can someone explain the meaning of the following shell commands:
1. who / wc -l
2. who / sort > user_names
3. cat students > new_students
4. current_day='date / cut -cl-3'
i would also appreciated if you could tell me some things about the umask
1. what is a good umask value and why?
2.... (2 Replies)
What is the basic syntax for a script that says
do you want to do this?
y - execute this
n - end
not y or n - end and print this
for example if I want to run this:
"Do you want to start this process?"
answer
if y,Y, or yes
then
run the following script (do I put the script with... (10 Replies)
OK...I'm using the latest version of Fedora 10.
My network connection was working fine, and I had several network LAN shares on my desktop. Then I rebooted the system without dismounting those shares first. ooops. <:(
...When the system came back up, my network connection was gone. All... (2 Replies)
Hi all,
OS: fedora release 10
when i try to restart network service, ending up with following errors. There are two interfaces eth0 and eth1
bringing up interface eth0 rtnetlink answers file exists
error adding <IP Address here> to eth0
bringing up interface eth0 rtnetlink answers... (2 Replies)
hello guys!! need 1 favour from u all..
Can u jst tell me the answers for these ques??
1. ls - l _____ : command to return all files that end with single digit and those with TXT extension
2. ls -l report* _______ : command to return all files that start with the word RPT except those with LOG... (1 Reply)
Hello All,
While I am studying on RTNETLINK, I understand that the kernel will send RTM_ADDLINK or RTM_DELLINK if interface is added/removed at kernel space. However, I have a question regarding to the RTNETLINK message if adding or removing ethernet to/from bridge? Since adding or removing... (0 Replies)
Hi,
I have wrote a python program to sum the numbers in a list.However its giving answer one.
Please advise.
MyList =
Number = int(input("Please enter number:"))
for i in range(1, Number + 1):
value = int(input("Enter Numbers %d:" %i))
MyList.append(value)
total =... (3 Replies)
Discussion started by: nag_sathi
3 Replies
LEARN ABOUT PHP
netmasks
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)