The UNIX operating system was developed at AT&T Bell Laboratories in Murray Hill, New Jersey in the late 1960's.Its major version is AT&T's UNIX System V.
It is having four basic components: 1) The kernel constitutes the nucleus of the operating system and coordinates the internals such as allocating system resources. 2) The file system, which is part of the kernel, controls the storage and access of data. It is similar to the VMS file system in that the structure is hierarchical. 3) Commands are programs that you request the computer to execute. 4) Programs (commands) called shells serve as command interpreters. They act as links between the user and the computer, interpreting and executing commands. They are also high-level interpretive programming languages.
Advantages of Unix: 1) Full multitasking with protected memory. Multiple users can run multiple programs at the same time without interfering each other. 2) It is having Very efficient virtual memory, so many programs can run with a modest amount of physical memory. 3) It is secure and can access controls.All users must be authenticated by a valid account and password to use the system at all. All files are owned by particular accounts. The owner can decide whether others have read or write access to his files. 4) It provides the ability to string commands and utilities together in unlimited ways to accomplish more complicated tasks. 5) It is portable. 6) It is optimized for program development, and thus for the unusual circumstances that are the rule in research. 7) Unix is extremely powerful. User can customize their own shell easily, and can do pipes, shell scipts etc.
Disadvantages of Unix:
1) The traditional command line shell interface is user hostile designed for the programmer, not the casual user. 2) Commands often have cryptic names and give very little response to tell the user what they are doing. 3) There is a need to understand some of the main designs to use Unix well. 4) It makes the beginner confuse.
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UNIX Dear Sir,
Kindly send some important points/notes in UNIX since I have taken the exam pertains to UNIX, so that it will be very helpful...,
The UNIX operating system was developed at AT&T Bell Laboratories
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Connecting to Unix through Java Could you please tell a sample code, where i connect to the unix server and run a script and write the results in a file and mail that file back to me
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Unix Web Hosting is the type hosting provided on the
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in unix which command is used to create files
in unix which command is used to create files in unix which command is used to create files
The cat command in UNIX can be used to create and display information from a file.
Command to create a file
% cat >
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PHP microtime() Function
microtime() returns the current Unix timestamp with microseconds. microtime function is only available on operating systems...;microsec sec", where sec is the number of seconds since the Unix Epoch (0
date_timsestamp_set alias DateTime::setTimestamp function is used for setting the date and time based on an Unix timestamp.
unixtimestamp - Unix timestamp representing the date.
date_timestamp_get alias DateTime::getTimestamp function is used for getting the Unix timestamp.
public int DateTime....
Returns Unix timestamp representing the date
containing the date information of Unix timestamp, or the current local time. ... is an integer Unix timestamp that defaults to the current local time if a timestamp... since the Unix Epoch, similar to the values returned by time() and used by date
PHP mktime() Function
The mktime() returns the Unix timestamp for a date that contains the number of seconds between the Unix Epoch (January 1 1970 00:00:00 GMT) and the time specified. The arguments may be left out in order from right
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PHP strtotime() Function
The strtotime() parses a US English textual date or time into a Unix timestamp (the number of seconds since January 1 1970 00:00:00 GMT). This function use the TZ environment variable (if available) to calculate
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