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Top Forums Shell Programming and Scripting What is the purpose of "-z" string checking? Post 302852601 by vidyadhar85 on Thursday 12th of September 2013 02:02:54 AM
Old 09-12-2013
It checks if the length of the string is zero or not.

In your case they want to perform some actions if PID is not forund for a java process
 

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serialver(1)						      General Commands Manual						      serialver(1)

NAME
serialver - serial version command SYNOPSIS
serialver [ options ] [ classnames ] options Command-line options, as specified in this document. classnames One or more class names. DESCRIPTION
serialver returns the serialVersionUID for one or more classes in a form suitable for copying into an evolving class. When invoked with no arguments, it prints a usage line. OPTIONS
-classpath <directories and zip/jar files separated by:> Set search path for application classes and resources. -show Displays a simple user interface. Enter the full class name and press either the Enter key or the Show button to display the serialVersionUID. -Joption Pass option to the Java virtual machine, where option is one of the options described on the man page for the java applica- tion launcher, java(1). For example, -J-Xms48m sets the startup memory to 48 megabytes. It is a common convention for -J to pass options to the underlying virtual machine. SEE ALSO
See (or search java.sun.com) for the following: java.io.ObjectStreamClass @ http://java.sun.com/j2se/1.5/docs/api/java/io/ObjectStreamClass.html 24 June 2004 serialver(1)
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