topic Re: expect problems changing password in Operating System - HP-UX

expect problems changing password

Mark Greene_1 — Thu, 25 Mar 2004 15:53:57 GMT

I have the following expect commaned embedded within a ksh script:

reset_password() {
UNAME=$LoginID
UPASS=$NEWPASS

/usr/local/bin/expect -d < set timeout -1
match_max 100000
spawn passwd $UNAME\r
expect -exact "Changing password for testuser\r
New password: "
send "$UPASS\r"
expect "Re-enter new password:"
send "$UPASS\r"
send "exit\r"
EOF

return $?
}

I am getting this output from the expect debugger:

expect version 5.39.0
argv[0] = /usr/local/bin/expect argv[1] = -d
set argc 0
set argv0 "/usr/local/bin/expect"
set argv ""
executing commands from command file
spawn passwd testuser
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {26705}

expect: does "" (spawn_id exp6) match exact string "Changing password for testuser\r\nNew password: "? no
Invalid login name.

expect: does "Invalid login name.\r\n" (spawn_id exp6) match exact string "Changing password for testuser\r\nNew password: "? no
expect: read eof
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "Invalid login name.\r\n"
send: sending "test123\r" to { exp6 send: spawn id exp6 not open
while executing
"send "test123\r""

Looks like either a timing problem or a problem with too many or too few control characters on the "spawn" line. Can anyone tell me what to fix?

TIA
mark

Re: expect problems changing password

Mark Greene_1 — Fri, 26 Mar 2004 08:16:50 GMT

Back to top. I posted this late in the day yesterday and am not at all sure too many people saw this. I cannot believe I've uncovered anything unique here.

The user ID "testuser" does exist, and I can change the password for that ID interactively via sam or the commandline.

mark

Re: expect problems changing password

Francisco J. Soler — Fri, 26 Mar 2004 08:47:36 GMT

Hi Mark, i don't know expect, but in shell script sometimes the variable name needs braces around it.

For example:
the line
spawn passwd $UNAME\r will be:
spawn passwd ${UNAME}\r

and perhaps \n instead of \r

Frank.

Re: expect problems changing password

Chris Wilshaw — Fri, 26 Mar 2004 09:04:30 GMT

You're probably correct about the spawn line.

You should just need to use

spawn passwd $UNAME

(we use expect with some scripts via telnet using "spawn telnet $SERVER")

the "\r" is seen as a carriage return when using echo and a few other commands, but even then, it needs to be surrounded by quotes to be interpreted correctly.

You can see this behaviour using

echo "\r"

and

echo \r

Re: expect problems changing password

Mark Greene_1 — Fri, 26 Mar 2004 09:26:38 GMT

Taking the \r out of the spawn statement did it, thanks guys!

mark