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2010-11-19

example perl script with default args and logging



use strict;
use warnings 'all';
use Archive::Tar;
 
my $DebugLevel = 3 ; 
print defined($ARGV[0]) ? $DebugLevel = $ARGV[0] : "Using max DebugLevel = $DebugLevel", " \n";
my $minimumAmountOfCommandLineArgs = 1 ; 
 
 
sub main 
{
logMsg("$0 SCRIPT START " , 1 );
#Action !!!    call here methods
checkCommandLineArgs();        
logMsg("$0 SCRIPT STOP " , 1 );
} #eof sub main
 
 
 
sub checkCommandLineArgs
{
 
if ( @ARGV != $minimumAmountOfCommandLineArgs )
{
logErrorMsg ( "Not enougn command line args supplied exit 1" , 1 );
die "usage: $0 1 args \n" ; 
exit 1 ; 
} #eof if
else 
{
foreach (@ARGV) { logMsg ( "$_ " ) ;  }
} #eof else         if ( @ARGV != 4 )
 
 
} #eof sub checkCommandLineArgs
 
#log a message according to the DebugLevel
sub logMsg 
{
my $msg = shift ;
my $importance = shift ; 
my $CurrentPerlScriptName = "$0" ; 
my $niceMonth = GetANiceMonth (); 
my $logFile = "$CurrentPerlScriptName" . '_' . "$niceMonth" .  '.log' ; 
$msg = GetANiceTime () .' --- ' .   $msg . " \n" ; 
if ( $importance == 1 ) 
{
$msg = "\n============================================================ \n" . $msg ; 
$msg = $msg . "============================================================ \n" ;
}
#debug nothing
if ( $DebugLevel == 0 ) {     return ; } 
#just print the message
if ( $DebugLevel == 1 ) 
{
print $msg 
} #eof if ( $DebugLevel == 1 ) 
 
#print the message in 
if ( $DebugLevel == 2 ) 
{
#READ ALL ROWS OF A FILE TO ALIST 
open (LOG, ">> $logFile") || print "could not open the \$logFile $logFile !!!\n"; 
print LOG $msg  ; 
close LOG;
}
 
#print the message in 
if ( $DebugLevel == 3 ) 
{
#READ ALL ROWS OF A FILE TO ALIST 
open (LOG, ">> $logFile") || print "could not open the \$logFile $logFile !!!\n"; 
print LOG $msg  ; 
close LOG;
print $msg ; 
} #eof if ( $DebugLevel == 3 ) 
 
 
} #eof sub logMsg 
 
#log a message according to the DebugLevel
sub logErrorMsg 
{
my $errorMsg = shift ; 
my $importance  = shift ; 
my $CurrentPerlScriptName = "$0" ; 
my $niceMonth = GetANiceMonth (); 
my $errorLogFile = "$CurrentPerlScriptName" . "_" .  "$niceMonth" . '.error.log' ; 
$errorMsg = GetANiceTime () .' --- ' .   $errorMsg . " \n" ; 
 
if ( $importance == 1 ) 
{
$errorMsg = "\n============================================================ \n" . $errorMsg ; 
$errorMsg= $errorMsg. "============================================================ \n" ;
}
 
#debug nothing
if ( $DebugLevel == 0 ) {     return ; } 
#just print the message
if ( $DebugLevel == 1 )  {         print $errorMsg ;     } 
 
#print the message in a error log file
if ( $DebugLevel == 2 ) 
{
#READ ALL ROWS OF A FILE TO ALIST 
open (ERRLOG, ">> $errorLogFile") || print "could not open the \$errorLogFile $errorLogFile !!!\n"; 
print ERRLOG $errorMsg ; 
close ERRLOG;
}
 
#print the message in 
if ( $DebugLevel == 3 ) 
{
#READ ALL ROWS OF A FILE TO ALIST 
open (ERRLOG, ">> $errorLogFile") || print "could not open the \$errorLogFile $errorLogFile !!!\n"; 
print ERRLOG $errorMsg  ; 
close ERRLOG;
print $errorMsg ; 
} #eof if ( $DebugLevel == 3 ) 
 
 
} #eof sub logErrorMsg 
 
 
#GET A NICE TIME 
sub GetANiceTime {
# Purpose: returns the time in yyyymmdd-format 
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time); 
#---- change 'month'- and 'year'-values to correct format ---- 
$min = "0$min" if ($min < 10); 
$hour = "0$hour" if ($hour < 10);
$mon = $mon + 1;
$mon = "0$mon" if ($mon < 10); 
$year = $year + 1900;
$mday = "0$mday" if ($mday < 10); 
return "$year\.$mon\.$mday" . "-" . "$hour\:$min\:$sec"; 
} #eof sub GetANiceTime
 
 
sub GetANiceMonth {
# Purpose: returns the time in yyyymmdd-format 
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time); 
#---- change 'month'- and 'year'-values to correct format ---- 
$mon = $mon + 1;
$mon = "0$mon" if ($mon < 10); 
$year = $year + 1900;
return "$year\.$mon" ; 
} #eof sub GetANiceTime
 
 
#Action !!!
main(); 
 
1 ; 
 
__END__
 
 
#Version
#1.0.20101117_110231 --- Yordan Georgiev --- Initial version , copy from Net + args passing 
#1.1.20101118_093059 --- Yordan Georgiev --- Added (error)logging according to DebugLevel 

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