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Full Discussion: problem developing for or while loops with the cut command
Top Forums Shell Programming and Scripting problem developing for or while loops with the cut command Post 302258420 by Lakris on Friday 14th of November 2008 01:50:28 PM
Old 11-14-2008
Hi again,
Well, I'm sorry to say it, but that doesn't give the expected output, at least not on my machine. The columns don't line up. And he also wanted headers, which was the reason for either two printf statements in an awk program or other AWKward cats and whiles and echoes... a seemingly complicaticated way to do it.
If it wasn't for the headers, Danmeros original solution would still have been the most correct:

Code:
awk '{printf "%-22s %-26s %s\n",$1,$2,3}' infile

or even

Code:
while read x y z;do printf "%-22s %-26s %s\n" $x $y $z;done < infile

I did an experiment: the latter is faster on my machine on small files (the actual content supplied by OP) but when the file is 100 times bigger the awk program is a lot faster, a 10th of the time. So the conclusion is that if You need a reason to go for a cup of cocoa, run the while loop. If You are anxious to get home at the end of the day, do the awk. It's several nanoseconds we're dealing with here dudes!

The point, in this case, is taking in the arguments with any program that ignores repeated whitespace and reformat it in the desired fashion. At least that's how I see it. And which I missed completely in my first attempts at cracking it, focusing on how to handle or convert whitespace.


/Lakris
 

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LEARN ABOUT OSX

sleep

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

NAME

     sleep -- suspend execution for an interval of time

SYNOPSIS

     sleep seconds

DESCRIPTION

     The sleep command suspends execution for a minimum of seconds.

     If the sleep command receives a signal, it takes the standard action.

IMPLEMENTATION NOTES

     The SIGALRM signal is not handled specially by this implementation.

     The sleep command will accept and honor a non-integer number of specified seconds (with a '.' character as a decimal point).  This is a non-
     portable extension, and its use will nearly guarantee that a shell script will not execute properly on another system.

EXIT STATUS

     The sleep utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     To schedule the execution of a command for x number seconds later (with csh(1)):

	   (sleep 1800; sh command_file >& errors)&

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

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

	   while (1)
		   if (! -r zzz.rawdata) then
			   sleep 300
		   else
			   foreach i (`ls *.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

     nanosleep(2), sleep(3)

STANDARDS

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

HISTORY

     A sleep command appeared in Version 4 AT&T UNIX.

BSD
								  April 18, 1994							       BSD
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