12-04-2014
How to read file, and replace certain string with another string?
Hi all, the value in the following file is just an example. It could be a different value/network addresses.
Here is my example of initial output in a file name net.txt
Initial Output, net.txt
Quote:
10.0.0.0/8
172.16.1.0/16
192.168.1.0/24
The goal is to produce the following format which is to convert from CIDR to Netmask formatting.
Quote:
10.0.0.0 255.0.0.0
172.16.1.0 255.255.0.0
192.168.1.0 255.255.255.0
My current draft script which is not perfect is to use “sed” to replace “/24” with “255.255.255.0” format. This is part of network subnetting conversion.
This is to print the initial net.txt value and save the final output to net-mask.txt
Quote:
#!/bin/bash
awk '{
print "$1;
}' net.txt > net-mask.txt
Quote:
sed 's/\/8/ 255.0.0.0/'
sed 's/\/16/ 255.255.0.0/'
sed 's/\/24/ 255.255.255.0/'
or
Quote:
sed 's#/8# 255.0.0.0#'
sed 's#/16# 255.255.0.0#'
sed 's#/24# 255.255.255.0#'
Or course the sed script for CIDR to netmask table above is not complete. The full list of the conversion can be found here.
Netmask / CIDR Translation Table
Please let me know where is the best place to put “sed” into my shell script file.
If there is better way to do this, please let me know. Thanks in advance.
Last edited by type8code0; 12-05-2014 at 12:05 AM..
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netmasks(4) File Formats netmasks(4)
NAME
netmasks - network mask database
SYNOPSIS
/etc/inet/netmasks
/etc/netmasks
DESCRIPTION
The netmasks file contains network masks used to implement IP subnetting. It supports both standard subnetting as specified in RFC-950 and
variable length subnetting as specified in RFC-1519. When using standard subnetting there should be a single line for each network that is
subnetted in this file with the network number, any number of SPACE or TAB characters, and the network mask to use on that network. Network
numbers and masks may be specified in the conventional IP `.' (dot) notation (like IP host addresses, but with zeroes for the host part).
For example,
128.32.0.0 255.255.255.0
can be used to specify that the Class B network 128.32.0.0 should have eight bits of subnet field and eight bits of host field, in addition
to the standard sixteen bits in the network field.
When using variable length subnetting, the format is identical. However, there should be a line for each subnet with the first field being
the subnet and the second field being the netmask that applies to that subnet. The users of the database, such as ifconfig(1M), perform a
lookup to find the longest possible matching mask. It is possible to combine the RFC-950 and RFC-1519 form of subnet masks in the net-
masks file. For example,
128.32.0.0 255.255.255.0
128.32.27.0 255.255.255.240
128.32.27.16 255.255.255.240
128.32.27.32 255.255.255.240
128.32.27.48 255.255.255.240
128.32.27.64 255.255.255.240
128.32.27.80 255.255.255.240
128.32.27.96 255.255.255.240
128.32.27.112 255.255.255.240
128.32.27.128 255.255.255.240
128.32.27.144 255.255.255.240
128.32.27.160 255.255.255.240
128.32.27.176 255.255.255.240
128.32.27.192 255.255.255.240
128.32.27.208 255.255.255.240
128.32.27.224 255.255.255.240
128.32.27.240 255.255.255.240
128.32.64.0 255.255.255.192
can be used to specify different netmasks in different parts of the 128.32.0.0 Class B network number. Addresses 128.32.27.0 through
128.32.27.255 have a subnet mask with 28 bits in the combined network and subnet fields (often referred to as the subnet field) and 4 bits
in the host field. Furthermore, addresses 128.32.64.0 through 128.32.64.63 have a 26 bits in the subnet field. Finally, all other
addresses in the range 128.32.0.0 through 128.32.255.255 have a 24 bit subnet field.
Invalid entries are ignored.
SEE ALSO
ifconfig(1M), inet(7P)
Postel, Jon, and Mogul, Jeff, Internet Standard Subnetting Procedure, RFC 950, Network Information Center, SRI International, Menlo Park,
Calif., August 1985.
V. Fuller, T. Li, J. Yu, K. Varadhan, Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy, RFC 1519,
Network Information Center, SRI International, Menlo Park, Calif., September 1993.
T. Pummill, B. Manning, Variable Length Subnet Table For IPv4, RFC 1878, Network Information Center, SRI International, Menlo Park, Calif.,
December 1995.
NOTES
/etc/inet/netmasks is the official SVr4 name of the netmasks file. The symbolic link /etc/netmasks exists for BSD compatibility.
SunOS 5.10 7 Jan 1997 netmasks(4)