expect script to ssh returns invalid command name -

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i trying write expect script ssh server, send sudo su, check iptables status , put output in log file on server. below script.

1 #!/usr/bin/expect   2 exp_internal 1   3 log_user 0   4 set timeout 10   5 set password  "******"   6    7 spawn /usr/bin/ssh -l subhasish *.*.*.* -p 10022   8    9 expect {  10      -re "password: " {send "$password\r"}  11      -re "$ "  {send "sudo su\r"}  12      -re "[sudo] password subhasish:" {send "$password\r"}  13      -re "# "  {send "service iptables status\r"}  14        }  15 set output $expect_out(buffer)  16 send "exit\r"  17 puts "$output\r\n" >> output.log

but while run in debug mode, getting error this;

expect -d testcase expect version 5.44.1.15 argv[0] = expect  argv[1] = -d  argv[2] = testcase   set argc 0 set argv0 "testcase" set argv "" executing commands command file testcase parent: waiting sync byte parent: telling child go ahead parent: unsynchronized child spawn: returns {24105} invalid command name "sudo"     while executing "sudo"     invoked within "expect {      -re "password: " {send "$password\r"}      -re "$ "  {send "sudo su\r"}      -re "[sudo] password subhasish:" {send "$password\r"}  ..."     (file "testcase" line 9)

not sure going wrong. says invalid command name "sudo", guess because expect doesn;t understand these command. how go around it. please help. thanks.

the problem in line

-re "[sudo] password subhasish:" {send "$password\r"}

in tcl (and hence in expect) square brackets syntax command substitution (like backticks in shell). either need escape brackets or use different quotes prevent various expansions:

-re {[sudo] password subhasish:} {send "$password\r"}

that brings different issue: expecting see these exact characters? because you're instructing expect treat regular expression, , square brackets in regular expression means character class, match single character, either 's', 'u', 'd' or 'o'. need this:

-re {\[sudo\] password subhasish:} {send "$password\r"}

or 

-ex {[sudo] password subhasish:} {send "$password\r"}

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