S Y S T E M M O N I T O R L O G
Linux system 4.4.0-22-generic #1 Sun Oct 9 20:21:24 EDT 2016
+GNU/Linux
Log report for righthere.home.org on Sun 23 Oct 2016 04:23:24 PM EDT
==============================================================Search for-> FAILED starting 04:23:24 PM
Oct 23 16:23:04 righthere login[1769]: FAILED LOGIN 3 FROM (null) FOR
bball,
+Authentication failureEnd of /tmp/FAILED.logreport.102303 at 04:23:24 PMTo further automate the process, you can include command lines using the
script in another script to generate a series of searches and reports.
Built-in Variables
Built-in variables are special variables that Linux provides to the shell that
you can use to make decisions within a shell program. You cannot modify the
values of these variables within the shell program.
The following are some of the built-in variables:
$#—The number of positional parameters passed to the shell program
$?—The completion code of the last command or shell program executed
within the shell program (returned value)
$0—The name of the shell program
$*—A single string of all arguments passed at the time of invocation of
the shell programTo show these built-in variables in use, here is a sample program called
mypgm2:
Click here to view code image
#!/bin/sh
#my test program
echo "Number of parameters is $#"
echo "Program name is $0"
echo "Parameters as a single string is $*"
If you execute mypgm2 from the command line in pdksh and bash as
follows:
Click here to view code image
matthew@seymour:~$ bash mypgm2 Alan Turing