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Aaj Ka Command
"One Day One Gnu/Linux Command"
Get information on random commands in Gnu/Linux
This Feature is maintained by Bharathi Subramanian
The full archive is maintined here
http://www.livejournal.com/community/ilugc/





halt -- Stop the System. Print E-mail
Prof. Douglas Comer, author of the Network & OS Books and Creator
of Xinu OS. URL: http://www.cs.purdue.edu/people/comer

One Day One Command
===================

halt -- Stop the System.

Summary:

Halt notes that the system is being brought down in the /var/log/wtmp,
file and then either tells the kernel to halt, reboot or poweroff the
system. Halt invoke shutdown, if the system is not in runlevel 0 or 6.

Read more...
host -- DNS Look-up Utility Print E-mail
Prof Andrew S. Tanenbaum (AST) Author of many OS and Network Books
and Creator of Minix & Amoeba OS. URL: http://www.cs.vu.nl/~ast/

One Day One Command
===================

host -- DNS Look-up Utility

Summary:

host is a simple utility for performing DNS (Domain Name Service)
lookups.  It is normally used to convert names to IP addresses and
vice versa.

Read more...
hdparm -- Get/Set Hard Disk Parameters. Print E-mail
Richard W Stevens author of UNIX Networking Programming and
TCP/IP Illustrated Book series. URL: http://www.kohala.com/

One Day One Command
===================

hdparm -- Get/Set Hard Disk Parameters.

Summary:

hdparm provides a command line interface to various hard disk ioctls
supported by the stock Linux ATA/IDE device driver subsystem.

You *MUST* read the man page completely, if you want to do anything
else, apart from this examples.
Read more...
lsof -- LiSt Open Files. Print E-mail
Edsger Wybe Dijkstra (EWD) was one of the most influential members of
computing science's founding generation and he honored by ACM Turing
Award. URL: http://www.cs.utexas.edu/users/EWD/

One Day One Command
===================

lsof -- LiSt Open Files.

Summary:

lsof lists all open files belonging to all active processes. An open
file may be a regular file, a Dir, a special file, an executing text
reference, a library, a stream or a network file (Internet socket, NFS
file or UNIX domain socket).          
Read more...
strace -- Trace System Calls and Signals Print E-mail
RMS (Richard M Stallman) Founder of GNU Projects and Free Software
Foundation (FSF). URL: http://www.stallman.org/

One Day One Command
===================

strace -- Trace System Calls and Signals.

Summary:

In the simplest case strace runs the specified command until it exits.
It intercepts and records the system calls which are called by a
process and the signals which are received by a process.  The name of
each system call, its arguments and its return value are printed.
strace is a useful diagnostic, instructional, and debugging tool.



Read more...
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