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Full Discussion: Bash: How to use read with conditions & loops
Top Forums Shell Programming and Scripting Bash: How to use read with conditions & loops Post 302983550 by Chubler_XL on Wednesday 12th of October 2016 10:48:05 PM
Old 10-12-2016
You could write a function to prompt for and set your IP address like this:

Code:
#!/bin/bash
fetchip() {

    printf "%s: " "$1"
    read
    while ! [[ "$REPLY" =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; do
      printf "Invalid $1 IP address - Please re-enter\n%s: " "$1"
      read
    done

    printf -v $1 "%s" "$REPLY"
}

fetchip network
fetchip netmask
fetchip broadcast
fetchip gateway

echo "-----------------"
echo "Network=$network"
echo "Netmask=$netmask"
echo "Broadcase=$broadcast"
echo "gateway=$gateway"

This User Gave Thanks to Chubler_XL For This Post:
Arnaudh78
 

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LEARN ABOUT DEBIAN

ost_networkdeviceinfo

ost::NetworkDeviceInfo(3)				     Library Functions Manual					 ost::NetworkDeviceInfo(3)

NAME

       ost::NetworkDeviceInfo -

       Network device information class.

SYNOPSIS

       #include <network.h>

   Public Member Functions
       NetworkDeviceInfo (const NetworkDeviceInfo &ndi)
       ~NetworkDeviceInfo ()
       const String & name () const
	   Returns the Name of the network device.
       const InetHostAddress & address () const
	   Returns the Address of the network device.
       const BroadcastAddress & broadcast () const
	   Returns the Broadcast address of the network device.
       const InetMaskAddress & netmask () const
	   Returns the Netmask of the network device.
       const int mtu () const
	   Returns the MTU.

   Protected Member Functions
       NetworkDeviceInfo (const String &name, const InetHostAddress &addr, const BroadcastAddress &broadcast, const InetMaskAddress &netmask, int
	   mtu)

   Friends
       __EXPORT bool enumNetworkDevices (std::vector< NetworkDeviceInfo > &devs)
	   Enumerate all available network devices.

Detailed Description
       Network device information class.

       This class is used to hold various informations about a TCP/IP network device. Which can be obtained by a call to enumNetworkDevices()

       Author:
	   Christian Prochnow cproch@seculogix.de

Constructor &; Destructor Documentation
   ost::NetworkDeviceInfo::NetworkDeviceInfo (const String &name, const InetHostAddress &addr, const BroadcastAddress &broadcast, const
       InetMaskAddress &netmask, intmtu) [protected]
   ost::NetworkDeviceInfo::NetworkDeviceInfo (const NetworkDeviceInfo &ndi)
   ost::NetworkDeviceInfo::~NetworkDeviceInfo ()
Member Function Documentation
   const InetHostAddress& ost::NetworkDeviceInfo::address () const [inline]
       Returns the Address of the network device.

   const BroadcastAddress& ost::NetworkDeviceInfo::broadcast () const [inline]
       Returns the Broadcast address of the network device.

   const int ost::NetworkDeviceInfo::mtu () const [inline]
       Returns the MTU.

   const String& ost::NetworkDeviceInfo::name () const [inline]
       Returns the Name of the network device.

   const InetMaskAddress& ost::NetworkDeviceInfo::netmask () const [inline]
       Returns the Netmask of the network device.

Friends And Related Function Documentation
   __EXPORT bool enumNetworkDevices (std::vector< NetworkDeviceInfo > &devs) [friend]
       Enumerate all available network devices.

Author
       Generated automatically by Doxygen for GNU CommonC++ from the source code.

GNU CommonC++							  Sat Jun 23 2012					 ost::NetworkDeviceInfo(3)
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