Port num incrementing Post: 302200115

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Top Forums Shell Programming and Scripting Port num incrementing Post 302200115 by aigles on Wednesday 28th of May 2008 12:40:41 PM

05-28-2008

Registered User

Try and adapt the following script (demo.sh) :

Code:

default_port_file=.default_port
default_port_value=56

get_default_port() {
   if [ -f $default_port_file ]
   then
      default_port=$(<$default_port_file)
   else
      default_port=$default_port_value
   fi
}

set_default_port() {
   if [[ $1 > ${default_port:-$default_port_value} ]]
   then
      echo $1 > $default_port_file
   fi
}

demo()
{
   get_default_port
   echo "Enter port number [$default_port]:"
   read port

   port=${port:-$default_port}
   echo "Port number = $port"
   echo

   set_default_port $((port+1))
}

until [[ "${ans:-y}" != "y" ]]
do
   demo
   echo "do u want re-run it (y/n) [y]:"
   read ans
done
exit

The default port value is memorized is the file .default_port.
When a port number is set, the new default port value is set to this value plus 1 (if greater than actual default value).

Code:

$ ls .default_port
/bin/ls: cannot access .default_port: No such file or directory
$ demo.sh
Enter port number [56]:

Port number = 56

do u want re-run it (y/n) [y]:
y
Enter port number [57]:
12
Port number = 12

do u want re-run it (y/n) [y]:
y
Enter port number [57]:
68
Port number = 68

do u want re-run it (y/n) [y]:
y
Enter port number [69]:

Port number = 69

do u want re-run it (y/n) [y]:
n
$ cat .default_port
70
$ demo.sh
Enter port number [70]:

Port number = 70

do u want re-run it (y/n) [y]:
n
$

Jean-Pierre.

aigles

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gchem3d

GCHEM3D(1)						       gnome-chemistry-utils							GCHEM3D(1)

NAME

       gchem3d - a small chemical viewer application

SYNOPSIS

       gchem3d [OPTION(S)...] [FILE...]

DESCRIPTION

       gchem3d is a small chemical viewer application, which can show several chemical file formats.

OPTIONS

       The following options are accepted:

       -b COLOR, --bgcolor=COLOR
	   Use the given color as background color.  COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#"
	   character in the shell).

       -d MODEL, --display3d=MODEL
	   Choose how molecules are displayed.	MODEL can be one of "BallnStick" (default), "SpaceFill".

       -?, --help
	   Show application help options.

       --help-all, --help-*
	   Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7).

       -v, --version
	   Print gchem3d version information.

SEE ALSO

       gnome-options(7), gtk-options(7)

AUTHORS

       Jean Brefort <jean.brefort@normalesup.org>
	   Program author.

       Daniel Leidert <daniel.leidert@wgdd.de>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2002-2007 Jean Brefort
       Copyright (C) 2004-2007 Daniel Leidert

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any
       later version published by the Free Software Foundation.

gcu 0.12				      $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $					GCHEM3D(1)