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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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CG(1)																	     CG(1)

NAME
cg - Recursively grep for a pattern and store it. SYNOPSIS
cg [ -l ] | [ [ -i ] pattern [ files ] ] DESCRIPTION
cg does a search though text files (usually source code) recursively for a pattern, storing matches and displaying the output in a human- readable fashion. It is intended to give some of the functionaly of AT&T's cscope(1) tool, with the advantages of simplicity and not being language-specific. The script will colorize output if configured as such. It is typically run with a Perl regular expression to search for. The search can be made case insensitive by using the -i option. A list of files may also be specified with an additional argument after the pattern. Put the files pattern in quotes to make it be matched by Perl rather than by the shell. Running the script with no arguments will recall the results of the previous search. After the search, entries found can be edited using the vg(1) script. The -l option shows the last log made. SOME EXAMPLES
cg - alone recalls the previous search results. cg -i pattern - search the default list of files for all files matching the pattern (and case-insensitively). cg pattern '*.c' - search recursively for pattern in all *.c files. This automatically converts '*' to '.*' and '.' to '.' for you and does a Perl pattern match on all files in the tree. cg pattern *.c - search through the shell-expanded list of *.c files, so not done recursively (in other words, only the files your shell pass to the script as arguments). cg -l - show the last log made. COMMAND-LINE OPTIONS -i Do a case-insensitive search. -l Show the last log made. -p Toggle the default pager option. cg has a bulit-in pager function, which can be enabled or disabled by default (in .cgvgrc). If the default is enabled, this option disables the pager; if the default is disabled, this option enables it. -P Force the built-in pager to be disabled. FILES
${HOME}/.cglast Log file of the last search. ${HOME}/.cgvgrc Per-user configuration file (if the defaults are not desireable). ${HOME}/.cgvg/* Log files in $HOSTNAME.shell_pid form with the log of the last search. SEE ALSO
vg(1), perl(1), find(1), grep(1), cscope(1) AUTHOR
cg was written by Joshua Uziel <uzi@uzix.org>. 13 Mar 2002 CG(1)
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