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Full Discussion: While loop hangs in function running in background
Top Forums Shell Programming and Scripting While loop hangs in function running in background Post 302868599 by kanagalamurali on Monday 28th of October 2013 10:13:58 AM
Old 10-28-2013
Let me make this simple
I have a function with multiple while loops that fetch files from remote servers. I have paths in $paths variable and file names in $logs variable (Space separated).
Code:
Function () {
while read path from $paths
do
     while read log from  $logs
     do
           ssh -n $host du -skLc $logpath/$logfile   # get the size of remote file
           scp $host:$logpath/$logfile $localfile       # Download remote file

           while read line
           do
               grep $string $line > output file    # Grep for string in each line
           done < $localfile
    done
done

}

When i call this function as below it works fine
Code:
for host in $hosts
do
Function 
done

When i try to run it in background as below the inner most while loop which is reading log entries line by line does not exit after finishing the file.
Code:
for host $hosts
do
Function &
done

Please help me to fix this.
 

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LEARN ABOUT DEBIAN

bf_tar

BF_TAR(1)						    Bogofilter Reference Manual 						 BF_TAR(1)

NAME

       bf_tar - shell script to write a tar file of a bogofilter directory to stdout

SYNOPSIS

       bf_tar [-r] [-R] bogofilter_directory

DESCRIPTION

       bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see
       EXAMPLES below).

OPTIONS

       The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log
       files.

       The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive
       is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files.

EXIT STATUS

       The script exits with status code 0 if everything went well, and nonzero if it encountered trouble.

EXAMPLES

       o   bf_tar ~/.bogofilter > outfile.tar

	   Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar.

       o   bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz

	   Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz.

       o   bf_tar `pwd`/mydirectory > outfile.tar

	   Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path.

NOTES

       This script is meant for use with Berkeley DB based bogofilter versions.

       This script requires a SUSv2 compliant pax utility.

       This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so
       that /usr/xpg4/bin/sh can be used.

AUTHORS

       Matthias Andree

Bogofilter							    03/15/2010								 BF_TAR(1)
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