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Full Discussion: Plink (processing multiple commands) using Bash
Top Forums Shell Programming and Scripting Plink (processing multiple commands) using Bash Post 302857163 by MKANET on Wednesday 25th of September 2013 02:03:15 PM
Old 09-25-2013
Okay, I now understand how a simple here-document works. However, I'm still having trouble understanding why there is a EOP "here document" within a another EOF here-document; and, how it relates to the backtick in the script.

There is everything within:

Code:
<< EOF
$(
<< EOP

EOP
)
EOF

Code:
plink.exe -ssh -l UserID -pw Password01 192.168.1.2 << EOF
$(
  while read port
  do
    cat << EOP
    config t
    int $port
    shut
    no shut
    exit
EOP
  done < ports.txt
)
    exit
    exit
EOF

Sorry, I'm feeling really dense. I really appreciate all the help on this forum!

Quote:
Originally Posted by Corona688
More or less correct. It's called a "here-document", and attaches the text inside the block to the standard input of the program its fed into. It's a shell feature. It will work with any program that reads from standard input, not just cat.
 

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LEARN ABOUT CENTOS

bashbug

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)
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