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What is redirection?
Directing the flow of data to the file or from the file for input or output.Example : �ls > wc
satyam.kumar2008
- Aug 9th, 2008
Whenever we run a command on shell prompt we get some output on shell prompt.In case we don't want to appear the output on the shell prompt we can redirect the output to the somewhere else. We can mak...
wow_suraj
- May 7th, 2008
redirection is used to change the default input and output source.'>' is used to redirect the output to location other than standard output terminal. If the location doesn't exist it wi...
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How to terminate a process which is running and the specialty on command kill 0?
With the help of kill command we can terminate the process.Syntax: kill pidKill 0 - kills all processes in your system except the login shell.
satyam.kumar2008
- Aug 9th, 2008
Kill -0 : All processes in the current process group are signaled. Kill -0 commnd is use to sends signal to all process and group of process.
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What is a pipe and give an example?
A pipe is two or more commands separated by pipe char '|'. That tells the shell to arrange for the output of the preceding command to be passed as input to the following command. Example : ls -l | prThe output for a command ls is the standard input of pr. When a sequence of commands are combined using pipe, then it is called pipeline.
satyam.kumar2008
- Aug 9th, 2008
The Unix commands alone are powerful, but when two or more commands get combine together, we can accomplish complex task with ease.In unix we can combine the two or more commands together to perform m...
wow_suraj
- May 7th, 2008
Pipe '|' is used to combine two or more commands to be executed at the sameinstance.Pipe redirects output of the first command (before '|') as input to the second comman...
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Explain kill() and its possible return values?
There are four possible results from this call:�kill()� returns 0. This implies that a process exists with the given PID, and the system would allow you to send signals to it. It is system-dependent whether the process could be a zombie.�kill()� returns -1, �errno == ESRCH� either no process exists with the given PID, or security� enhancements are causing the system to deny its existence. (On���� some...
csbhaskar
- Mar 4th, 2011
As we all know kill command sends a signal to the kernel. This signals are of 64 types. To list all these signals you can use kill -l. Signal no 1 -31 can be invoked by user, whereas, signal no 34-64 ...
satyam.kumar2008
- Aug 9th, 2008
Kill is one of the command in UNIX/LINux which allow user to kill/terminate one process ID or multiple processes IDs.Syntax:$kill -[options] PID$kill -9 754425The kill command send the specified signal to the specified process or process group
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What is relative path and absolute path?
Absolute path : Exact path from root directory.Relative path �: Relative to the current path.
mmakoko
- Jul 25th, 2009
Absolute path: Exact path from root directory to the target directory.Relative path: Path for current directory to target directory.
shyam82
- Apr 21st, 2009
Relative path name is relative to current directory. Following notations are very heplful.1* denotes current directory2** denotes parent directoryAbsolute path name is full path name. Each directory a...
