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Full Discussion: delete line in a file
Top Forums Shell Programming and Scripting delete line in a file Post 71913 by dta4316 on Tuesday 17th of May 2005 04:13:43 AM
Old 05-17-2005
delete line in a file

Hi all,
I would like to delete a line in file.txt which has a list of filename.
example:
file_a
file_b
file_c

lets say i have file_b in my directory, then i should delete file_b in file.txt and get output file.txt with only file_a and file_b.

Below is my script, my result is still
file_a
file_b
file_c
Anyone can help???
Smilie Smilie Smilie
#!/bin/bash
while read line
do
if [[ -r $line ]]
then
sed -e '/$line/d' $1 > $1.tmp
mv $1.tmp $1
else
echo "file not readable"
fi
done < $1
 

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Directory::Scratch::Structured(3pm)			User Contributed Perl Documentation		       Directory::Scratch::Structured(3pm)

NAME
Directory::Scratch::Structured - creates temporary files and directories from a structured description SYNOPSIS
my %tree_structure = ( dir_1 => { subdir_1 =>{}, file_1 =>[], file_a => [], }, dir_2 => { subdir_2 => { file_22 =>[], file_2a =>[], }, file_2 =>[], file_a =>['12345'], file_b =>[], }, file_0 => [] , ) ; use Directory::Scratch::Structured qw(create_structured_tree) ; my $temporary_directory = create_structured_tree(%tree_structure) ; or use Directory::Scratch ; use Directory::Scratch::Structured qw(piggyback_directory_scratch) ; my $temporary_directory = Directory::Scratch->new; $temporary_directory->create_structured_tree(%tree_structure) ; DESCRIPTION
This module adds a create_structured_tree subroutine to the Directory::Scratch. DOCUMENTATION
I needed a subroutine to create a bunch of temporary directories and files while running tests. I used the excellent Directory::Scratch to implement such a functionality. I proposed the subroutine to the Directory::Scratch author but he preferred to implement a subroutine using an unstructured input data based on the fact that Directory::Scratch didn't use structured data. This is, IMHO, flawed design, though it may require slightly less typing. I proposed a hybrid solution to reduce the amount of subroutines and integrate the subroutine using structured input into Directory::Scratch but we didn't reach an agreement on the API. Instead I decided that I would piggyback on Directory::Scratch. You can access create_structured_tree through a subroutine or a method through a Directory::Scratch object. Whichever interface you choose, the argument to the create_structured_tree consists of tuples (hash entries). The key represents the name of the object to create in the directory. If the value is of type: ARRAY A file will be created, it's contents are the contents of the array (See Directory::Scratch) HASH A directory will be created. the element of the hash will also be , recursively, created OTHER The subroutine will croak. SUBROUTINES
/METHODS create_structured_tree use Directory::Scratch::Structured qw(create_structured_tree) ; my $temporary_directory = create_structured_tree(%tree_structure) ; my $base = $temporary_directory->base() ; Returns a default Directory::Scratch object. directory_scratch_create_structured_tree Adds create_structured_tree to Directory::Scratch when you Load Directory::Scratch::Structured with the piggyback_directory_scratch option. use Directory::Scratch ; use Directory::Scratch::Structured qw(piggyback_directory_scratch) ; my $temporary_directory = Directory::Scratch->new; $temporary_directory->create_structured_tree(%tree_structure) ; _create_structured_tree Used internally by both interfaces piggyback Used internally to piggyback Directory::Scratch. BUGS AND LIMITATIONS
None so far. AUTHOR
Khemir Nadim ibn Hamouda CPAN ID: NKH mailto:nadim@khemir.net LICENSE AND COPYRIGHT
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SUPPORT
You can find documentation for this module with the perldoc command. perldoc Directory::Scratch::Structured You can also look for information at: o AnnoCPAN: Annotated CPAN documentation <http://annocpan.org/dist/Directory-Scratch-Structured> o RT: CPAN's request tracker Please report any bugs or feature requests to L <bug-directory-scratch-structured@rt.cpan.org>. We will be notified, and then you'll automatically be notified of progress on your bug as we make changes. o Search CPAN <http://search.cpan.org/dist/Directory-Scratch-Structured> SEE ALSO
Directory::Scratch perl v5.10.1 2010-03-22 Directory::Scratch::Structured(3pm)
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