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Full Discussion: Pointer for current field???
Top Forums UNIX for Dummies Questions & Answers Pointer for current field??? Post 302542490 by statichazard on Wednesday 27th of July 2011 08:02:59 PM
Old 07-27-2011
Pointer for current field???
I'm writing my first bash function, and I'm having a little bit of trouble getting used to the syntax. I have been told that it is very similar to Java, but I'm still not quite getting it.

The situation that I am dealing with is checking the values on input fields. There will be anywhere between two and five fields, so the code has to be able to adapt. The fields with either be a string, or a number. This is what I have so far...I am also using the match function, which I have never used before.

This function takes place within a file, which is used as a set of rules to be executed in an awk statement.
Code:
#is there a way to make a pointer for the field you are currently looking at?

function get(){
 #do bash functions take on parameters?
 #I don't know if it will be executed like get($i) or $i.get()?

if ( match( CURRENT FIELD? /‘0' | [1-9][0-9]*/)
     do something
if ( match( CURRENT FIELD? /[a-z]+/)
     do something else
}

So, my question is, is there a way to have a pointer for the current field? I need to check each one, one by one, every time. I haven't been able to find this answer anywhere else, so I'm hoping someone can help me out.

Also, does the function in bash take parameters? Or would it be executed get( current field variable...???) or currentfieldvariable.get()?

I don't really need help with the "do something else" part of the code, because I know how to do it.
 

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LEARN ABOUT OSX

java_home

java_home(1)						      General Commands Manual						      java_home(1)

NAME

       java_home - return a value for $JAVA_HOME

SYNOPSIS

       /usr/libexec/java_home [options]

DESCRIPTION

       The  java_home  command	returns  a  path suitable for setting the JAVA_HOME environment variable.  It determines this path from the user's
       enabled and preferred JVMs in the Java Preferences application.	Additional constraints may be provided to filter the list of  JVMs  avail-
       able.  By default, if no constraints match the available list of JVMs, the default order is used.  The path is printed to standard output.

OPTIONS

       -v or --version	version
	      Filters the returned JVMs by the major platform version in "JVMVersion" form. Example versions: "1.5+", or "1.6*".

       -a or --arch  architecture
	      Filters the returned JVMs by the architecture they support. Example architectures: "i386", "x86_64", or "ppc".

       -d or --datamodel  datamodel
	      Filters  the  returned JVMs capable of running in 32 or 64-bit mode. Supported datamodels: "-d32" and "-d64". Specifying a datamodel
	      is synonymous with specifying a particular architecture.

       -t or --task  task
	      Selects from the list of JVMs which can run a specific task. The order of each of these lists is set by the Java Preferences  appli-
	      cation. Supported tasks: "Applets", "WebStart", "BundledApp", "JNI" and "CommandLine". The default task is "CommandLine".

       -F or --failfast
	      Immediately fails when filters return no JVMs; does not print out the path to the default $JAVA_HOME.

       --exec  command ...
	      Executes the command at $JAVA_HOME/bin/<command> and passes the remaining arguments. Any arguments to select which $JAVA_HOME to use
	      must precede the --exec option.

       -X or --xml
	      Prints the list of selected JVMs and associated properties as an XML plist to stdout.

       -V or --verbose
	      Prints the matching list of JVMs and architectures to stderr.

       -h or --help
	      Brief usage information.

USAGE

       /usr/libexec/java_home helps users set a $JAVA_HOME in their login rc files, or provides a way for command-line Java tools to use the  most
       appropriate  JVM  which	can  satisfy  a  minimum version or architecture requirement. The --exec argument can invoke tools in the selected
       $JAVA_HOME/bin directory, which is useful for starting Java command-line tools from launchd plists without hardcoding the full path to  the
       Java command-line tool.

       Usage for bash-style shells:
	      $ export JAVA_HOME=`/usr/libexec/java_home`

       Usage for csh-style shells:
	      % setenv JAVA_HOME `/usr/libexec/java_home`

								  04 August 2010						      java_home(1)
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