Use of uninitialized value $stdout in concatenation (.) or string at perlscript.pl line 28.

server-01: channel 2: new [client-session]
server-01: Requesting channel_open for channel 2.
server-01: Entering interactive session.
server-01: Requesting service exec on channel 2.
server-01: channel 2: open confirm rwindow 0 rmax 32768
server-01: input_channel_request: rtype exit-status reply 0
server-01: input_channel_request: rtype eow@openssh.com reply 0
server-01: channel 2: rcvd eof
server-01: channel 2: output open -> drain
server-01: channel 2: rcvd close
server-01: channel 2: input open -> closed
server-01: channel 2: close_read
server-01: channel 2: obuf empty
server-01: channel 2: output drain -> closed
server-01: channel 2: close_write
server-01: channel 2: send close
server-01: channel 2: full closed
[root@server-01 Name]#