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Top Forums Shell Programming and Scripting How to use 'expect' to pass UID & Password to a "for loop" in shell script? Post 302873415 by thisissouvik on Tuesday 12th of November 2013 05:14:09 AM
Old 11-12-2013
Hello in2nix,

Your basic expect based script did the ground work for me - could login to any server passing the hostname to parameter "h", so this is how my little modified script looks now:

Code:
#!/usr/bin/expect -f
#
#

# set credentials
set u "msouvik"
set p "pass^123"

# get host name from command-line
# set h "my_desired_server"

# set the command to run
set cmd "echo Hello Souvik!  >> /export/home/msouvik/echo.out"

# spawn a connection to the host and run the given command
spawn -noecho ssh -t $u@$h $cmd

# handle the password prompt
expect "?assword:*"
send -- "$p\r"
send -- "\r"

# done
expect eof

I could not manage to pass multiple server names to this expect script, the methods I tried --

1. Called this expect script from an external "for" & "while" loop -- got an obvious error of parameter "h" not found:
Code:
for h in `cat my_server_list`
do
<Path of above written expect script>
done

2. Added a "for" loop within the above expect script:
Code:
#!/usr/bin/expect -f
#
#
for h in `cat my_server_list`
do

# set credentials
set u "msouvik"
set p "pass^123"

# get host name from command-line
# set h ""

# set the command to run
set cmd "echo Hello Souvik!  >> /export/home/msouvik/echo.out"

# spawn a connection to the host and run the given command
spawn -noecho ssh -t $u@$h $cmd

# handle the password prompt
expect "?assword:*"
send -- "$p\r"
send -- "\r"

# done
expect eof

done

That failed since it couldn't understand expect syntaxe(s) within the for loop.

Please further suggest!


-- Souvik
 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)
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