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Top Forums Shell Programming and Scripting Adding user name to file, and then displaying new line number Post 302970698 by Don Cragun on Sunday 10th of April 2016 10:19:59 PM
Old 04-10-2016
Quote:
Originally Posted by hhdzhu
why it deletes all the contents of the file when I add" > file" after sort? "sort -k2 file > file".If the name already exist then we dont add it. how should we do?Thank you!
If you're saying that only want to add the given name to your file (without checking to see whether or not that name was already in the file, AND you don't need the line where it was added, the way to do that would be:
Code:
echo $name | sort -k2 - file -o file

and if you wanted to only add that name if it was not already in the file:
Code:
echo $name | sort -u -k2 - file -o file

When you use the command line:
Code:
sort -k2 file > file

the shell sees the redirection (> file) and creates a file named file (destroying any contents that may have existed in that file) and then starts the sort utility. The sort utility will then open the file named as a command-line argument (in this case also named file which, after the shell has redirected the output, is now an empty file).
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Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME
Graphics::Primitive::Insets - Space between things DESCRIPTION
Graphics::Primitive::Insets represents the amount of space that surrounds something. This object can be used to represent either padding or margins (in the CSS sense, one being inside the bounding box, the other being outside) SYNOPSIS
use Graphics::Primitive::Insets; my $insets = Graphics::Primitive::Insets->new({ top => 5, bottom => 5, left => 5, right => 5 }); METHODS
Constructor new Creates a new Graphics::Primitive::Insets. Instance Methods as_array Return these insets as an array in the form of top, right, bottom and left. bottom Set/Get the inset from the bottom. equal_to Determine if these Insets are equal to another. left Set/Get the inset from the left. right Set/Get the inset from the right. top Set/Get the inset from the top. zero Sets all the insets (top, left, bottom, right) to 0. AUTHOR
Cory Watson, "<gphat@cpan.org>" SEE ALSO
perl(1) COPYRIGHT &; LICENSE Copyright 2008-2010 by Cory G Watson. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2010-08-21 Graphics::Primitive::Insets(3pm)
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