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Full Discussion: Simple file checking script
Top Forums Shell Programming and Scripting Simple file checking script Post 302098239 by _Spare_Ribs_ on Friday 1st of December 2006 12:11:04 PM
Old 12-01-2006
Simple file checking script

Hi,

I have a really, what I hope is, simple question.

I'm looking for a simple way to see whether a file exists or not and then perform an action based on whether it exists or not. An example of what I tried is as follows:

Code:
if [ "ls /etc/init.d/ | grep mysql" = "mysql" ]
  then {
    echo "File mysql exists"
    some_other_commands_might_go_here;
  }
else {
  echo "File mysql does not exist"
  something_else_to_do_goes_here;
}
fi

Thing is, this doesn't work, so is it something to do with my syntax, or am I just being stupid? Or perhaps a bit of both?

Regards,

Paulo
 

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CGI::Session::Driver::mysql(3)				User Contributed Perl Documentation			    CGI::Session::Driver::mysql(3)

NAME
CGI::Session::Driver::mysql - CGI::Session driver for MySQL database SYNOPSIS
$s = new CGI::Session( 'driver:mysql', $sid); $s = new CGI::Session( 'driver:mysql', $sid, { DataSource => 'dbi:mysql:test', User => 'sherzodr', Password => 'hello' }); $s = new CGI::Session( 'driver:mysql', $sid, { Handle => $dbh } ); DESCRIPTION
mysql stores session records in a MySQL table. For details see CGI::Session::Driver::DBI, its parent class. It's especially important for the MySQL driver that the session ID column be defined as a primary key, or at least "unique", like this: CREATE TABLE sessions ( id CHAR(32) NOT NULL PRIMARY KEY, a_session TEXT NOT NULL ); To use different column names, change the 'create table' statement, and then simply do this: $s = new CGI::Session('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', DataSource=>'dbi:mysql:project', }); or $s = new CGI::Session('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', Handle=>$dbh, }); DRIVER ARGUMENTS mysql driver supports all the arguments documented in CGI::Session::Driver::DBI. In addition, DataSource argument can optionally leave leading "dbi:mysql:" string out: $s = new CGI::Session( 'driver:mysql', $sid, {DataSource=>'shopping_cart'}); # is the same as: $s = new CGI::Session( 'driver:mysql', $sid, {DataSource=>'dbi:mysql:shopping_cart'}); BACKWARDS COMPATIBILITY As of V 4.30, the global variable $CGI::Session::MySQL::TABLE_NAME cannot be used to set the session table's name. This is due to changes in CGI::Session::Driver's new() method, which now allows the table's name to be changed (as well as allowing both the 'id' column name and the 'a_session' column name to be changed). See the documentation for CGI::Session::Driver::DBI for details. In particular, the new syntax for "new()" applies to all database drivers, whereas the old - and bad - global variable method only applied to MySQL. Alternately, call $session -> table_name('new_name') just after creating the session object if you wish to change the session table's name. LICENSING
For support and licensing see CGI::Session. perl v5.16.3 2008-07-16 CGI::Session::Driver::mysql(3)
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