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Unix
Unix is a family of operating systems primarily designed for servers, mainframes, and high-end workstations. First created in 1969, Unix systems are renowned for their security and stability.
1,127 Questions
What is Zombie Process and Orphan Process?
Zombie : Child Process Exits before Parent process and Parent does not grab status of child process using wait() or waitpid() system call; Child process is in Zombie state.
Orphan : Child process whose parent has been killed and inherited by init process.
UNIX may be described as being difficult to use Why?
Traditionally, the UNIX command interface was the only way to communicate within a UNIX system. Today, that is not true, with the graphical interfaces that are available. However, the true power of what you can do within UNIX is still in the command line interface.
The command line interface is not very intuitive, and uses commands that are abbreviated to the point of not necessarily being understandable. Also, system administration tasks in Unix have typically been harder to accomplish because of the amount of background knowledge necessary even to do simple things.
UNIX was developed early on for programmers by programmers, and little thought was given to the end user; as a result, it had a reputation of being difficult to use until you took the time to understand the (admittedly) arcane command line interface.
How does user know where he is in the file system in unix operating system?
Most people set up their shell to give them an indication in the command prompt. But this isn't "built in" (the mechanism for doing so is built in to most shells, but you can use the same mechanism to change the prompt to pretty much anything you want).
The command pwd on a Unix system should tell you "where you are".
What is the purpose of solaris jobs?
The purpose of Solaris jobs is to help program and support the operating system Solaris. There are a number of jobs within the company including programming jobs and administrative.
Yes, absolutely Android is user friendly. I have owned both iphone and androids and personally I will never go back to iphone. With iphone you have to pay for any decent app, with android you get trials for most paid apps to see if you like it, and there is TONS of absolutely free apps. If you want to load your device with mp3 music or videos, just hook it up to any computer, anywhere. There are tons of apps for android to download music, videos, totally free. The layout of android is totally user friendly as well, everything is easy to find, you can create, move, modify app storage and widgets on any of the 7 screens. I personally love my android and would simply never give it up.
2. Yes, Android is user friendly, but it really depends on the user.
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What is the command to return all files that start with word report except those with log extension?
find . name \*word report\!.log
Which UNIX system directory contains configuration files such as the passwd file?
Configuration files are typically stored in the /etc directory. They can, of course, be anywhere the implementer wishes them to be as long as the process knows where to find them.
Is this UNIX system is multiprocessing system?
no
Actually, it is. Unix has multi-processing and multi-tasking capabilities.
What do you mean by sleep and wakeup in unix?
sleep is a unix command line program that suspends program execution for specified period of time..
syntax:- sleep time
example:- sleep 10
date, time and wait are the related commands of sleep command...
What does the block size signifies in unix?
The block size specifies the minimum amount of space that will be used when writing disk blocks. The example, if you write 300 bytes of information to the disk and your block size for the file system is 512 bytes, then 512 bytes (a block) will be written to the disk. The first 300 bytes will be used and the rest to fill out the block of 512 bytes will not be used.
This allows for efficient space utilization (assuming the block size is reasonable) and for retrieval of information from the storage device.
Is Linux a robust operating system that is good training tool for unix?
No, Linux IS Unix, so the question makes no sense. Unix is a general term for a class of operating systems. Linux is also a term applied to more than one operating system variant, but all Linux OS are Unix OS. Redhat is one type of Linux. BSD is a type of Unix that is not Linux.
What is sem post and sem wait functions?
The sem_wait() function locks the semaphore referenced by sem by performing a semaphore lock operation on that semaphore. If the semaphore value is currently zero, then the calling thread will not return from the call to sem_wait()until it either locks the semaphore or the call is interrupted by a signal.
Upon successful return, the state of the semaphore is locked and remains locked until the sem_post() function is executed and returns successfully. The sem_wait() function is interruptible by the delivery of a signal.
The sem_post() function unlocks the semaphore referenced by sem by performing a semaphore unlock operation on that semaphore.
If the semaphore value resulting from this operation is positive, then no threads were blocked waiting for the semaphore to become unlocked; the semaphore value is simply incremented.
If the value of the semaphore resulting from this operation is zero, then one of the threads blocked waiting for the semaphore will be allowed to return successfully from its call to sem_wait(). If the symbol _POSIX_PRIORITY_SCHEDULING is defined, the thread to be unblocked will be chosen in a manner appropriate to the scheduling policies and parameters in effect for the blocked threads. In the case of the schedulers SCHED_FIFO and SCHED_RR, the highest priority waiting thread will be unblocked, and if there is more than one highest priority thread blocked waiting for the semaphore, then the highest priority thread that has been waiting the longest will be unblocked. If the symbol _POSIX_PRIORITY_SCHEDULING is not defined, the choice of a thread to unblock is unspecified.
The sem_post() interface is reentrant with respect to signals and may be invoked from a signal-catching function.
How many modes of operation does vi editor have?
At least three modes : input mode, command mode, and 'ex' mode.
How do you restore the deleted file from unix machine Sun Solaris?
Since there is no undelete or "trash" in Solaris (unless you are using a GUI interface) you have to restore it from a backup media.
How to exit vi editor in Linux?
Follow either of the following sequences:
Either press the ESC key, then ZZ,
or
press the ESC key, then type :wq
What are the common shell variables in unix?
The common shell variables differ according to which shell you are talking about. In general, they control the shell environment behavior, terminal behavior, and other external things.
You can get a list per shell by using the 'man' command with the shell name to list out the common variables used in that shell environment.
What is the metacharacter for command termination?
The metacharacter for command termination in Linux is semicolon ; .
What does the deinking process do?
This technology uses air bubbles to literally "float" detached ink particles to the top of a mixture of ground up paper and water, where the inky froth is skimmed
Change to the dev directory next access home directory using a tilde in the command that you employ?
CD dev
CD ~
What are the capabilities of apple McIntosh is it more advantage than Linux and UNIX?
First off, Macs are computers, whereas Linux/UNIX are operating systems. They are not the same.
Comparing OS X, however, is more productive: OS X itself is a UNIX operating system derived from BSD. Objectively, however, OS X falls quite short of the average UNIX implementation or Linux distribution in this category.
It allegedly sports the most "user friendly" interface, but this is subjective.
How do you write functions in Linux shell scripting?
It can depend on which shell environment you are using, but what I use is:
function something
{
# body of routine
}
# call the function
something
A shell program is a program that runs from the computer's command line. Although they were more common in older programs, some people still use them, as the are generally faster and and more minimalist than their graphical counterparts.
