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Top Forums Shell Programming and Scripting How to use 'expect' to pass UID & Password to a "for loop" in shell script? Post 302873415 by thisissouvik on Tuesday 12th of November 2013 05:14:09 AM
Old 11-12-2013
Hello in2nix,

Your basic expect based script did the ground work for me - could login to any server passing the hostname to parameter "h", so this is how my little modified script looks now:

Code:
#!/usr/bin/expect -f
#
#

# set credentials
set u "msouvik"
set p "pass^123"

# get host name from command-line
# set h "my_desired_server"

# set the command to run
set cmd "echo Hello Souvik!  >> /export/home/msouvik/echo.out"

# spawn a connection to the host and run the given command
spawn -noecho ssh -t $u@$h $cmd

# handle the password prompt
expect "?assword:*"
send -- "$p\r"
send -- "\r"

# done
expect eof

I could not manage to pass multiple server names to this expect script, the methods I tried --

1. Called this expect script from an external "for" & "while" loop -- got an obvious error of parameter "h" not found:
Code:
for h in `cat my_server_list`
do
<Path of above written expect script>
done

2. Added a "for" loop within the above expect script:
Code:
#!/usr/bin/expect -f
#
#
for h in `cat my_server_list`
do

# set credentials
set u "msouvik"
set p "pass^123"

# get host name from command-line
# set h ""

# set the command to run
set cmd "echo Hello Souvik!  >> /export/home/msouvik/echo.out"

# spawn a connection to the host and run the given command
spawn -noecho ssh -t $u@$h $cmd

# handle the password prompt
expect "?assword:*"
send -- "$p\r"
send -- "\r"

# done
expect eof

done

That failed since it couldn't understand expect syntaxe(s) within the for loop.

Please further suggest!


-- Souvik
 

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EXPECT_EXPECTL(3)							 1							 EXPECT_EXPECTL(3)

expect_expectl - Waits until the output from a process matches one of the patterns, a specified time period has passed, or anEOFis seen

SYNOPSIS
int expect_expectl (resource $expect, array $cases, [array &$match]) DESCRIPTION
Waits until the output from a process matches one of the patterns, a specified time period has passed, or an EOF is seen. If $match is provided, then it is filled with the result of search. The matched string can be found in $match[0]. The match substrings (according to the parentheses) in the original pattern can be found in $match[1], $match[2], and so on, up to $match[9] (the limitation of libexpect). PARAMETERS
o $expect - An Expect stream, previously opened with expect_popen(3). o $cases - An array of expect cases. Each expect case is an indexed array, as described in the following table: Expect Case Array +----------+--------------------------+---+---+---+ |Index Key | | | | | | | | | | | | | Value Type | | | | | | | | | | | | Description | | | | | | | | | | | | Is Mandatory | | | | | | | | | | | | Default Value | | | | | | | | | | +----------+--------------------------+---+---+---+ | 0 | | | | | | | | | | | | | string | | | | | | | | | | | | pattern, that will be | | | | | | matched against the out- | | | | | | put from the stream | | | | | | | | | | | | yes | | | | | | | | | | | | | | | | | | T{ 1 | | | | | | | | | | | | mixed | | | | | | | | | | | | value, that will be | | | | | | returned by this func- | | | | | | tion, if the pattern | | | | | | matches | | | | | | | | | | | | yes | | | | | | | | | | | | | | | | | | T{ 2 | | | | | | | | | | | | integer | | | | | | | | | | | | pattern type, one of: | | | | | | EXP_GLOB, EXP_EXACT or | | | | | | EXP_REGEXP | | | | | | | | | | | | no | | | | | | | | | | | | | | | | | | EXP_GLOB | | | | | | | | | | +----------+--------------------------+---+---+---+ RETURN VALUES
Returns value associated with the pattern that was matched. On failure this function returns: EXP_EOF, EXP_TIMEOUT or EXP_FULLBUFFER CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 0.2.1 | | | | | | | Prior to version 0.2.1, in $match parameter a | | | match string was returned, not an array of match | | | substrings. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 expect_expectl(3) example <?php // Copies file from remote host: ini_set("expect.timeout", 30); $stream = fopen("expect://scp user@remotehost:/var/log/messages /home/user/messages.txt", "r"); $cases = array( // array(pattern, value to return if pattern matched) array("password:", "asked for password"), array("yes/no)?", "asked for yes/no") ); while (true) { switch (expect_expectl($stream, $cases)) { case "asked for password": fwrite($stream, "my password "); break; case "asked for yes/no": fwrite($stream, "yes "); break; case EXP_TIMEOUT: case EXP_EOF: break 2; // break both the switch statement and the while loop default: die "Error has occurred!"; } } fclose($stream); ?> SEE ALSO
expect_popen(3). PHP Documentation Group EXPECT_EXPECTL(3)
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