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The x and q options are not required but can speed things up.
ssh -qnx ...

try doing it like this:

for x in server1 server2 .. server10
do
ssh $x "<command>" </dev/null > file.log
done

i would test with a command that wont hard the system.

/home/insta cat...

When run in the background ssh requires the -n option.

ssh -n servername 'command goes here ' &

You could always use a "workaround" like this:
ls -lrt | tail -2 | head -1 | awk '{ print $9 }'to find out the second oldest filename in a directory and FTP that file, leaving the currently open...

You can check to see if any file has a particular file open using the lsof command.

lsof filename

produces no output if no process has that file open. If you're running on Solaris then you can...

I doubt whether UNIX has built in commands for these requriements. I see two queries here.

1) 'Already FTPed files' not be FTPed again :- Two solutions 1) Record the timings of when ever FTP...

Use Awk:

BEGIN { FS="\034"; RS="\035"; OFS="," }
{ gsub( /\n/, "" )
$1=$1
# If last field is empty, remove it.
if ( ""==$NF ) NF--
print
}