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Sixth-Semester-BE-Degree-Examination-JuneJuly-2013-UNIX-System-Programming-->View question

Explain file handling in PERL.

Unix and shell programming


Asked On2017-06-07 08:18:34 by:Aparna-Dasgupta

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visharjun

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The opencloseprint and read commands will allow you to perform most common file operations. However, much more is possible. Apart from opening files you may open pipes to other commands using the | mode and read 

The open function opens a file for input (i.e. for reading). The first parameter is the filehandle which allows Perl to refer to the file in future. The second parameter is an expression denoting the filename. If the filename was given in quotes then it is taken literally without shell expansion. So the expression '~/notes/todolist' will not be interpreted successfully. If you want to force shell expansion then use angled brackets: that is, use <~/notes/todolist> instead.

The close function tells Perl to finish with that file.

There are a few useful points to add to this discussion on filehandling. First, the openstatement can also specify a file for output and for appending as well as for input. To do this, prefix the filename with a > for output and a >> for appending.



Answerd on:2017-06-28 Answerd By:13priya

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The opencloseprint and read commands will allow you to perform most common file operations. However, much more is possible. Apart from opening files you may open pipes to other commands using the | mode and read 

The open function opens a file for input (i.e. for reading). The first parameter is the filehandle which allows Perl to refer to the file in future. The second parameter is an expression denoting the filename. If the filename was given in quotes then it is taken literally without shell expansion. So the expression '~/notes/to do list' will not be interpreted successfully. If you want to force shell expansion then use angled brackets: that is, use <~/notes/to do list> instead.

The close function tells Perl to finish with that file.

There are a few useful points to add to this discussion on file handling. First, the open statement can also specify a file for output and for appending as well as for input. To do this, prefix the filename with a > for output and a >> for appending.


Answerd on:2019-09-09 Answerd By:Annaliya

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