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Full Discussion: Script in bash that works only some of the time
Top Forums Shell Programming and Scripting Script in bash that works only some of the time Post 302960918 by twinion on Sunday 22nd of November 2015 02:10:56 AM
Old 11-22-2015
Quote:
Originally Posted by balajesuri
I don't see why you're performing cat on a directory. Is this a typo? If not, you will not get your intended results. Also, you can grep directly on the file instead of piping the cat output to grep. Read this "useless use of cat".
sorry that is a typo when written into the forum

mytest15=`cat /pathtofile/filename | grep -c filename.$DATE.TXT | grep TRL | wc -l`

basically i know the file has completed writing when it has the word TRL in the file.

---------- Post updated at 02:10 AM ---------- Previous update was at 02:04 AM ----------

Quote:
Originally Posted by Peasant
Other then mentioned, use #!/bin/bash -x and examine the nohup.out during the hang.

If you are on linux system, inotify should provide much better interface for actions on file changes.

Please, if you can, post the entire code and/or explain what are you trying to do so perhaps a better approach could be written.

Hope that helps
Regards
Peasant.
-x i will give that a try.

im positive it could be written a hell of alot better as im still very new.

what the script does is waits for a file to be written to a directory.
when that file arrives, it then waits for it to finish being built by looking for TRL inside the file.
Then it renames the file and moves it.

as i said ran ti yesterday worked fine.
ran it today in the background it didnt see that the file arrived.
so i killed it then ran it
ran it normally...it spotted the file and worked as expected.
i just dont understand why it was in the background it didnt notice that the file was there, and yesterday it worked fine
 

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LEARN ABOUT DEBIAN

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 v5.14.2							    2011-08-05						  Alien::Package::Rpm(3pm)
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