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Full Discussion: Purpose of "read" and "$END$" in ksh ?
Top Forums Shell Programming and Scripting Purpose of "read" and "$END$" in ksh ? Post 302535661 by DGPickett on Friday 1st of July 2011 10:54:05 AM
Old 07-01-2011
read takes one line, unless you muck with env I suppose, and puts the first field in the first variable and so on with the rest in the last variable. Apparently the version is the 3rd field of the first line. The cat is lazy, read <file is cheaper than a fork, pipe, exec of cat.

<< is a converter of script lines to stdin, and stops on a line with the following token only. The script lines are expanded for variables and such, so I prefer echo '...'|, where single quotes keep things literal. << copies the processed lines to a temp file, so it is the cost of a temp file create versus a pipe, echo being a builtin.
Last edited by DGPickett; 07-01-2011 at 11:59 AM..
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LEARN ABOUT REDHAT

tcp-env

tcp-env(1)                                                    General Commands Manual                                                   tcp-env(1)

NAME

       tcp-env - set up TCP-related environment variables

SYNOPSIS

       tcp-env [ -rR ] [ -ttimeout ] program [ arg ...  ]

DESCRIPTION

       The  input  for  tcp-env  must be a TCP connection.  tcp-env finds out information about that connection, puts the information into several
       environment variables as described in tcp-environ(5), and runs program with the given arguments.

       Usually tcp-env is run from inetd.  It might instead be run from another server that already sets up the right  environment  variables;  if
       PROTO  is  set  to  TCP  when  tcp-env  is invoked, tcp-env assumes that all the other variables are set up properly, and it does not check
       whether the input is a TCP connection.

OPTIONS

       -r     (Default.)  Attempt to obtain TCPREMOTEINFO from the remote host.

       -R     Do not attempt to obtain TCPREMOTEINFO from the remote host.

       -ttimeout
              Give up on the TCPREMOTEINFO connection attempt after timeout seconds.  Default: 30.

SEE ALSO

       tcp-environ(5), inetd(8)

                                                                                                                                        tcp-env(1)
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