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Full Discussion: Validate an IP address - Return to menu
Top Forums Shell Programming and Scripting Validate an IP address - Return to menu Post 302377407 by Scrutinizer on Friday 4th of December 2009 02:56:30 AM
Old 12-04-2009
OK I brushed it up a little bit so that is handles ".1.1.1" :
Code:
#!/bin/sh
set -x
oldIFS=$IFS
while : ; do
  IFS=$oldIFS
  echo "Enter IP address"
  read quad

  IFS=.
  set -- $quad

  if [ $# -ne 4 ]; then
    echo "Must have 4 parts"
    continue
  fi

  for oct in $1 $2 $3 $4; do
    echo $oct | egrep "^[0-9]+$" >/dev/null 2>&1
    if [ "$?" -ne "0" ]; then
       echo "$oct: Not numeric"
       continue 2
    else
       if [ "$oct" -lt "0" -o "$oct" -gt "255" ]; then
          echo "$oct: Out of range"
          continue 2
       fi
    fi
  done

  echo "$quad" | grep "\.$" >/dev/null 2>&1
  if [ "$?" -eq "0" ]; then
    echo "Trailing period - invalid"
    continue
  fi

  if [ -n $1 ] || [ $1 -eq 0 ]
  then
    echo "First octet must not be zero (0)..."
    continue
  fi

  # if we're here, we're validated
  echo "$quad validates OK!"
  exit 0
done

Not my cup of tea though. Check CFA Johnson's solution:
Last edited by Scrutinizer; 12-04-2009 at 04:02 AM..
 

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LEARN ABOUT DEBIAN

install-menu

install-menu(1) 					      Debian GNU/Linux manual						   install-menu(1)

NAME

       install-menu - Process a menu method and generate the menu files for a window manager or a menu-aware application.

DESCRIPTION

       update-menus(1) computes the list of menu entries and passes it in turn to the menu methods in /etc/menu-methods/. The task of a menu meth-
       ods is to generate menus for a specific window manager.	install-menu provides a generic and customizable way to do that. The documentation
       of the install-menu definition language is available in the Debian Menu manual, a local copy being available in /usr/share/doc/menu/html.

SYNOPSIS

       install-menu [-vh] [--remove] <menu-method>

       Read menu entries from stdin in update-menus --stdout format and generate menu files using the specified menu-method.

       Normally used in menu method scripts as #! /usr/bin/install-menu.

OPTIONS

       -h,--help
	      Show the help message and exit.

       --remove
	      Remove the menu files instead of generating them.

       -v,--verbose
	      Output messages about what the program is doing.

COPYING

       install-menu is distributed under the term of the GNU General Public License version 2, or (at your option) any later version.

AUTHOR

       Written by Joost Witteveen <joostje@debian.org>.  Now maintained by Bill Allombert <ballombe@debian.org>.

SEE ALSO

       update-menus(1), menufile(5), /usr/share/doc/menu/html

Debian Project							 28 November 2005						   install-menu(1)
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