parsing output from expect script

[MattB]

Hello,

My goal is to use expect to

1-connect to a series of systems
2-execute a command 20 times on each node to read through a log
(command is 'readlog')
3-grab the output of the commands
4-apply an regular expression on the returned buffer to only search
for lines with "Chassis"
5-prepend a hostname to each of the parsed lines returned from #4 like
nod200-bmc : <text after ran thru regex which contains "Chassis">

Here is what I have so far . This script does login ok and runs my
command to get logs but I see everything including the telnet
password send etc. In addition I also see a bunch of log info I do
not need.

===============

#!/usr/bin/expect -f
set expect_out(buffer) {}
set userid FOO
set passwd BAR
set timeout 10
match_max 100000
set nodecount 1
while {$nodecount < 3500} {
set node_init($nodecount) 1
log_user 0
spawn telnet nod$nodecount-bmc
expect "login : "
send -- "$userid\r"
expect -exact "USERID\r
Password: "
send -- "$passwd\r"
set count 20
while {$count > 0} {
send -- "readlog\r"
set count [expr $count -1]
#regular expression go here maybe?
}

send -- "exit\r"
expect "exit\r"
incr nodecount
}
send -- "exit\r"
expect eof

===============
Thank you for any insight.

re,

MattB

[F. Michael Orr]

You have to clear the expect buffer after your commands if you don't want
their output. e.g.

send -- "$passwd\r"
expect -re "$passwd.*"prompt regex here" $"
set count 20 ....
send "readlog\r";
expect "readlog\r\n";
expect -re "output regex here"

You have to be careful with the regexs. Remember they are greedy by
default, which can sometimes match more than you want. Use the
'exp_internal 1' command at your regex; I find it useful to debug regex's.