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Top Forums Shell Programming and Scripting within shell script send expect and if else Post 302309991 by drl on Thursday 23rd of April 2009 11:22:19 AM
Old 04-23-2009
Hi.

Here is an expect script that connects and then checks for a file t2. Perhaps this will help until someone more knowledgeable stops by:
Code:
#!/usr/bin/expect --

# @(#) e4       Demonstrate running commands on remote computer with expect.

# Identify local computer, version of expect.
puts " Local computer is [eval exec uname -n]"
puts " Version of expect is [exp_version]."
puts ""
# Read login-name, computer-name, password from file.
set file "data1"
if { ! [file exists $file] } {
  puts " File $file not found -- exiting."
  exit 1
}
set input [open $file "r"]
set line [gets $input]
set list [split $line]
set login [lindex $list 0]
set box [lindex $list 1]
set password [lindex $list 2]
puts " login is $login, intended remote computer is $box"
set timeout 10
send_user " spawning: ssh $login@$box\n"
spawn ssh $login@$box
expect \[pP]assword:*
send "$password\r"
# send_user "(Got string Password*, sent password $password.)\n"
expect *$box*
# send "ls\r"
send {
bash <<EOF
echo " Hi from a here document on computer $(uname -n)."
if [ ! -f t2 ]
then
  echo " There is no file t2, creating it."
  touch t2
else
  echo " File t2 exists, using it."
fi
ls -l t2
rm t2
EOF
}
expect *$box*
send "exit\r"
expect "logout*"

Producing:
Code:
% ./e4
 Local computer is leap
 Version of expect is 5.42.1.

 login is vanilla, intended remote computer is vm-lenny
 spawning: ssh vanilla@vm-lenny
spawn ssh vanilla@vm-lenny
vanilla@vm-lenny's password:
Linux vm-lenny 2.6.26-2-686 #1 SMP Thu Mar 26 01:08:11 UTC 2009 i686

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Thu Apr 23 09:37:28 2009 from leap

bash <<EOF
echo " Hi from a here document on computer $(uname -n)."
if [ ! -f t2 ]
then
  echo " There is no file t2, creating it."
  touch t2
else
  echo " File t2 exists, using it."
fi
ls -l t2
rm t2
EOF
vanilla@vm-lenny:~$
vanilla@vm-lenny:~$ bash <<EOF
> echo " Hi from a here document on computer $(uname -n)."
> if [ ! -f t2 ]
> then
>   echo " There is no file t2, creating it."
>   touch t2
> else
>   echo " File t2 exists, using it."
> fi
> ls -l t2
> rm t2
> EOF
 Hi from a here document on computer vm-lenny.
 There is no file t2, creating it.
-rw-r--r-- 1 vanilla vanilla 0 2009-04-23 10:13 t2
vanilla@vm-lenny:~$ exit
logout

If you are going to use expect extensively, I suggest the book below ... cheers, drl

Quote:
Title: Exploring Expect
Subtitle: A Tcl-based Toolkit for Automating Interactive Programs
Author: Don Libes
Edition: First
Date: December 1994
Publisher: O'Reilly
ISBN: 1-56592-090-2
Pages: 602
Categories: scripting, interacting, automating, system administration
Comments: 3.5 stars (25 reviews) Amazon.com: Online Shopping for Electronics, Apparel, Computers, Books, DVDs & more
Comments: elderly book, but still useful
 

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d_passwd(4)							   File Formats 						       d_passwd(4)

NAME
d_passwd - dial-up password file SYNOPSIS
/etc/d_passwd DESCRIPTION
A dial-up password is an additional password required of users who access the computer through a modem or dial-up port. The correct pass- word must be entered before the user is granted access to the computer. d_passwd is an ASCII file which contains a list of executable programs (typically shells) that require a dial-up password and the associ- ated encrypted passwords. When a user attempts to log in on any of the ports listed in the dialups file (see dialups(4)), the login program looks at the user's login entry stored in the passwd file (see passwd(4)), and compares the login shell field to the entries in d_passwd. These entries determine whether the user will be required to supply a dial-up password. Each entry in d_passwd is a single line of the form: login-shell:password: where login-shell The name of the login program that will require an additional dial-up password. password An encrypted password. Users accessing the computer through a dial-up port or modem using login-shell will be required to enter this password before gaining access to the computer. d_passwd should be owned by the root user and the root group. The file should have read and write permissions for the owner (root) only. If the user's login program in the passwd file is not found in d_passwd or if the login shell field in passwd is empty, the user must sup- ply the default password. The default password is the entry for /usr/bin/sh. If d_passwd has no entry for /usr/bin/sh, then those users whose login shell field in passwd is empty or does not match any entry in d_passwd will not be prompted for a dial-up password. Dial-up logins are disabled if d_passwd has only the following entry: /usr/bin/sh:*: EXAMPLES
Example 1: Sample d_passwd file. Here is a sample d_passwd file: /usr/lib/uucp/uucico:q.mJzTnu8icF0: /usr/bin/csh:6k/7KCFRPNVXg: /usr/bin/ksh:9df/FDf.4jkRt: /usr/bin/sh:41FuGVzGcDJlw: Generating An Encrypted Password The passwd (see passwd(1)) utility can be used to generate the encrypted password for each login program. passwd generates encrypted pass- words for users and places the password in the shadow (see shadow(4)) file. Passwords for the d_passwd file will need to be generated by first adding a temporary user id using useradd (see useradd(1M)), and then using passwd(1) to generate the desired password in the shadow file. Once the encrypted version of the password has been created, it can be copied to the d_passwd file. For example: 1. Type useradd tempuser and press Return. This creates a user named tempuser. 2. Type passwd tempuser and press Return. This creates an encrypted password for tempuser and places it in the shadow file. 3. Find the entry for tempuser in the shadow file and copy the encrypted password to the desired entry in the d_passwd file. 4. Type userdel tempuser and press Return to delete tempuser. These steps must be executed as the root user. FILES
/etc/d_passwd dial-up password file /etc/dialups list of dial-up ports requiring dial-up passwords /etc/passwd password file /etc/shadow shadow password file SEE ALSO
passwd(1), useradd(1M), dialups(4), passwd(4), shadow(4) WARNINGS
When creating a new dial-up password, be sure to remain logged in on at least one terminal while testing the new password. This ensures that there is an available terminal from which you can correct any mistakes that were made when the new password was added. SunOS 5.10 2 Sep 2004 d_passwd(4)
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