Expect command to send the user input enter or ctrl+c


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Expect command to send the user input enter or ctrl+c
# 1  
Old 05-07-2018
Expect command to send the user input enter or ctrl+c

Hey All,

I am writing one script using expect, that script which is used in spawn will accepts only 1. Enter 2. Ctrl+c

Press Control-C to exit, Enter to proceed.

Could some one share some thoughts to send the above user inputs in linux expect block ?

Thanks,
Sam
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Automatically enter input in command line

Hi, This is a script which to create an opvn user, I want which answer automatically to a certain part so, I try this, it works without the red part but I must type manually.. : #!/bin/bash ## Environnement ## LC_ALL=C ## Paths ## rsa_dir="etc/openvpn/easy-rsa"... (10 Replies)
Discussion started by: Arnaudh78
10 Replies

2. Shell Programming and Scripting

Loop logic, enter into respective IF as per enter input file name

have three big data file, however I just need to see the mentioned below one line form the all the file which has SERVER_CONNECTION Value File 1 export SERVER_CONNECTION=//dvlna002:10001/SmartServer File2 export SERVER_CONNECTION=///SmartServer File3 export... (1 Reply)
Discussion started by: Nsharma3006
1 Replies

3. AIX

Send ctrl+C in expect script

Hi, Am trying to transfer file via FTP using expect script from server to client i need to interrupt the file transfer between server and client Please help what should used in expect code.. I used send "ctrl+c\r" expect "Aborted" but that didnt work.. I need what should... (3 Replies)
Discussion started by: Priya Amaresh
3 Replies

4. Shell Programming and Scripting

Command substitution in send/expect. Please help!

Hi, the following code is not working. How can I cat the last modified file in the path /asdf. Please help! expect "asdf%" {send "cat `ls -rt /asdf|tail -1` \r"} (2 Replies)
Discussion started by: thulasidharan2k
2 Replies

5. Shell Programming and Scripting

Expect script without user seeing output or input

I want a shell script to call an expect script but I want the expect script to run in the background so the user is not bothered with what is going on. Is there any way to do this? ---------- Post updated at 08:23 PM ---------- Previous update was at 07:39 PM ---------- got it it was ... (1 Reply)
Discussion started by: los21282
1 Replies

6. UNIX for Dummies Questions & Answers

Ctrl-enter doesn't work when running Midnight Commander in xterm

When running MC in xterm or gnome-terminal, it doesn't seem to allow the use of Ctrl-enter and Ctr-shift-enter to copy marked files to the command line. Does anyone know of another way to cause this to happen or a way to enable it under xterm/gnome-term? With thanks, Narnie (0 Replies)
Discussion started by: Narnie
0 Replies

7. Shell Programming and Scripting

How to send Ctrl Break combination in Expect

Greetings, I am writing an Expect script to automate multiple processes on an HP-UX system. Everything has gone fine so far but I now have run into a problem. One of the processes that I'm trying to automate requires the key combination of ctrl break and I have so far been unable to figure out... (1 Reply)
Discussion started by: g_trueblood2000
1 Replies

8. Shell Programming and Scripting

How to issue ctrl+D and enter key

My problem is that i have to connect Linux server. I can connect it with SSH but because of the software of the Linux server, i need to press enter and after ctrl+D. Therefore, I need to write a script that should press enter and ctrl+D. How can i write it in KSH shell script. HELP ME! (7 Replies)
Discussion started by: fozay
7 Replies

9. Shell Programming and Scripting

BASH: Any Way to Get User Input Without Requiring Them to Hit the Enter Key?

I'm working on making a menu system on an HP-UX box with Bash on it. The old menu system presents the users with a standard text menu with numbers to make selections. I'm re-working the system and I would like to provide something more akin to iterative search in Emacs. I have a list of 28... (2 Replies)
Discussion started by: deckard
2 Replies

10. Shell Programming and Scripting

Use Send command of Expect package

HI All, I am currently working on one command line application on AIX (Unix Platform).Here i need to use Expect package. By using Expect package at the top of the script,i want to use just Send command of Expect package to send characters like, 1. Press Enter key 2. Press spacebar 3.... (6 Replies)
Discussion started by: neha123
6 Replies
Login or Register to Ask a Question
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)