Autosys/Cron job to download ftp files with expect

Expect is a program that "talks" to other interactive programs according to a script. Expect reads cmdfile for a list of commands to execute.
following commands are available under expect package.

• spawn - starts a process
• send  - sends to a process
• expect - waits for output from a process
• interact - lets you interact with a process

Example auto download scrit using expect which connects with other ftp server and download the define files.

#!/usr/local/bin/expect

spawn /usr/local/bin/sftp user_name@ftp.server.com

expect "Password:"

send "password\r"

expect "sftp>"

send "cd /documents/downloadfiles\r"

expect "sftp>"

send "mget O_UEN*.XML \r "

expect "sftp>"

send "mget O_UL*.XML \r "

expect "sftp>"

send "mget O_UF*.XML \r "

expect "sftp>"

send "mget O_AUDIT.XML \r "

expect "sftp>"

send "bye\r"

The first line is the command interpreter.Then its Wait for the input and send the output. If we don't know the output of the next line , means if we don't know
the expect line then we can use "autoexpect" package instead of "expect" package.