expect example

#!/no_backup/ActiveTcl-8.6/bin/tclsh
package require Expect
# exp_internal 1
spawn /bin/sh
expect {$ }
send "ls -1\n"
expect \r\n
expect {
    -re {^([^\r\n]*\.tcl)\r} {
	set fname $expect_out(1,string)
	puts "Tcl file: $fname"
	exp_continue
    }
    -re {^([^\r\n]*)\r} {
	set fname $expect_out(1,string)
	puts "Non-Tcl file: $fname"
	exp_continue
    }
    -re {^[^\r\n]*\$ $} {
	puts "Got shell prompt again."
    }
    -re {[^\n]*\n} {
	exp_continue
    }
    timeout {
	puts "Timeout before all patterns matched."
    }
}
send exit\r\n
expect eof