mycoprocess.shl
while read value 
do
date
done

Code:

#!/bin/ksh
# your script
./mycoprocess.shl |&

get_date()
{
      print -p 'x'
      read -p dt
      echo $dt
}

call get_date anytime you need a timestamp. You did not post anything else, but if you did the same bactic trick you could modify your coprocess.shl to give multiple responses

BTW - this still leaves one level of child process creation; every date call executes an image. bash has a feature that allows you to create native (i.e., linked into bash) functions in bash written in C, if I recall correctly. That would further improve things.

If you are using ksh93, here is how to avoid forking a process to return the date.

Code:

$ printf "ABC.sh started at %(%H:%M:%S)T\n"
ABC.sh started at 07:43:06

Code:

printf "ABC.sh started at %(%H:%M:%S)T\n"

or

Code:

date "+ABC.sh started at %T"

You can also use the ksh/bash built-in variable SECONDS to keep track run time of each process.

Thanks binlib