12-28-2019
As jgt already mentionned, we dont have much info on what /what extent you are moving what from mainframe to unix, COBOL is just the language used to program.... when I had to do the migration from OS/3 (Unisys) to unix, it was not the Cobol the pain ( I am not saying it was easy...) but I because of time limit had a port 1 to 1 ( make a unix box work and look like a mainframe...) I realized that I had no idea how transaction monitors worked, having just a little experience with Tuxedo...
my last port I did was stopped at 80% for political reasons, I opted for a version of open-cobol... Worked well many tools for conversion of data structure etc... but like the previous getting a transation monitor working means being able to emulate the screen the application uses/used on mainframe can be quite a challenging task... In other words you need a team to work on that in parallel...
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LEARN ABOUT LINUX
smtp-source
SMTP-SOURCE(1) General Commands Manual SMTP-SOURCE(1)
NAME
smtp-source - multi-threaded SMTP/LMTP test generator
SYNOPSIS
smtp-source [options] [inet:]host[:port]
smtp-source [options] unix:pathname
DESCRIPTION
smtp-source connects to the named host and TCP port (default: port 25) and sends one or more messages to it, either sequentially or in par-
allel. The program speaks either SMTP (default) or LMTP. Connections can be made to UNIX-domain and IPv4 or IPv6 servers. IPv4 and IPv6
are the default.
Note: this is an unsupported test program. No attempt is made to maintain compatibility between successive versions.
Arguments:
-4 Connect to the server with IPv4. This option has no effect when Postfix is built without IPv6 support.
-6 Connect to the server with IPv6. This option is not available when Postfix is built without IPv6 support.
-A Don't abort when the server sends something other than the expected positive reply code.
-c Display a running counter that is incremented each time an SMTP DATA command completes.
-C count
When a host sends RESET instead of SYN|ACK, try count times before giving up. The default count is 1. Specify a larger count in
order to work around a problem with TCP/IP stacks that send RESET when the listen queue is full.
-d Don't disconnect after sending a message; send the next message over the same connection.
-f from
Use the specified sender address (default: <foo@myhostname>).
-F file
Send the pre-formatted message header and body in the specified file, while prepending '.' before lines that begin with '.', and
while appending CRLF after each line.
-l length
Send length bytes as message payload. The length does not include message headers.
-L Speak LMTP rather than SMTP.
-m message_count
Send the specified number of messages (default: 1).
-M myhostname
Use the specified hostname or [address] in the HELO command and in the default sender and recipient addresses, instead of the
machine hostname.
-N Prepend a non-repeating sequence number to each recipient address. This avoids the artificial 100% hit rate in the resolve and re-
write client caches and exercises the trivial-rewrite daemon, better approximating Postfix performance under real-life work-loads.
-o Old mode: don't send HELO, and don't send message headers.
-r recipient_count
Send the specified number of recipients per transaction (default: 1). Recipient names are generated by prepending a number to the
recipient address.
-R interval
Wait for a random period of time 0 <= n <= interval between messages. Suspending one thread does not affect other delivery threads.
-s session_count
Run the specified number of SMTP sessions in parallel (default: 1).
-S subject
Send mail with the named subject line (default: none).
-t to Use the specified recipient address (default: <foo@myhostname>).
-T windowsize
Override the default TCP window size. To work around broken TCP window scaling implementations, specify a value > 0 and < 65536.
-v Make the program more verbose, for debugging purposes.
-w interval
Wait a fixed time between messages. Suspending one thread does not affect other delivery threads.
[inet:]host[:port]
Connect via TCP to host host, port port. The default port is smtp.
unix:pathname
Connect to the UNIX-domain socket at pathname.
BUGS
No SMTP command pipelining support.
SEE ALSO
smtp-sink(1), SMTP/LMTP message dump
LICENSE
The Secure Mailer license must be distributed with this software.
AUTHOR(S)
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
SMTP-SOURCE(1)