Command Line

strace — Trace System Calls and Signals

by
RMS (Richard M Stallman) Founder of GNU Projects and Free Software
Foundation (FSF). URL: http://www.stallman.org/

One Day One Command
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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.

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dd — Convert and Copy Files

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The Free Software Foundations are proud to announce the creation of
the global “GPL Version 3 Development and Publicity Project”. This
activity is supported by no. of organizations.
URL: http://www.gnu.org/

One Day One Command
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dd — Convert and copy a file.

Summary:

‘dd’ copies and optionally converts data with changeable I/O block
size. Reads are issued to the input file or device for the size of
the input buffer and writes are issued for the size of the output
buffer. This allows I/O requests to be tailored to the requirements of
a task. Output to standard error reports the number of full and short
blocks read and written.

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Crontab Tutorial

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Crontab Tutorial * What is a Crontab? A cron is a utility that allows tasks to automatically run in the background at regular intervals by use of the cron daemon. Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at what times they are to be run.This … Read more