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Full Discussion: Multidimensional array
Top Forums Shell Programming and Scripting Multidimensional array Post 303021805 by annacreek on Friday 17th of August 2018 12:39:40 PM
Old 08-17-2018
Multidimensional array
I am learning about bash system variables, such as $ , @ and #.

I have this piece of script implementing an array and it is doing its job just fine.

This is not the only array I will be using.

Just for ease of maintenance and more coding I would like to have the arrays in two dimensional fashion so I can put all of them in one physical place.



In pseudocode

Code:
array 

         arraySYSTEM=( "$@" )
         arrayUSB=( "$@" )
         arrayXXX=( "$@" )

I am still not to sure how the symbols $@ used in this code actually work.

So - how do I implement two dimension array using system arables?





Code:
 echo "#declare an arraySYSTEM   @line $LINENO "  
 788  arraySYSTEM=( "$@" )
 789 #temporary use lsusb commnds  
 790 set -- lsusb " Debug component SYSTEM " "TEST parameter lsusb -v" "lsusb -$
 791 echo "$#"       # number of elements in array
 792 echo "$@"       # contents  of array 
 793 # do common function  
 794                 ;;

 

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LEARN ABOUT NETBSD

lsusb

lsusb(8)							Linux USB Utilities							  lsusb(8)

NAME

       lsusb - list USB devices

SYNOPSIS

       lsusb [ options ]

DESCRIPTION

       lsusb is a utility for displaying information about USB buses in the system and the devices connected to them.

OPTIONS

       -v, --verbose
	      Tells lsusb to be verbose and display detailed information about the devices shown.  This includes configuration descriptors for the
	      device's current speed.  Class descriptors will be shown, when available, for USB device classes including hub, audio, HID, communi-
	      cations, and chipcard.

       -s [[bus]:][devnum]
	      Show only devices in specified bus and/or devnum.  Both ID's are given in decimal and may be omitted.

       -d [vendor]:[product]
	      Show only devices with the specified vendor and product ID.  Both ID's are given in hexadecimal.

       -D device
	      Do  not  scan  the /dev/bus/usb directory, instead display only information about the device whose device file is given.	The device
	      file should be something like /dev/bus/usb/001/001.  This option displays detailed information like the v option; you must  be  root
	      to do this.

       -t     Tells lsusb to dump the physical USB device hierarchy as a tree. This overrides the v option.

       -V, --version
	      Print  version information on standard output, then exit successfully.

RETURN VALUE

       If the specified device is not found, a non-zero exit code is returned.

FILES

       /var/lib/usbutils/usb.ids
	      A list of all known USB ID's (vendors, products, classes, subclasses and protocols).

SEE ALSO

       lspci(8), usbview(8).

AUTHOR

       Thomas Sailer, <sailer@ife.ee.ethz.ch>.

usbutils-007							    6 May 2009								  lsusb(8)
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