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Full Discussion: error running shell script
Top Forums Shell Programming and Scripting error running shell script Post 302421202 by methyl on Thursday 13th of May 2010 07:19:33 PM
Old 05-13-2010
Code:
for i in `cat diffs.txt`
do
printer="$(awk -F: '{ print $1 }' | cut -c 11-18 diffs.txt)"
echo $printer
done

Back to the beginning of the script. Correction to my previous post after trying a different shell and using your sample data.
Code:
device for 0117bd1: lpd://172.25.29.60:515
device for 2201bl7: socket://172.25.11.170:9100
device for 5001bl1: lpd://172.25.11.203:515

The output is twelve identical lines:
Code:
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1
0117bd1 2201bl7 5001bl1

The reason there are 12 lines is because $i contains the entire contents of diffs.txt without the line terminators. There are twelve distinct space-separated elements. The variable $i is not referred to at all in the script so all that happens is the "printer=" line is executed 12 times. I cannot explain how the "printer=" line outputs anything but when inside a shell script it does.

Code:
Anyway the "for" loop is not required or desirable.
If we remove the loop completely and make sure that awk has a filename parameter, it now works:

printer="$(awk -F: '{ print $1 }' diffs.txt | cut -c 11-18)"
echo $printer

0117bd1 2201bl7 5001bl1

Okay, we now have the (unchanged) situation where $printer contains 3 printer names. This is not desirable when we look at the contents of f_Create.

Suggest you change the "printer=" line above to use a different variable name (e.g. "printer_list="), then look at where you want a list against where you want a single printer.

The f_Create function contains "read printer". This overwrites the variable $printer. The "read printer" line is not required - it is probably what is hanging the script because the input channel is already tied up with the "for" loop.
Further correction: The shell "read" statements conflict with the "for" loop. I think this script needs a redesign.


Footnote. To answer your earlier question it would be possible to automate the whole process but only if your diffs.txt file contains all the information in (which it does not) in a suitably delimeted format.
Last edited by methyl; 05-13-2010 at 08:26 PM.. Reason: Futher correction
 

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LEARN ABOUT REDHAT

directomatic

DIRECTOMATIC(1) 					      General Commands Manual						   DIRECTOMATIC(1)

NAME

       directomatic - Print without spooler

SYNOPSIS

       directomatic -P <printdef> [-J jobtitle] [-o option=value [...]] [file]

DESCRIPTION

       Directomatic is a filter script to print with free software printer drivers without the need of a print spooler.  It is designed to be used
       together with a Foomatic printer definition file.

   Options
       -P <printdef>
		 where printdef is the printer definition file to use.

       -J <jobtitle>
		 where job title will be printed in the head line of every page of a plain text job.

       -o option=value
		 Set an arbitrary option.

       file	 The file to print.

   Commands
       Directomatic will print from standard input unless a file to print is specified on the command line.  If your printer definition file is in
       /etc/foomatic/direct or ~/.foomatic/direct you do not need to specify its path.	Put a (instructions in the file) to redirect the output of
       directomatic to your printer instead of standard output. To make normal users able to print this way add them to group lp and make sure the
       appropriate printer device file /dev/lpX is group-writable.

       See http://www.linuxprinting.org/direct-doc.html

FILES

       /etc/foomatic/direct/<queue>
				The foomatic printer definition file.

EXIT STATUS

       directomatic returns 0 unless something unexpected happens.

AUTHOR

       Manfred Wassmann <manolo@NCC-1701.B.Shuttle.de> for the foomatic project using output from the associated binary.

BUGS

       None so far.

Foomatic Project						    2001-05-07							   DIRECTOMATIC(1)
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