a very basic sed one-liner...that isn't working :-(
Greetings all.
I would like to use sed to join all non-blank lines together in a particular file. I was thinking I could do this by simply replacing the terminating, new-line character on every line which is not blank, but I must be missing something in my sed line:
Code:
$ sed '/^.*$/s/\n$/\t/' InputFile
The solution here needs to leave blank lines untouched as the file is setup so blank lines mark the beginning of a new block of related lines, like so:
Code:
ROUTER-1-1
Virtual-Access1 is up, line protocol is up
Hardware is Virtual Access interface
MTU 1500 bytes, BW 256 Kbit, DLY 20000 usec,
reliability 255/255, txload 5/255, rxload 4/255
Encapsulation PPP, LCP Open
Dialer0 is up, line protocol is up (spoofing)
Hardware is Unknown
Internet address is 192.168.1.1/32
MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
Virtual-Access1 is up, line protocol is up
Hardware is Virtual Access interface
MTU 1500 bytes, BW 256 Kbit, DLY 20000 usec,
reliability 255/255, txload 5/255, rxload 4/255
Encapsulation PPP, LCP Open
Loopback0 is up, line protocol is up
Hardware is Loopback
Description: Version 1.2
Internet address is 10.0.1.1/32
MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation LOOPBACK, loopback not set
Essentially, each original line in a block will end-up as a tab-delimited field on a single line of output; Something like this:
Code:
ROUTER-1-1 Virtual-Access1 is up, line protocol is up Hardware is Virtual Access interface MTU 1500 bytes, BW 256 Kbit, DLY 20000 usec, reliability \ ...
Dialer0 is up, line protocol is up (spoofing) Hardware is Unknown Internet address is 192.168.1.1/32 MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, \ ...
Virtual-Access1 is up, line protocol is up Hardware is Virtual Access interface MTU 1500 bytes, BW 256 Kbit, DLY 20000 usec, reliability \ ...
Loopback0 is up, line protocol is up Hardware is Loopback Description: Version 1.2 Internet address is 10.0.1.1/32 MTU 1514 bytes, BW 8000000 \ ...
Please correct my misguided ways and also let me know if you have a more eligant solution to this problem.
Thanks!
--Steve
(Linux newbie...in case you couldn't tell)
p.s.
For anyone out there reading this on a small monitor, I'm sorry if my lines of example output are excessively long.
I thought about using shorter (...and more boring) lines of input, but in the end, thought it might be more interesting and instructive if I included the real-world data with which I'm working.
If I made the wrong call here, let me know and I'll refrain from including long lines in my future posts.
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LEARN ABOUT X11R4
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)
10-08-2009
