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Full Discussion: using awk inside bash script?
Top Forums UNIX for Dummies Questions & Answers using awk inside bash script? Post 302503906 by xaiu on Saturday 12th of March 2011 08:21:42 PM
Old 03-12-2011
using awk inside bash script?
Hello,

I'm trying to write a bash script that will query the current system time (OS X 10.6.6) and then convert the output from HH:MM:SS into time in seconds. The output of the system time command (systemsetup -gettime) is returned as:

Time: HH:MM:SS

so I wanted to use awk -F: to grab HH:MM:SS

From the command line I can:

Code:
prompt: systemsetup -gettime ; a=$(systemsetup -gettime) ; echo $a | awk -F: '{print $2":"$3":"$4}'
  Time: 22:32:59 <-- output of systemsetup -gettime
   22:32:59 <-- tells me that I want to capture $2, $3, and $4

How do I assign $2, $3, and $4 from awk to the variables hr, min, and sec?

Thank you all in advance!

---------- Post updated at 06:21 PM ---------- Previous update was at 10:26 AM ----------

Sorry, I didn't know how to use the code tags.

I found a different method to capture the hours, minutes, and seconds, so in the above example I now have:

Code:
d=$ref_time
IFS=":"
set -- $d
hr=$2
min=$3
sec=$4

# strip leading white space from hr
hr=$(echo $hr | tr -d " ")

so if ref_time was set to "Time: 22:32:59" then
Code:
prompt: echo $ref_time
Time: 22:32:59
prompt: echo $hr $min $sec
22 32 59

I would now like to re-assemble hr, min, and sec into a single variable. I tried variations of:
Code:
set_time=$hr":"$min":"$sec

but with everything I've tried echo $set_time still returns 22 32 59 and I need it to return 22:32:59 with the :'s.

Any advice?
Last edited by xaiu; 03-12-2011 at 09:37 PM..
 

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LEARN ABOUT NETBSD

sleep

SLEEP(1)						    BSD General Commands Manual 						  SLEEP(1)

NAME

     sleep -- suspend execution for an interval of time

SYNOPSIS

     sleep seconds

DESCRIPTION

     The sleep utility suspends execution for a minimum of seconds.  It is usually used to schedule the execution of other commands (see EXAMPLES
     below).

     Note: The NetBSD sleep command will accept and honor a non-integer number of specified seconds.  This is a non-portable extension, and its
     use will nearly guarantee that a shell script will not execute properly on another system.

     When the SIGINFO signal is received, the estimate of the amount of seconds left to sleep is printed on the standard output.

EXIT STATUS

     The sleep utility exits with one of the following values:

     0	   On successful completion, or if the signal SIGALRM was received.

     >0    An error occurred.

EXAMPLES

     To schedule the execution of a command for 1800 seconds later:

	   (sleep 1800; sh command_file >& errors)&

     This incantation would wait half an hour before running the script command_file.  (See the at(1) utility.)

     To reiteratively run a command (with csh(1)):

	   while (1)
		   if (! -r zzz.rawdata) then
			   sleep 300
		   else
			   foreach i (*.rawdata)
				   sleep 70
				   awk -f collapse_data $i >> results
			   end
			   break
		   endif
	   end

     The scenario for a script such as this might be: a program currently running is taking longer than expected to process a series of files, and
     it would be nice to have another program start processing the files created by the first program as soon as it is finished (when zzz.rawdata
     is created).  The script checks every five minutes for the file zzz.rawdata, when the file is found, then another portion processing is done
     courteously by sleeping for 70 seconds in between each awk job.

SEE ALSO

     at(1), nanosleep(2), sleep(3)

STANDARDS

     The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								  August 13, 2011							       BSD
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