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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 CENTOS

rsh

RSH(1)							    BSD General Commands Manual 						    RSH(1)

NAME

     rsh -- remote shell

SYNOPSIS

     rsh [-Kdnx] [-l username] host [command]

DESCRIPTION

     Rsh executes command on host.

     Rsh copies its standard input to the remote command, the standard output of the remote command to its standard output, and the standard error
     of the remote command to its standard error.  Interrupt, quit and terminate signals are propagated to the remote command; rsh normally termi-
     nates when the remote command does.  The options are as follows:

     -d    The -d option turns on socket debugging (using setsockopt(2)) on the TCP sockets used for communication with the remote host.

     -l    By default, the remote username is the same as the local username.  The -l option allows the remote name to be specified.

     -n    The -n option redirects input from the special device /dev/null (see the BUGS section of this manual page).

     If no command is specified, you will be logged in on the remote host using rlogin(1).

     Shell metacharacters which are not quoted are interpreted on local machine, while quoted metacharacters are interpreted on the remote
     machine.  For example, the command

	   rsh otherhost cat remotefile >> localfile

     appends the remote file remotefile to the local file localfile, while

	   rsh otherhost cat remotefile ">>" other_remotefile

     appends remotefile to other_remotefile.

FILES

     /etc/hosts

SEE ALSO

     rlogin(1),

HISTORY

     The rsh command appeared in 4.2BSD.

BUGS

     If you are using csh(1) and put a rsh in the background without redirecting its input away from the terminal, it will block even if no reads
     are posted by the remote command.	If no input is desired you should redirect the input of rsh to /dev/null using the -n option.

     You cannot run an interactive command (like rogue(6) or vi(1)) using rsh; use rlogin(1) instead.

     Stop signals stop the local rsh process only; this is arguably wrong, but currently hard to fix for reasons too complicated to explain here.

Linux NetKit (0.17)						  August 15, 1999					       Linux NetKit (0.17)
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