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UNIX for Beginners Questions & Answers
Question about WCHAN values
Post 303044501 by nezabudka on Monday 24th of February 2020 11:55:42 AM
02-24-2020
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Hello,
Do you have any idea why the below sed command is also replacing the value of "PARAMETER2" instead of just "PARAMETER" in file1 ?
% parameter=PARAMETER
% new_value=2
% cat file1
PARAMETER=1
PARAMETER2=1
% cat file1 | sed s/*$/${new_value}/1
PARAMETER=2
PARAMETER2=2
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LEARN ABOUT DEBIAN
pcapdump
pcapdump(1) pcapdump(1) NAME
pcapdump - dedicated packet capture utility SYNOPSIS
pcapdump [OPTIONS]... DESCRIPTION
pcapdump captures packets from a network interface and writes them to a dumpfile. The filename argument given to -w will be formated by strftime(3). PCAPNET OPTIONS
-i interface Input interface to read packets from. -r pcap file Dump file to read packets from. -w pcap file Dump file to write filtered packets to. -f expression BPF expression which selects packets to be filtered. -s snaplen Capture snaplen bytes of data from each packet. -p Disable promiscuous mode sniffing. PROGRAM OPTIONS
-u owner Set the output file's owning user to owner. -g group Set the output file's owning group to group. -m mode Set the output file's mode to mode, specified in octal. -t secs Dump file rotation interval in seconds. -c count Exit after capturing count packets. -T secs Exit after capturing during this amount of seconds. -H Only capture link, network, and transport headers; do not capture application-layer data. -S sample value Sample the packet stream by only dumping 1 in every sample value packets. -R Together with -S, sample the packets randomly, not systematically. -P pidfile Daemonize the process and write its PID to pidfile. -C config file File to read configuration variables from. Instead of passing configuration through the command line, a file can be used to specify values for the bpf, device, filefmt, group, interval, mode, owner, promisc, and snaplen options (not all need to be specified; de- faults will be used otherwise). See /usr/share/doc/pcaputils/examples/pcapdump/eth0 for an example. 9 May 2009 pcapdump(1)