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Old 07-08-2019, 05:03 AM   #1
Registered: Jul 2006
Location: Belgrade, Yugoslavia
Distribution: Debian stable/testing, amd64
Posts: 976

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cron + expect

"#!/usr/bin/expect -f..." script doesnt work in cron.
I use it for telnet.
I have googled it and others have the same problem, but couldnt find solution.



nope it dont work, breaks at:
spawn /usr/bin/telnet <ipadress>

Last edited by qrange; 07-08-2019 at 06:31 AM.
Old 07-08-2019, 06:43 AM   #2
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Originally Posted by qrange View Post
spawn /usr/bin/telnet <ipadress>
My guess is that this doesn't work because telnet expects (no pun intended) a tty, and cron doesn't provide one.

It would help if you shared the entire expect script and also told us what the script is supposed to achieve.
Old 07-09-2019, 06:54 AM   #3
Registered: Jul 2006
Location: Belgrade, Yugoslavia
Distribution: Debian stable/testing, amd64
Posts: 976

Original Poster
Rep: Reputation: 47
I've found solution here:

that guy had the exact same problem (eof) and solved it by removing 'expect_after timeout'.
it works now but is there a way to keep the timeout?

solved completely by putting command 'expect_after timeout' at end of script, like this:

# exp_internal 1

# unset -nocomplain ::env(SSH_AUTH_SOCK)   ;# This one is session-bound anyway
# puts[list array set ::env [array get ::env]]

# set env(PATH) "/home/dj/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin"

set verbose 0
set env(TERM) vt100
set env(SHELL) /bin/bash
set env(HOME) /home/dj

#If it all goes pear shaped the script will timeout after 5 seconds.
set timeout 5
#assigned to the variable name
set name [lindex $argv 0]
#assigned to the variable password
set password "eqz0fsRMBsnjihy"
#This spawns the telnet program and connects it to the variable name
spawn /usr/bin/telnet $name 
#The script expects Password
expect "Password: "
#The script sends the password variable
send "$password\n"
send "sys diag\n"
send "show all\n"
send "ip status\n"
send "ip route status\n"
send "ip arp status\n"
send "ip ifconfig\n"
send "wan adsl linedata near\n"
send "wan adsl linedata far\n"
send "wan adsl txgain\n"
send "wan adsl farituid\n"
send "wan adsl nearituid\n"
send "sys countrycode\n"
send "sys atsh\n"
send "sys upnp display\n"
send "show wan adsl annex\n"
send "show wan adsl opmode\n"
send "wan adsl txfilter\n"
send "wan adsl targetnoise\n"
send "exit\n"

# send "sys view\n\n"

#This hands control of the keyboard over to you (Nice expect feature!)
# interact
expect_after timeout {puts "Timeout, exiting....";exit 0}
expect eof

# set reboot
# sys diag
# sys view
# sys log disp  y/n?
# send "sys display\n"
# iskljuci wifi:  rtwlan disableap

Last edited by qrange; 07-09-2019 at 07:14 AM.


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