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Full Discussion: Getting confused about passing parameters to perl
Top Forums Shell Programming and Scripting Getting confused about passing parameters to perl Post 302435083 by JamesForeman on Tuesday 6th of July 2010 10:25:55 AM
Old 07-06-2010
Getting confused about passing parameters to perl
I've got a large text file, cleanme, that I want to process for all combinations of words in a second file, commonwords.

So I can iterate through commonwords like so:
Code:
filearray=( `cat commonwords | tr '\n' ' '`)
filearray=( `cat commonwords | tr '\n' ' '`)

for firstword in ${filearray[@]}

	do
		for lastword in ${filearray[@]}
		do	
		./word_extractor_script.sh $firstword $lastword
		done

	done

However, when I call word_extractor_script.sh , I don't get quite the output I expect.

word_extractor_script.sh is as follows

Code:
perl -p -e 's/^.*?$1/$2/' cleanme > CleanerExtract

sed 's/^/$1 /g' CleanerExtract > CleanerExtract1

sed -n '/$2/p' CleanerExtract1 > CleanerExtract2

sed G CleanerExtract2 > CleanerExtract3

sed -e 's/.*$1//' -e 's/$2.*//' CleanerExtract3 > CleanerExtract4

sed '/^.\{1000\}/d' CleanerExtract4 > OutputShorter_$1_$2

rm CleanerExtract
rm CleanerExtract1
rm CleanerExtract2
rm CleanerExtract3
rm CleanerExtract4

If I replace $1 and $2 in word_extractor_script.sh with actual words, everything runs fine - am I doing something very dumb with the parameters I'm passing to the second script? Or is it something to do with the $ being a metacharacter in the regex and this causing thigns to get confused?

Thanks,

James


commonwords (for this example) could be

cat
dog
elephant

and cleanme could be

There is a cat next to a dog. The dog is next to the cat. The elephant is behind the dog but under the cat which is to one side of the elephant and underneath the dog.

I'd expect CleanerOutput_cat_dog to be produced as one of the results, and contain

which is to one side of the elephant and underneath the

... although instead I get nothing (unlike what happens if I run word_extractor_script.sh with the $1 and $2 replaced with cat and dog).
 

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LEARN ABOUT REDHAT

pidof

PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME

       pidof -- find the process ID of a running program.

SYNOPSIS

       pidof [-s] [-x] [-o omitpid] [-o omitpid..]  program [program..]

DESCRIPTION

       Pidof  finds  the  process  id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems
       used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts  are  located	in
       /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead.

OPTIONS

       -s     Single shot - this instructs the program to only return one pid.

       -x     Scripts too - this causes the program to also return process id's of shells running the named scripts.

       -o     Tells  pidof  to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro-
	      gram, in other words the calling shell or shell script.

NOTES

       pidof is simply a (symbolic) link to the killall5 program, which should also be located in /sbin.

       When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is  possible  that
       it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs.

SEE ALSO

       shutdown(8), init(8), halt(8), reboot(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    01 Sep 1998 							  PIDOF(8)
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