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Add a line after last matched expression
Post 302691065 by Don Cragun on Thursday 23rd of August 2012 08:33:12 PM
08-23-2012
Quote:
Is ed - intended to be ed -s?
I'm not sure if "After the last line that begins with ACL localnet" means that there is only one match and that it occurs on the last line of the file, or if it means that there may be multiple matches. If the latter, I would suggest moving to line 1 before beginning the backwards search. As it is, if the final match is the last line, and if there is an earlier match, the earlier match will "win".
Regards,
Alister
I'm not sure if "After the last line that begins with ACL localnet" means that there is only one match and that it occurs on the last line of the file, or if it means that there may be multiple matches. If the latter, I would suggest moving to line 1 before beginning the backwards search. As it is, if the final match is the last line, and if there is an earlier match, the earlier match will "win".
Regards,
Alister
The POSIX standard says that a "-" operand produces unspecified results. On some systems, "-" is a synonym for "-s"; on other systems "-" is a file operand referring to ed's standard input. On OS X (the OS on my primary machine), "-" and "-s" are synonyms so I didn't notice the typo when I was testing.
You are also correct in noting that the current line is set to the last line in the buffer when a file is loaded into the buffer by the e command, the E command, or by naming a file operand on the command line.
Note that the following script could just use the command 1 (digit one; not letter el), but that would print the first line. Substituting the start of line 1 to nothing doesn't change anything on the line, but changes the current line to the 1st line in the buffer without printing anything.
Code:
#!/bin/ksh ed - in.addafter <<EOF 1s/^// ?^ACL localnet?a My Network 192.168.1.1 . w q EOF
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT DEBIAN
tgn
TGN(1) TGN(1) NAME
tgn - a network traffic generator SYNOPSIS
tgn [-V] [-v] [-l] [-s random seed] [-w PCAP filename] [-o output speaker] [-c packet count] [-h] [PDU definition] DESCRIPTION
tgn is a network traffic generator. It is command-line interface (CLI) program that does the same thing as the send_network command of the Network Expect framework. Refer to nexp(1) for additional details regarding the send_network command. The only mandatory option is a PDU definition. The -c switch allows to specify the number of packets to send. If -c is not provided then the number of packets to send is calculated automatically based on the PDU definition. -V causes tgn to print its version number and exit. The -s flag allows to specify a random seed that will cause predicatibility of pseudo-random numbers generated by tgn during execution of a script. In cases where tgn is used as a protocol fuzzer, this option is useful to be able to re-generate a specific test case. -v increases the verbosity level. Additional information may be displayed when the verbosity level is higher. The -l flag causes tgn to display all available network speakers and exit. See nexp(1) for a discussion of network speakers. The -o flag allows to select a specific network speaker for output. Use the -l option to list available speakers. By default, the "ip" speaker (kernel-routed IP packet delivery) is tried first and if it is not available, which can happen if tgn is not run with root privileges, the "hex" speaker is used. The PDU definition is a string that defines a PDU. It uses libpbuild PDU syntax. EXAMPLES
shell# tgn -o eth0 "ip(dst = 192.168.1.1)/icmp-echo(id = 'random')" shell# tgn "ip(src = 192.168.0.1, dst = <192.168.0.10, 192.168.0.11>,ttl = <1, 2>)/" "tcp(src = 'random', dst = 22..25, window = 16384,syn, seq = 'random', ack-seq = 0)" shell# tgn -w /tmp/cap -c 5 "ether()/ip(dst = 1.2.3.4++)/icmp-echo(seq = 0++)" && wireshark /tmp/cap BUGS
tgn has not been ported to Microsoft Windows. VERSION
This man page is correct for version 1.0 of tgn. SEE ALSO
nexp-numspec(1), nexp-payload(1), nexp-ether(5), nexp-gre(5), nexp-ip(5), nexp-mpls(5), nexp(1) AUTHOR
Network Expect was written by Eloy Paris <peloy@netexpect.org>. However, Network Expect borrows ideas from lots of Open Source tools like Nemesis, Packit, hping, Expect, and Scapy. The Network Expect author is indebted to the authors of these tools for their contribution. This man page was written by Eloy Paris. 09 September 2009 TGN(1)