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Timeouts in expect script

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# 1  
Old 02-01-2012
Timeouts in expect script
Hi all.
I have an expect script which for walks across servers, checks freespace and provides sorted list of biggest files

Code:
#!/usr/bin/expect --
set timeout 600
stty -echo
log_user 0
spawn -noecho sudo -u introot /home/introot/bin/twssh [lindex $argv 0]
expect root
send_user "Entering [lindex $argv 0]\r"
send "uname\r"
log_user 1
expect "Linux" {send "for i in `df -lPh |sed s/\%// |sed '1d' |awk '{if (\$(NF-1) >= 88) print \$NF}'`; do echo \" \$i has `df -hlP \$i | tail -1 | awk '{print \$2, of space,\$(NF-1)}'` is full\" && find \$i -xdev -type f -size +10000k -exec stat -c\"%U %n %s\" {} \\; | sort -nrk 3 | head -40; done\r"
} "SunOS" {send "for i in `df -kl |sed s/\%// |sed '1d' |awk '{if (\$(NF-1) >= 88) print \$NF}'`; do echo \" \$i has `df -kl \$i | tail -1 | awk '{print \$2, of space,\$(NF-1)}'` is full\" && find \$i -xdev -type f -size +10000k -exec ls -l {} \\; | sort -nrk 5 | head -40; done\r"
}
expect eof

The problem is with timeout:
- if it too short then sometimes expect does wait till find and sort commands finish
- if it too long then i have to wait for a while on each host.

Pls advise

---------- Post updated at 12:13 AM ---------- Previous update was at 12:00 AM ----------

There is a typo, i mean "if timeout is too short then sometimes expect does NOT wait till find and sort commands finish"
# 2  
Old 02-01-2012
use 'set timeout -1'. This will make script not to time out and script will come out as soon as it done.
# 3  
Old 02-05-2012
If timeout is set to -1, expect NEVER waits output of find and exits immidiately
# 4  
Old 02-05-2012
Quote:
- if it too long then i have to wait for a while on each host.
I think the issue here is that the wait eof is never getting an eof.

You should insert send "exit\r" before your last expect eof:
Code:
...
}
send "exit\r"
expect eof

Then set the timeout long enough for the longest time you ever expect a command to take (plus a 20% saftey factor, eg set timeout 2000). Also consider using a different timeout for command prompt to eof as prompt should come back much sooner than eof after exit is issued.
# 5  
Old 02-05-2012
It works great on Solaris, but on Linux boxes the output of find is flushed immidiately after script finished. I dont see this output even in my screen's buffer (it is large enough to store this output). Adding "sleep 5" before send "exit\r" didn't help. I see only one possible solution - redirect output into file and parse it after, but i am expecting to use this script interactively (i need to paste output in mails) and i guess there may be a much easier way to resolve this, doesn't it?
# 6  
Old 02-05-2012
This thread:

https://www.unix.com/shell-programmin...solutions.html

Might give you some pointers to writing results to file and expect buffer sizes.
# 7  
Old 02-05-2012
I amended my script as you proposed in above thread, now it looks so:
Code:
#!/usr/bin/expect --
set timeout 600
match_max 10000
stty -echo
log_user 0
spawn -noecho sudo -u introot /home/introot/bin/twssh [lindex $argv 0]
expect root
send_user "Entering [lindex $argv 0]\r"
send "uname\r"
log_user 1
expect "Linux" {send "for i in `df -lPh |sed s/\%// |sed '1d' |awk '{if (\$(NF-1) >= 88) print \$NF}'`; do echo \" \$i has `df -hlP \$i | tail -1 | awk '{print \$2, of space,\$(NF-1)}'` is full\" && find \$i -xdev -type f -size +10000k -exec stat -c\"%U %n %s\" {} \\; | sort -nrk 3 | head -40; done\r"
} "SunOS" {send "for i in `df -kl |sed s/\%// |sed '1d' |awk '{if (\$(NF-1) >= 88) print \$NF}'`; do echo \" \$i has `df -kl \$i | tail -1 | awk '{print \$2, of space,\$(NF-1)}'` is full\" && find \$i -xdev -type f -size +10000k -exec ls -l {} \\; | sort -nrk 5 | head -40; done\r"
}
send "exit\r"
set NewLineChar "\r"
expect {
    $NewLineChar { append dbscntl $expect_out(buffer); exp_continue}
    eof { append dbscntl $expect_out(buffer) }
}
puts $dbscntl

Like before, I see output just for second on Linux, then screen flushed and i see only "Connection to hostname.localnet closed."
In comparsion with earlier ouputs one empty line was added. So $dbscntl remains empty because "expect eof" never works for me
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