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Top Forums Shell Programming and Scripting File handling, getopts command in unix Post 302210545 by bab123 on Tuesday 1st of July 2008 07:42:41 AM
File handling, getopts command in unix

I need to create a shell script having the menu with few options such as
1. Listing 2. Change permissions 3. Modify Contents 4. Delete Files 5. Exit

1. For 1. Listing: Display a special listing of files showing their date of modification and access time (side by side) along with their permissions, sizes and filenames. The script should accept any number of arguments to display a selective listing and should abort if no filenames are specified as arguments. Provide headers for the columns and take care of all validations.
Note: Files have to be searched in present working directory only
2. For 2. Change permissions: Accept files and the permissions to be made available. Change the permissions accordingly.
3. For 3. Modify Contents: Accept a file name and use any editor to modify the contents as per user's choice
Note: Consider only .txt files, else modifying contents of binary files will lead to them being corrupted. So, exit if file is not a .txt file.
4. For 4. Delete Files: Accept a file name(s) and delete the file if available, else display error message
5. For 5. Exit : Exit the application
6. For implementing these options use getopts command appropriately.

can some one help me ?
Thanks in advance
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File::Listing(3)					User Contributed Perl Documentation					  File::Listing(3)

File::Listing - parse directory listing SYNOPSIS
use File::Listing qw(parse_dir); $ENV{LANG} = "C"; # dates in non-English locales not supported for (parse_dir(`ls -l`)) { ($name, $type, $size, $mtime, $mode) = @$_; next if $type ne 'f'; # plain file #... } # directory listing can also be read from a file open(LISTING, "zcat ls-lR.gz|"); $dir = parse_dir(*LISTING, '+0000'); DESCRIPTION
This module exports a single function called parse_dir(), which can be used to parse directory listings. The first parameter to parse_dir() is the directory listing to parse. It can be a scalar, a reference to an array of directory lines or a glob representing a filehandle to read the directory listing from. The second parameter is the time zone to use when parsing time stamps in the listing. If this value is undefined, then the local time zone is assumed. The third parameter is the type of listing to assume. Currently supported formats are 'unix', 'apache' and 'dosftp'. The default value is 'unix'. Ideally, the listing type should be determined automatically. The fourth parameter specifies how unparseable lines should be treated. Values can be 'ignore', 'warn' or a code reference. Warn means that the perl warn() function will be called. If a code reference is passed, then this routine will be called and the return value from it will be incorporated in the listing. The default is 'ignore'. Only the first parameter is mandatory. The return value from parse_dir() is a list of directory entries. In a scalar context the return value is a reference to the list. The directory entries are represented by an array consisting of [ $filename, $filetype, $filesize, $filetime, $filemode ]. The $filetype value is one of the letters 'f', 'd', 'l' or '?'. The $filetime value is the seconds since Jan 1, 1970. The $filemode is a bitmask like the mode returned by stat(). COPYRIGHT
Copyright 1996-2010, Gisle Aas Based on (from Lee McLoughlin's ftp mirror package) and Net::FTP's parse_dir (Graham Barr). This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.18.2 2012-02-15 File::Listing(3)

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