Page 139 - DCAP106_OPERATING_SYSTEM_TOOLS

Operating System Tools

Notes z z ping: send ICMP ECHO_REQUEST to network hosts, you will get back ICMP packet if
the host responds. We use this command if there is a doubt whether the computer is
connected or not.

z z $ ping IP or host name.
z z hostname : This command is used to show or set the system’s host name.
z z dnsdomainname : This command is used to show the system’s DNS domain name.
z z netstat: This command displays the status of ports i.e. which ports are open, closed,
waiting for connections. It displays the contents of /proc/net file.

z z ifconfig: This command is used to configure a network interface, or to display their current
configuration. It is also useful to get the information regarding IP address, Subnet Mask,
set remote IP address, Netmask etc.
z z ifup : This command is used to bring a network interface up.
z z ifdown : This command is used to take a network interface down.

8.1.5 Achieve Commands

Let us suppose that you want to install a package from its source code. You observed that the
source code of the package is archived in a file xxx.tar. In this condition, the command-line
utility ‘tar’ proves to be a critical resource for you. The ‘tar’ is perhaps the most popular Linux
backup utility. If the ‘tar’ file is compressed with the compression utility like ‘bzip’ or ‘gzip’,
the resulting file is the famous ‘tarballs’ which is a common way to deliver software installation
archives.

tar: It is an archiving program which is designed to store and extract files from an archive known
as a tarfile.
Options:

-c : create a new archive
-r : append files to the end of an archive
-t : list the contents of an archive
-u : only append files that are newer than copy in archive
-x : extract files from an archive
-C : change to directory Dir

-j : filter archive through bzip2, use to decompress .bz2 files
-v : verbosely list files processed
-f : use archive file
-z : filter the archive through gzip

Examples:
tar -xvf test.tar (extract foo.tar to the current location)
tar -xvzf test.tar.gz (extract gzipped test.tar.gz)

tar -cvf test.tar foo/ (compress the contents of foo folder to foo.tar)

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