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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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ct_ftp(3erl)						     Erlang Module Definition						      ct_ftp(3erl)

NAME
ct_ftp - FTP client module (based on the FTP support of the INETS application). DESCRIPTION
FTP client module (based on the FTP support of the INETS application). DATA TYPES
connection() = handle() | target_name() (see module ct) : handle() = handle() (see module ct_gen_conn) : Handle for a specific ftp connection. EXPORTS
cd(Connection, Dir) -> ok | {error, Reason} Types Connection = connection() Dir = string() Change directory on remote host. close(Connection) -> ok | {error, Reason} Types Connection = connection() Close the FTP connection. delete(Connection, File) -> ok | {error, Reason} Types Connection = connection() File = string() Delete a file on remote host get(KeyOrName, RemoteFile, LocalFile) -> ok | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) RemoteFile = string() LocalFile = string() Open a ftp connection and fetch a file from the remote host. RemoteFile and LocalFile must be absolute paths. The config file must be as for put/3. See also: put/3 . ls(Connection, Dir) -> {ok, Listing} | {error, Reason} Types Connection = connection() Dir = string() Listing = string() List the directory Dir. open(KeyOrName) -> {ok, Handle} | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) Handle = handle() Open an FTP connection to the specified node. You can open one connection for a particular Name and use the same name as reference for all subsequent operations. If you want the connection to be associated with Handle instead (in case you need to open multiple connections to a host for example), simply use Key , the configuration variable name, to specify the target. Note that a connection that has no associated target name can only be closed with the handle value. put(KeyOrName, LocalFile, RemoteFile) -> ok | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) LocalFile = string() RemoteFile = string() Open a ftp connection and send a file to the remote host. LocalFile and RemoteFile must be absolute paths. If the target host is a "special" node, the ftp address must be specified in the config file like this: {node,[{ftp,IpAddr}]}. If the target host is something else, e.g. a unix host, the config file must also include the username and password (both strings): {unix,[{ftp,IpAddr}, {username,Username}, {password,Password}]}. recv(Connection, RemoteFile) -> ok | {error, Reason} Fetch a file over FTP. The file will get the same name on the local host. See also: recv/3 . recv(Connection, RemoteFile, LocalFile) -> ok | {error, Reason} Types Connection = connection() RemoteFile = string() LocalFile = string() Fetch a file over FTP. The file will be named LocalFile on the local host. send(Connection, LocalFile) -> ok | {error, Reason} Send a file over FTP. The file will get the same name on the remote host. See also: send/3 . send(Connection, LocalFile, RemoteFile) -> ok | {error, Reason} Types Connection = connection() LocalFile = string() RemoteFile = string() Send a file over FTP. The file will be named RemoteFile on the remote host. type(Connection, Type) -> ok | {error, Reason} Types Connection = connection() Type = ascii | binary Change file transfer type AUTHORS
<> common_test 1.5.3 ct_ftp(3erl)
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