topic Re: Expect script beginners help in Operating System - HP-UX

Expect script beginners help

F_8 — Thu, 21 Aug 2003 03:42:30 GMT

Hi,

I am trying to write an expect script that telnets into a server captures the size of a file within the server and then doe s a number of actions based on the size of the file. How do I capture this information. I know I do the following

send -- "telnet 111.111.111.111\r"
do all of the login stuff
....

send -- "ls -l test.raw"

how do I capture the response of this, also how can I use expect to write to a file on my system.

Thanks in advance

Re: Expect script beginners help

RAC_1 — Thu, 21 Aug 2003 05:19:13 GMT

You can telnet to a box with password.

(you can use remsh, or secure ssh to login without password)

For sessions like telnet you can use utility expect to do this. Then you put your stuuf for file checking.

Hope this helps.

Re: Expect script beginners help

F_8 — Thu, 21 Aug 2003 05:24:01 GMT

Thanks,

I'm actually more concerned with how I can isolate the size of the file and also analyse it using an if statement.

ie if(filesize < 160) then (......)
else(

)

but I'm not sure how I can get the size out of the string ie rwx--r-- directory directory 123 Aug 19 15:13 test.raw

I hope you can help;

Re: Expect script beginners help

F_8 — Thu, 21 Aug 2003 05:24:11 GMT

Re: Expect script beginners help

RAC_1 — Thu, 21 Aug 2003 05:37:09 GMT

ll test.raw|awk '{print $5}' --> to get the file size.

Re: Expect script beginners help

curt larson_1 — Thu, 21 Aug 2003 06:02:33 GMT

set filesize [ file size yourFileName ]

if $filesize < 160 {
do stuff
}

Re: Expect script beginners help

curt larson_1 — Thu, 21 Aug 2003 06:10:53 GMT

write to a file:

set file [open /dir/file w]
puts $file "Hello World" ;# writes to /dir/file
close $file

Re: Expect script beginners help

Donny Jekels — Thu, 21 Aug 2003 16:21:45 GMT

here is a nice tool.

Re: Expect script beginners help

F_8 — Thu, 21 Aug 2003 22:12:13 GMT

My expect script contains the following:

send -- "telnet 111.111.111.111\r"
expect -exact "login:"

send -- "username\r"
expect -exact "Password: "

send -- "password\r"
expect -exact "\$"

send -- "cd /home/username\r"
expect -exact "\$ "

send -- "ls -l test.raw\r"

ll test.raw|awk '{print $5}'

When I run it I get the following result:

$ can't read "5": no such variable
while executing
"ll test.raw|awk '{print $5}'"
(file "./script.exp" line 35)

What have I done wrong?

Re: Expect script beginners help

curt larson_1 — Thu, 21 Aug 2003 22:58:41 GMT

the core of expect's language facilites are
provided by Tcl, a language used by many other tools. Your scripts needs to use tcl's syntax.

ll test.raw|awk '{print $5}' isn't in tcl's syntax. it is a unix shell command. they are not the same.

this is probably more what your wanting to do

expect -re "^.*$"
sent "ll test.raw|awk '{print $5}'"
set size $expect_out(0,string)
puts "file size = $size"

when the matching string is finally typed
expect returns. But, before returning, expect
stores the matched characters in a variable
called expect_out(0,string)

Re: Expect script beginners help

curt larson_1 — Thu, 21 Aug 2003 23:12:53 GMT

a quoting hint

variable substitution, command substitution,
and backslash substitution all occur as usual
inside of double quotes.

variable substitution is triggered by a
dollar sign ($) character and causes the
value of a tcl variable to be inserted into
a word.

sent "ll test.raw|awk '{print $5}'"
what is happening to $5