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Full Discussion: Expect Script - While file exist
Top Forums UNIX for Dummies Questions & Answers Expect Script - While file exist Post 302244912 by ramen_noodle on Thursday 9th of October 2008 02:54:41 AM
Old 10-09-2008
Since you are driving the interaction remotely and possibly dealing with multiple logins concurrently the way I'd do this is to use an interact for each spawn_id (after successful setup) with a procedure that periodically polls the remote filesystem, makes the necessary changes and informs you of completion or error.

Here is a basic example from some code I wrote several years ago. You may want to check the interact examples out at the expect site and at active state.
Code:
spawn -noecho ssh -X root@$host


                       expect {
		                 
		              -re ".*asswor.*" {
			                   send $credentials\r\n
					   if {[info exists initcmd] && [string length $initcmd]} {send "$initcmd\r\n"}
					   if {[info exists cmdfile] && [string length $cmdfile]} {after 1000; feedCmdfile $spawn_id}
					   userMenu; stty echo
					   interact {
					             "~QQ" {rmvConnection $spawn_id}
						     "~AA" {
						           send_user "\nHostname: "
							   expect_user -re "(.*)\r.*" {set hostname $expect_out(1,string)}
							   send_user "\nUser: "
							   expect_user -re "(.*)\r.*" {set username $expect_out(1,string)}
							    if {![string compare [set id [addConnection $username $hostname]] "NUL"] == 0} {
							         iactInner $id
							    } else {
							           send_user "Connection to $hostname failed\n"
							    }	    
						           }
					             "~AF" {doFileAppend $spawn_id}		   		    
						     "~DF" {}
						     "~UF" {}
						     "~XX" {enterInterp $spawn_id}
						     "~MM" {userMenu}
				          }		     
			      }
			      
			      -re ".*\(yes.*no\)" {
			                   send "yes\r\n"
					   exp_continue
			      }
			      
			      -re ".*(#|>).*"  {
			      			if {[info exists initcmd] && [string length $initcmd]} {send "$initcmd\r\n"}
					        if {[info exists cmdfile] && [string length $cmdfile]} {after 1000; feedCmdfile $spawn_id}
					             userMenu; stty echo
					             interact {
					             "~QQ" {rmvConnection $spawn_id}
						     "~AA" {
						           send_user "\nHostname: "
							   expect_user -re "(.*)\r.*" {set hostname $expect_out(1,string)}
							   send_user "\nUser: "
							   expect_user -re "(.*)\r.*" {set username $expect_out(1,string)}
							    if {![string compare [set id [addConnection $username $hostname]] "NUL"] == 0} {
							         iactInner $id
							    } else {
							           send_user "Connection to $hostname failed\n"
							    }	    
						           }		    
						     "~DF" {}
						     "~UF" {}
						     "~XX" {enterInterp $spawn_id}
						     "~MM" {userMenu}
				          }		     
			      }
			      
			      eof {send_user "remote connection for $host has failed\n"}
			      timeout {send_user "Could not connect to $host..connect() timed out\n"}
		     }

 

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LEARN ABOUT REDHAT

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-a] [-f] [-q] [-t] [file]

DESCRIPTION

     Script makes a typescript of everything printed on your terminal.	It is useful for students who need a hardcopy record of an interactive
     session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

     If the argument file is given, script saves all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     Options:

     -a      Append the output to file or typescript, retaining the prior contents.

     -f      Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super-
	     vise real-time what is being done using `cat foo'.

     -q      Be quiet.

     -t      Output timeing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time
	     elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used
	     to replay typescripts with realistic typing and output delays.

     The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not
     set) for the C-shell, csh(1)).

     Certain interactive commands, such as vi(1), create garbage in the typescript file.  Script works best with commands that do not manipulate
     the screen, the results are meant to emulate a hardcopy terminal.

ENVIRONMENT

     The following environment variable is utilized by script:

     SHELL  If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most
	    shells set this variable automatically).

SEE ALSO

     csh(1) (for the history mechanism), replay(1).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     Script places everything in the log file, including linefeeds and backspaces.  This is not what the naive user expects.

Linux								   July 30, 2000							     Linux
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