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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 302435098 by durden_tyler on Tuesday 6th of July 2010 10:51:11 AM
Old 07-06-2010
Change all single-quotes to double-quotes in your shell script, like so -

Code:
$
$
$ cat word_extractor_script.sh
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
$
$

It should work thereafter -

Code:
$
$ # show the contents of file "cleanme"
$ cat cleanme
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.
$
$ # show the contents of script "word_extractor_script.sh"
$ cat word_extractor_script.sh
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
$
$ # execute the script passing "cat" and "dog" as parameters
$ ./word_extractor_script.sh cat dog
$
$ # show the contents of "OutputShorter_cat_dog"
$ cat OutputShorter_cat_dog
 which is to one side of the elephant and underneath the
$
$

In any case, are you trying to do this ?

Code:
$
$ perl -plne 's/^.*cat(.*?)dog.*$/$1/' cleanme
 which is to one side of the elephant and underneath the
$

You don't need so many calls to sed in such a case.

tyler_durden
This User Gave Thanks to durden_tyler For This Post:
JamesForeman
 

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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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