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Full Discussion: Mixing Perl with Bash
Top Forums Shell Programming and Scripting Mixing Perl with Bash Post 302273290 by kermit on Saturday 3rd of January 2009 07:59:01 PM
Old 01-03-2009
Mixing Perl with Bash
I am fiddling with a little script that will issue a shutdown command if the temperature on the CPU goes above a certain level. I started writing the script in Bash, and then thought I would like to use Perl to extract the detailed bits, but I am not sure if this is really practical. Basically I want to parse the input a little better, but I am a bit of a novice at both Bash and Perl. I know how to extract what I want with Perl, but not so much with Bash. I know how to get the raw data with Bash, but I don't know how best to get that data to Perl, and then back as a variable to Bash so it can decide whether to leave the machine running, or issue a shutdown command. I wrote the first bit of the Bash script, which was relatively simple, but now I am at a standstill as I don't know how to bring Perl into the picture. Would my best bet be to write the 'raw data' to a file, and then call a separate Perl script, have it alter the file data as necessary, then read in the newly parsed data (in Bash) and act on that? Here is what I have gotten so far:

Code:
#!/bin/bash

cur_tmp= sensors | grep 'CPU Temp:' \
        | awk '{ print $3 }' \

 

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LEARN ABOUT LINUX

alien::package::rpm

Alien::Package::Rpm(3pm)				User Contributed Perl Documentation				  Alien::Package::Rpm(3pm)

NAME

       Alien::Package::Rpm - an object that represents a rpm package

DESCRIPTION

       This is an object class that represents a rpm package. It is derived from Alien::Package.

FIELDS

       prefixes
	   Relocatable rpm packages have a prefixes field.

METHODS

       checkfile
	   Detect rpm files by their extention.

       install
	   Install a rpm. If RPMINSTALLOPT is set in the environement, the options in it are passed to rpm on its command line.

       scan
	   Implement the scan method to read a rpm file.

       unpack
	   Implement the unpack method to unpack a rpm file. This is a little nasty because it has to handle relocatable rpms and has to do a bit
	   of permissions fixing as well.

       prep
	   Prepare for package building by generating the spec file.

       cleantree
	   Delete the spec file.

       build
	   Build a rpm. If RPMBUILDOPT is set in the environement, the options in it are passed to rpm on its command line.

	   An optional parameter, if passed, can be used to specify the program to use to build the rpm. It defaults to rpmbuild.

       version
	   Set/get version.

	   When retreiving the version, remove any dashes in it.

       postinst
       postrm
       preinst
       prerm
	   Set/get script fields.

	   When retrieving a value, we have to do some truely sick mangling. Since debian/slackware scripts can be anything -- perl programs or
	   binary files -- and rpm is limited to only shell scripts, we need to encode the files and add a scrap of shell script to make it
	   unextract and run on the fly.

	   When setting a value, we do some mangling too. Rpm maintainer scripts are typically shell scripts, but often lack the leading shebang
	   line.  This can confuse dpkg, so add the shebang if it looks like there is no shebang magic already in place.

	   Additionally, it's not uncommon for rpm maintainer scripts to contain bashisms, which can be triggered when they are ran on systems
	   where /bin/sh is not bash. To work around this, the shebang line of the scripts is changed to use bash.

	   Also, if the rpm is relocatable, the script could refer to RPM_INSTALL_PREFIX, which is set by rpm at run time. Deal with this by
	   adding code to the script to set RPM_INSTALL_PREFIX.

       arch
	   Set/get arch field. When the arch field is set, some sanitizing is done first to convert it to the debian format used internally. When
	   it's retreived it's converted back to rpm form from the internal form.

AUTHOR

       Joey Hess <joey@kitenet.net>

perl v5.12.3							    2011-06-11						  Alien::Package::Rpm(3pm)
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