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Full Discussion: SED inside while loop
Top Forums UNIX for Dummies Questions & Answers SED inside while loop Post 302369969 by paoie on Tuesday 10th of November 2009 05:01:58 AM
Old 11-10-2009
SED inside while loop
Hi,


im having problem creating a loop using my code: aside from the fact that the 1st variable (VAR) does not increment, it loops more than the expected output.

for sample purposes, test csv contains 3 lines.

Code:
 
#get number of lines in the file
 lines=$( wc -l < test.csv )
 
  VAR=1
  VAR2=1
 while [ $VAR -le $lines+1 ]
 do
 while [ $VAR2 -le $lines+1 ]
 do
      sed "s/,,/,one"$VAR"too"$VAR2",/" test.csv > test1.csv 
      VAR2=$(( $VAR2 + 1 ))
  done
 
  VAR=$(( $VAR + 1 ))
 
 done

Output of the code is like this, this is caused by the sed command, its like the script executes first the sed command then the loop:

Code:
 
a,b,c,d,e,one1too1,f
a,b,c,d,e,one1too1,f
a,b,c,d,e,one1too1,f
a,b,c,d,e,one1too2,f
a,b,c,d,e,one1too2,f
a,b,c,d,e,one1too2,f
a,b,c,d,e,one1too3,f
a,b,c,d,e,one1too3,f
a,b,c,d,e,one1too3,f
a,b,c,d,e,one1too4,f
a,b,c,d,e,one1too4,f
a,b,c,d,e,one1too4,f

But the output should be:

Code:
a,b,c,d,e,one1too1,f
a,b,c,d,e,one1too2,f
a,b,c,d,e,one1too3,f
a,b,c,d,e,one1too4,f

i hope i explained and posted this question appropriately...

Hope someone could help..really appreaciate it.. thanks!
 

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LEARN ABOUT REDHAT

upslog

UPSLOG(8)						      Network UPS Tools (NUT)							 UPSLOG(8)

NAME

       upslog - UPS status logger

SYNOPSIS

       upslog -h

       upslog ups logfile interval [format]

DESCRIPTION

       upslog  is  a  daemon  that  will poll a UPS at periodic intervals, fetch the variables that interest you, format them, and write them to a
       file.

       The default format string includes variables that are supported by many common UPS models.  See the description below to make your own.

OPTIONS

       -h     Display the help message.

       ups    Monitor this UPS.  The format for this option is [upsname@]hostname[:port].

       logfile
	      Store the results in this file.

	      You can use - for stdout, but upslog will remain in the foreground.

       interval
	      Wait this many seconds between polls.

	      Remember that a poll is not instantaneous, so it will slip back as the program runs.  If you  require  tighter  timing,  you  should
	      write your own logger using the upsclient library.

       format The string to log, including variables from the UPS.  Valid escapes within this string are:

	      %% - insert a single %

	      %TIME format% - insert the time with strftime formatting

	      %ETIME% - insert the number of seconds, ala time_t.  This is now a 10 digit number.

	      %HOST% - insert the local hostname

	      %UPSHOST% - insert the host of the UPS being monitored

	      %PID% - insert the pid of upslog

	      %VAR varname% - insert the value of variable varname

	      The default format string is:

	      %TIME @Y@m@d @H@M@S% %VAR battpct% %VAR utility% %VAR loadpct% [%VAR status%] %VAR upstemp% %VAR acfreq%

SERVICE DELAYS

       The  interval  value  is merely the number given to sleep() after running through the format string.  Therefore, a query will actually take
       slightly longer than the interval depending on the speed of your system.

LOG ROTATION

       upslog writes its pid to upslog.pid, and will reopen the log file if you send it a SIGHUP.  This allows it to keep running when the log	is
       rotated by an external program.

SEE ALSO

   Server:
       upsd(8)

   Clients:
       upsc(8), upscmd(8), upsrw(8), upsmon(8)

   Internet resources:
       The NUT (Network UPS Tools) home page: http://www.exploits.org/nut/

       NUT mailing list archives and information: http://lists.exploits.org/

								  Wed Oct 16 2002							 UPSLOG(8)
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