Jano,
Linux includes a program called Expect that you can use to run such a
script. Here is one we use and run from crontab:
#!/usr/bin/expect -f
#
# This Expect script was generated by autoexpect on Tue May 7 17:00:23
2002
# Expect and autoexpect were both written by Don Libes, NIST.
#
# Note that autoexpect does not guarantee a working script. It
# necessarily has to guess about certain things. Two reasons a script
# might fail are:
#
# 1) timing - A surprising number of programs (rn, ksh, zsh, telnet,
# etc.) and devices discard or ignore keystrokes that arrive "too
# quickly" after prompts. If you find your new script hanging up at
# one spot, try adding a short sleep just before the previous send.
# Setting "force_conservative" to 1 (see below) makes Expect do this
# automatically - pausing briefly before sending each character. This
# pacifies every program I know of. The -c flag makes the script do
# this in the first place. The -C flag allows you to define a
# character to toggle this mode off and on.
set force_conservative 0 ;# set to 1 to force conservative mode even if
;# script wasn't run conservatively originally
if {$force_conservative} {
set send_slow {1 .1}
proc send {ignore arg} {
sleep .1
exp_send -s -- $arg
}
}
#
# 2) differing output - Some programs produce different output each time
# they run. The "date" command is an obvious example. Another is
# ftp, if it produces throughput statistics at the end of a file
# transfer. If this causes a problem, delete these patterns or replace
# them with wildcards. An alternative is to use the -p flag (for
# "prompt") which makes Expect only look for the last line of output
# (i.e., the prompt). The -P flag allows you to define a character to
# toggle this mode off and on.
#
# Read the man page for more info.
#
# -Don
set timeout -1
spawn $env(SHELL)
match_max 100000
expect -exact ">"
send -- "/usr/bin/telnet 10.10.10.1\r"
expect -exact "Username: "
send -- "cisco\r"
expect -exact "Password: "
send -- "password\r"
expect -exact ">"
send -- "en\r"
expect -exact "Password: "
send -- "enablepassword\r"
expect -exact "#"
send -- "show proc cpu\r"
send -- "q"
expect -exact "#"
send -- "exit\r"
There's quite a bit of documentation on the web for Expect.
Good Luck
Debbie
On Tue, 1 Jul 2003, - jvd wrote:
> Hello,
>
> I've seen before people refer to scripts. What exactly is this script? Is
it
> a little program that executes for eg. every 1min., telnets to the router,
> do a show proc cpu and then exits?
>
> Let's say I want to run this script on Linux because I can schedule it with
> crontab, in what programming language do you write the scripts?
>
> Regards,
> Jans
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=71777&t=71536
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