10 More Discussions You Might Find Interesting
1. Programming
I'm fairly new to scripting so this might not be possible.
I am using Expect with Cisco switches and need to capture the string after finding the expect request. For example, when I issue "show version" on a Nexus switch, I'm looking to capture the current firmware version:
#show version
... (0 Replies)
Discussion started by: IBGaryA
0 Replies
2. Shell Programming and Scripting
Dear All,
I have a requirement where I have to SFTP or SCP a file in a batch script. Unfortunately, the destination server setup is such that it doesn't allow for shell command line login. So, I am not able to set up SSH keys. My source server is having issues with Expect. So, unable to use... (5 Replies)
Discussion started by: ss112233
5 Replies
3. Programming
I have an expect script called remote that I want to call from inside my expect script called sudoers.push, here is the code that is causing me issues:
set REMOTE "/root/scripts/remote"
...
log_user 1
send_user "Executing remote script as $user...\n"
send_user "Command to execute is: $REMOTE... (1 Reply)
Discussion started by: brettski
1 Replies
4. UNIX for Advanced & Expert Users
Not able to execute the file in remote host using except utility
I am automating the SFTP keys setp process:
So i created the expect script for controlling the output of shell
below is my main code:
Code:
#!/usr/bin/expect
set fd
set password
close $fd
set df
set app
close $df... (1 Reply)
Discussion started by: Manoj Bajpai
1 Replies
5. Programming
Hi,
Am very new to expect scripting..
Can You please suggest me how to call an expect script inside another expect script..
I tried with
spawn /usr/bin/ksh
send "expect main.exp\r"
expect $root_prompt
and
spawn /usr/bin/ksh
send "main.exp\r"
expect $root_prompt
Both... (1 Reply)
Discussion started by: Priya Amaresh
1 Replies
6. Shell Programming and Scripting
Hey all. Sometimes I'm tasked to change some router configs for the entire network (over 3,000 Cisco routers). Most of the time its a global config parameter so its done with a loop and an IP list as its the same configuration change for all routers. This is working OK.
However, sometimes an... (3 Replies)
Discussion started by: mrkz1974
3 Replies
7. Shell Programming and Scripting
Hi all,
I'm new with expect. I'm developing a quick script to check my sudo access on 100 servers.
So using !/bin/usr/expect doesn't work. So decided to use it as :
expect -c "set timeout -1;\
spawn ssh $IPADDR -l $USERID ;\
match_max 100000;\
expect {
-re... (0 Replies)
Discussion started by: EmersonOrci
0 Replies
8. Shell Programming and Scripting
This Expect script provides expect with a list of IP addresses to Cisco IPS sensors and commands to configure Cisco IPS sensors. The user, password, IP addresses, prompt regex, etc. have been anonymized. In general this script will log into the sensors and send commands successfully but there are... (1 Reply)
Discussion started by: genewolfe
1 Replies
9. Shell Programming and Scripting
Here is a snippet of code that work for me:
expect "abc" {send_log "abc found" } \
"def" {send_log "def found" } \
"123" {send_log "123 found}
however the following does not and according to the book "Exploring Expect" it should be equivalent:
expect { "abc"... (1 Reply)
Discussion started by: twk
1 Replies
10. Shell Programming and Scripting
Hello to all...this is my first post (so please go easy). :)
I feel pretty solid at expect scripting, but I'm running into an issue that I'm not able to wrap my head around. I wrote a script that is a little advanced for logging into a remote Linux machine and changing text in a file using sed.... (2 Replies)
Discussion started by: v1k0d3n
2 Replies
AUTOEXPECT(1) General Commands Manual AUTOEXPECT(1)
NAME
autoexpect - generate an Expect script from watching a session
SYNOPSIS
autoexpect [ args ] [ program args... ]
INTRODUCTION
autoexpect watches you interacting with another program and creates an Expect script that reproduces your interactions. For straightline
scripts, autoexpect saves substantial time over writing scripts by hand. Even if you are an Expect expert, you will find it convenient to
use autoexpect to automate the more mindless parts of interactions. It is much easier to cut/paste hunks of autoexpect scripts together
than to write them from scratch. And if you are a beginner, you may be able to get away with learning nothing more about Expect than how
to call autoexpect.
