05-13-2019
My first guess is that the while read opens the input and reads the first line, then ssh consumes all the residual lines from the input file. Try ssh -n.
But - the approach to loop through the input file and opening an ssh session for every single entry is resource hungry and far from optimal. How about creating a "search" file and running the grep from it in a single session?
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LEARN ABOUT DEBIAN
dnetcat
dnetcat(1) User Commands dnetcat(1)
NAME
dnetcat - opens a DECnet connection
SYNOPSIS
dnetcat {-h|--help}
dnetcat [-v] [-z] node[::|[::] ]object
dnetcat [-v] [-f] -l object
DESCRIPTION
dnetcat is a netcat(1) like tool that opens a DECnet connection and copies all data between the standard input/output to/from the socket.
OPTIONS
-v
Be verbose. Prints useful (debug) messages.
-z
Zero IO mode. In this mode a connection is dropped directly after it is opened. This can be used to scan if the remote side listens on the
given address and object.
-l
Listen mode. In this mode dnetcat accepts connections on the given object.
-f
Fork on new connection. This let netcat accept multiple connections in listen mode. This is ignored if -l is not given.
--help, -h
Prints a small help.
EXAMPLES
This program can be used as 'ProxyCommand' for ssh(1). You may use it via command line like this:
ssh -o 'ProxyCommand dnetcat %h ssh' [...] mynode
or you may use it in your ~/.ssh/config like this:
Host *::
ProxyCommand dnetcat %h ssh
This will enable you to connect to any DECnet node by adding "::" at the end of the node name like this:
ssh mynode::
For more information on ssh(1) see it's manpage.
SEE ALSO
ssh(1), netcat(1).
AUTHORS
This program is written by Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>.
dntools September 2008 dnetcat(1)