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Full Discussion: Delete some lines in a file
Top Forums UNIX for Advanced & Expert Users Delete some lines in a file Post 302440847 by ygemici on Wednesday 28th of July 2010 02:39:10 PM
Old 07-28-2010
Quote:
Originally Posted by ponmuthu
can u explain this cmd

sed -n "1,$(echo "`sed -n '$=' infile` - 3" |bc) p" infile

i can't understand whr we hav to give file name
# echo "`sed -n '$=' infile` - 3" |bc --->
sed -n '$=' infile ---> only print last line number ---> equal 8
and minus 3 eqaul 5
and sed -n "1,5p" --> only print 1 between 5 number line
 

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SC_ATTACH(1)						    BSD General Commands Manual 					      SC_ATTACH(1)

NAME
sc_attach -- simple scamper driver. SYNOPSIS
sc_attach [-?v] [-i infile] [-o outfile] [-p port] DESCRIPTION
The sc_attach utility provides the ability to connect to a running scamper(1) instance, have a set of commands defined in a file be executed, and the output be written into a single file, in warts format. The options are as follows: -? prints a list of command line options and a synopsis of each. -i infile specifies the name of the input file which consists of a sequence of scamper(1) commands, one per line. If '-' is specified, com- mands are read from stdin. -o outfile specifies the name of the output file to be written. The output file will use the warts format. If '-' is specified, output will be sent to stdout. -p port specifies the port on the local host where scamper(1) is accepting control socket connections. -v prints the current revision of sc_attach and exits. EXAMPLE
Given a set of commands in a file named infile.txt: tbit -M 1280 -u 'http://www.example.com/' 2620:0:2d0:200::10 trace -P udp-paris -M 192.0.2.1 ping -P icmp-echo 192.0.32.10 and a scamper(1) daemon listening on port 31337, then these commands can be executed using sc_attach -i infile.txt -o outfile.warts -p 31337 SEE ALSO
scamper(1), sc_wartsdump(1), sc_warts2text(1) AUTHORS
sc_attach is written by Matthew Luckie <mjl@luckie.org.nz>. BSD
October 15, 2010 BSD
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