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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 302873813 by thisissouvik on Wednesday 13th of November 2013 08:00:24 AM
Old 11-13-2013
Thanks in2nix, ~XL for your valuable inputs Smilie

Tried tweaking in2nix's code to allign to my reqd with the following 'expect' code:

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

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

# get host name from command-line
set h [lindex $argv 0]

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

# 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"

# scp the data onto NIM server
spawn -noecho scp $u@$h:/export/home/msouvik/echo.out .

# done
expect eof

And then applied the below 'while' loop:

Code:
while read h
> do
> expect_script.sh $h
> done < lsnim

Below is the error I get while the script tries to create a /export/home/msouvik/echo.out.$h file on the target servers:

==[ Error ]==
msouvik@my_target_server1 password: msouvik@my_target_server1 password:
scp: /export/home/msouvik/echo.out.my_target_server1: No such file or directory

msouvik@my_target_server2 password: msouvik@my_target_server2 password:
scp: /export/home/msouvik/echo.out.my_target_server2: No such file or directory
==

Find it really weird 'coz the script is not able to create a file named /export/home/msouvik/echo.out.$h on the target servers, however it is able to do so without the $h suffix to the filename.

Any leads pls?


-- Souvik
P.S: I'll try to understand XL's script before I implement it tomorrow Smilie
 

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SHELL-QUOTE(1)						User Contributed Perl Documentation					    SHELL-QUOTE(1)

NAME
shell-quote - quote arguments for safe use, unmodified in a shell command SYNOPSIS
shell-quote [switch]... arg... DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands or files with embedded white space or shell globbing characters safely. Here are a few examples. EXAMPLES
ssh preserving args When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and passes them to "$SHELL -c". This doesn't work as intended: ssh host touch 'hi there' # fails It creates 2 files, hi and there. Instead, do this: cmd=`shell-quote touch 'hi there'` ssh host "$cmd" This gives you just 1 file, hi there. process find output It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote: eval set -- `find -type f -print0 | xargs -0 shell-quote --` debug shell scripts shell-quote is better than echo for debugging shell scripts. debug() { [ -z "$debug" ] || shell-quote "debug:" "$@" } With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can. save a command for later shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are things the user can't pass through), you can do something like this: user_switches= while [ $# != 0 ] do case x$1 in x--pass-through) [ $# -gt 1 ] || die "need an argument for $1" user_switches="$user_switches "`shell-quote -- "$2"` shift;; # process other switches esac shift done # later eval "shell-quote some-command $user_switches my args" OPTIONS
--debug Turn debugging on. --help Show the usage message and die. --version Show the version number and exit. AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions. AUTHOR
Roderick Schertler <roderick@argon.org> perl v5.16.3 2010-06-11 SHELL-QUOTE(1)
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