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Full Discussion: Why is ./ sometimes needed?
Top Forums Shell Programming and Scripting Why is ./ sometimes needed? Post 303029669 by wisecracker on Wednesday 30th of January 2019 10:16:08 AM
Old 01-30-2019
Quote:
Originally Posted by Xubuntu56
I appreciate the help; I've learned a lot!

Here`s the original script, which I did not write.



Code:
#!/bin/bash
 

# Proper header for a Bash script
# cleanup2: improved
# Run as root, of course.
# Insert code here to print error message and exit if not root.

LOG_DIR=/var/log
# Variables are better that hard-coded values.
cd $LOG_DIR

cat /dev/null > messages
cat /dev/null > wtmp

echo "Logs cleaned up."

exit    #  The right and proper method of "exiting" from a script.
        # A bare "exit" (no parameter) returns the exit status
        #+ of the preceding command.

IS THAT IT, (and needs to be run from root)?
Why use:
Code:
cat /dev/null > messages
cat /dev/null > wtmp

When:
Code:
: > messages
: > wtmp

......is much simpler.
Useless use of cat?
No disrespect to you Xubuntu56, you are innocent of this one...
BUT THAT........
........guys was the improved version, what was the original like I wonder!

Last edited by wisecracker; 01-30-2019 at 11:29 AM..
This User Gave Thanks to wisecracker For This Post:
 

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Plack::App::CGIBin(3pm) 				User Contributed Perl Documentation				   Plack::App::CGIBin(3pm)

NAME
Plack::App::CGIBin - cgi-bin replacement for Plack servers SYNOPSIS
use Plack::App::CGIBin; use Plack::Builder; my $app = Plack::App::CGIBin->new(root => "/path/to/cgi-bin")->to_app; builder { mount "/cgi-bin" => $app; }; # Or from the command line plackup -MPlack::App::CGIBin -e 'Plack::App::CGIBin->new(root => "/path/to/cgi-bin")->to_app' DESCRIPTION
Plack::App::CGIBin allows you to load CGI scripts from a directory and convert them into a PSGI application. This would give you the extreme easiness when you have bunch of old CGI scripts that is loaded using cgi-bin of Apache web server. HOW IT WORKS
This application checks if a given file path is a perl script and if so, uses CGI::Compile to compile a CGI script into a sub (like ModPerl::Registry) and then run it as a persistent application using CGI::Emulate::PSGI. If the given file is not a perl script, it executes the script just like a normal CGI script with fork & exec. This is like a normal web server mode and no performance benefit is achieved. The default mechanism to determine if a given file is a Perl script is as follows: o Check if the filename ends with ".pl". If yes, it is a Perl script. o Open the file and see if the shebang (first line of the file) contains the word "perl" (like "#!/usr/bin/perl"). If yes, it is a Perl script. You can customize this behavior by passing "exec_cb" callback, which takes a file path to its first argument. For example, if your perl-based CGI script uses lots of global variables and such and are not ready to run on a persistent environment, you can do: my $app = Plack::App::CGIBin->new( root => "/path/to/cgi-bin", exec_cb => sub { 1 }, )->to_app; to always force the execute option for any files. AUTHOR
Tatsuhiko Miyagawa SEE ALSO
Plack::App::File CGI::Emulate::PSGI CGI::Compile Plack::App::WrapCGI See also Plack::App::WrapCGI if you compile one CGI script into a PSGI application without serving CGI scripts from a directory, to remove overhead of filesystem lookups, etc. perl v5.14.2 2011-11-02 Plack::App::CGIBin(3pm)
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