The simplest way to use autoexpect is to call it from the command line with no arguments. For example:
% autoexpect
By default, autoexpect spawns a shell for you. Given a program name and arguments, autoexpect spawns that program. For example:
% autoexpect ftp ftp.cme.nist.gov
Once your spawned program is running, interact normally. When you have exited the shell (or program that you specified), autoexpect will
create a new script for you. By default, autoexpect writes the new script to "script.exp". You can override this with the -f flag fol-
lowed by a new script name.
The following example runs "ftp ftp.cme.nist.gov" and stores the resulting Expect script in the file "nist".
% autoexpect -f nist ftp ftp.cme.nist.gov
It is important to understand that autoexpect does not guarantee a working script because it necessarily has to guess about certain things
- and occasionally it guesses wrong. However, it is usually very easy to identify and fix these problems. The typical problems are:
o Timing. A surprisingly large number of programs (rn, ksh, zsh, telnet, etc.) and devices (e.g., modems) 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.
You can force this behavior throughout by overriding the variable "force_conservative" near the beginning of the generated
script. This "conservative" mode makes autoexpect automatically pause briefly (one tenth of a second) before sending each char-
acter. This pacifies every program I know of.
This conservative mode is useful if you just want to quickly reassure yourself that the problem is a timing one (or if you
really don't care about how fast the script runs). This same mode can be forced before script generation by using the -c flag.
Fortunately, these timing spots are rare. For example, telnet ignores characters only after entering its escape sequence.
Modems only ignore characters immediately after connecting to them for the first time. A few programs exhibit this behavior all
the time but typically have a switch to disable it. For example, rn's -T flag disables this behavior.
The following example starts autoexpect in conservative mode.
autoexpect -c
The -C flag defines a key to toggle conservative mode. The following example starts autoexpect (in non-conservative mode) with
^L as the toggle. (Note that the ^L is entered literally - i.e., enter a real control-L).
autoexpect -C ^L
The following example starts autoexpect in conservative mode with ^L as the toggle.
autoexpect -c -C ^L
o Echoing. Many program echo characters. For example, if you type "more" to a shell, what autoexpect actually sees is:
you typed 'm',
computer typed 'm',
you typed 'o',
computer typed 'o',
you typed 'r',
computer typed 'r',
...
Without specific knowledge of the program, it is impossible to know if you are waiting to see each character echoed before typ-
ing the next. If autoexpect sees characters being echoed, it assumes that it can send them all as a group rather than inter-
leaving them the way they originally appeared. This makes the script more pleasant to read. However, it could conceivably be
incorrect if you really had to wait to see each character echoed.
o Change. Autoexpect records every character from the interaction in the script. This is desirable because it gives you the
ability to make judgements about what is important and what can be replaced with a pattern match.
On the other hand, if you use commands whose output differs from run to run, the generated scripts are not going to be correct.
For example, the "date" command always produces different output. So using the date command while running autoexpect is a sure
way to produce a script that will require editing in order for it to work.
The -p flag puts autoexpect into "prompt mode". In this mode, autoexpect will only look for the the last line of program output
- which is usually the prompt. This handles the date problem (see above) and most others.
The following example starts autoexpect in prompt mode.
autoexpect -p
The -P flag defines a key to toggle prompt mode. The following example starts autoexpect (in non-prompt mode) with ^P as the
toggle. Note that the ^P is entered literally - i.e., enter a real control-P.
autoexpect -P ^P
The following example starts autoexpect in prompt mode with ^P as the toggle.
autoexpect -p -P ^P
OTHER FLAGS
The -quiet flag disables informational messages produced by autoexpect.
The -Q flag names a quote character which can be used to enter characters that autoexpect would otherwise consume because they are used as
toggles.
The following example shows a number of flags with quote used to provide a way of entering the toggles literally.
autoexpect -P ^P -C ^L -Q ^Q
STYLE
I don't know if there is a "style" for Expect programs but autoexpect should definitely not be held up as any model of style. For example,
autoexpect uses features of Expect that are intended specifically for computer-generated scripting. So don't try to faithfully write
scripts that appear as if they were generated by autoexpect. This is not useful.
On the other hand, autoexpect scripts do show some worthwhile things. For example, you can see how any string must be quoted in order to
use it in a Tcl script simply by running the strings through autoexpect.
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
expect and autoexpect are in the public domain. NIST and I would appreciate credit if these programs or parts of them are used.
30 June 1995 AUTOEXPECT(1)