Snippets

TOC

• OS command call
• Resumable Session Logon Trigger
• Weekday from log
• Last day of month
• Pass arrays to a subroutine
• List only directories

Programming

PHP

Perl

OS command call

with `…`

# Positiv result
$msg = `ping -c 1 green`;
$rc = $?;
print "rc = $rc\n";
print "msg= $msg\n";

# Negativ result
$msg = `ping -c 1 red`;
$rc = $?;
print "rc = $rc\n";
print "msg= $msg\n";

with system()

# Positiv result
$cmd = 'ping -c 1 green';
$msg = system($cmd);
$rc = $?;
print "rc = $rc\n";
print "msg= $msg\n";

# Negativ result
$cmd = 'ping -c 1 red';
$msg = system($cmd);
$rc = $?;
print "rc = $rc\n";
print "msg= $msg\n";

Weekday from log

use strict;
use warnings "all";
use Time::Local;

my ($year, $month, $day, $epoch, $wday);

my $file_name = $ARGV[0];

open(LOG, "<$file_name") or die "Cannot open file $file_name\n";

while ( <> ) {
  chomp;
  if ( m/^(\d\d\d\d-\d\d-\d\d)\s\d\d:\d\d:\d\d\s-\s/ ) {
    ($year, $month, $day) = split('-', $1);
    $month -= 1;
    $epoch = timelocal(00, 00, 00, $day, $month, $year);
    (undef,undef,undef,undef,undef,undef,$wday,undef,undef) = localtime($epoch);
    if ( $wday == 0 || $wday == 6 ) {
      print $_ . "\n";
    }
  }
}
close(LOG);

exit(0);

Pass arrays to a subroutine

#!/usr/bin/perl

use strict;
use warnings;

sub deref
{
  my $xref = $_[0];
  my $yref = $_[1];

  foreach (@$xref) {
    print $_ . "\n";
  }

  print "\n";

  foreach (@$yref) {
    print $_ . "\n";
  }
}

my @a = ('a', 'b', 'c');
my @b = ('1', '2', '3');

&deref( \@a, \@b );
exit 0;

List only directories

#!/usr/bin/perl

use strict;
use warnings;

my @lFiles = glob "*";

foreach ( @lFiles ) {
  print $_;

  if ( -d $_ ) {
    print "is directory\n";
  }
  else {
    print "is NOT directory\n";
  }
}</pre>
  </td></tr></tbody>
</table>

PL/SQL

Resumable session logon trigger

CREATE OR REPLACE TRIGGER resumable_session_logon_trigger
AFTER LOGON ON DATABASE
DECLARE
  v_sid      NUMBER;
  v_serial#  NUMBER;
  v_program  VARCHAR2(15);
  v_osuser   VARCHAR2(16);
  v_machine  VARCHAR2(12);
  v_username VARCHAR2(30);
BEGIN

  SELECT sid, serial#, SUBSTR(program, 1, 15), osuser, SUBSTR(machine, 1, 12), username
    INTO v_sid, v_serial#, v_program, v_osuser, v_machine, v_username
    FROM v$session
   WHERE audsid = USERENV('sessionid')
     AND sid = (SELECT sid FROM v$mystat WHERE rownum < 2);

  -- 15 chars only!!!
  -- IF v_program = 'passba5' THEN
  -- IF v_machine = 'EWP\NB-91497' THEN
  -- IF v_osuser = 'tksdr' THEN
  IF v_username ='DAGODP' THEN
    EXECUTE IMMEDIATE('ALTER SESSION ENABLE RESUMABLE TIMEOUT 7200 NAME '
                   || ''logon trigger resumable session for user '
                   || v_username || '''');
  END IF;
END;
/

SELECT trigger_name, status, action_type
  FROM dba_triggers
 WHERE owner = 'SYS'
;

awk

bash/ksh/sh

Last day of month

#!/bin/sh

if test `TZ=CET-24 date +%d` = 1; then
   echo "Today IS the last day of month"
else
   echo "Today is NOT the last day of month"
fi

Sources / Literature