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Full Discussion: Making 99 folders 99 folders deep
Top Forums Shell Programming and Scripting Making 99 folders 99 folders deep Post 302517066 by alister on Tuesday 26th of April 2011 02:36:26 AM
Old 04-26-2011
Quote:
Originally Posted by YukonAppleGeek
I am trying to make 5 sub folders with out having to copy/paste/reformat the code. I know it is posable but i am wondering if there is a easer way of do that, i am also some what new to unix shell scripting. (I also will probably not do 99 folders more like 20-50)
If your intention is to implement the algorithm in your original post, you really need to come to terms with the numbers you'd be dealing with. Based on how far you got in 23 minutes, and generously slashing the time per directory from 1.5 milliseconds to 1 millisecond flat, the following is approximately how long it would take to create n levels of n directories in each directory:

Code:
20:  3 trillion millenia
15:  14,000 millenia
10:  4 months
 9:  4.5 days
 8:  4.5 hours
 7:  14 minutes
 6:  47 seconds
 5:  3 seconds

It blows up quickly, so you'll probably want to keep it small. If you don't mind saying, why are you doing this? I'm curious.

Regards,
Alister

The arithmetic:
((((((20^20) * .001) / 60) / 60) / 24) / 365) / 1 000 = 3.32501268 × 10^12
((((((15^15) * .001) / 60) / 60) / 24) / 365) / 1 000 = 13,885.5242
(((((10^10) * .001) / 60) / 60) / 24) / 30 = 3.85802469
((((9^9) * .001) / 60) / 60) / 24 = 4.48403344
(((8^8) * .001) / 60) / 60 = 4.66033778
((7^7) * .001) / 60 = 13.7257167
(6^6) * .001 = 46.65600
(5^5) * .001 = 3.12500
 

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LEARN ABOUT DEBIAN

dahdi_hardware

DAHDI_HARDWARE(8)					User Contributed Perl Documentation					 DAHDI_HARDWARE(8)

NAME

       dahdi_hardware - Shows Dahdi hardware devices.

SYNOPSIS

       dahdi_hardware [-v][-x]

OPTIONS

       -v  Verbose ouput - show spans used by each device etc. Currently only implemented for the Xorcom Astribank.

       -x  Show disconnected Astribank unit, if any.

DESCRIPTION

       Show all dahdi hardware devices. Devices are recognized according to lists of PCI and USB IDs in Dahdi::Hardware::PCI.pm and
       Dahdi::Hardware::USB.pm . For PCI it is possible to detect by sub-vendor and sub-product ID as well.

       The first output column is the connector: a bus specific field that shows where this device is.

       The second field shows which driver should handle the device. a "-" sign marks that the device is not yet handled by this driver. A "+"
       sign means that the device is handled by the driver.

       For the Xorcom Astribank (and in the future: for other Dahdi devices) some further information is provided from the driver. Those extra
       lines always begin with spaces.

       Example output:

       Without drivers loaded:

	 usb:001/002	    xpp_usb-	 e4e4:1152 Astribank-multi FPGA-firmware
	 usb:001/003	    xpp_usb-	 e4e4:1152 Astribank-multi FPGA-firmware
	 pci:0000:01:0b.0   wctdm-	 e159:0001 Wildcard TDM400P REV H

       With drivers loaded, without -v:
	 usb:001/002	    xpp_usb+	 e4e4:1152 Astribank-multi FPGA-firmware
	 usb:001/003	    xpp_usb+	 e4e4:1152 Astribank-multi FPGA-firmware
	 pci:0000:01:0b.0   wctdm+	 e159:0001  Wildcard TDM400P REV E/F

       With drivers loaded, with -v:
	 usb:001/002	    xpp_usb+	 e4e4:1152 Astribank-multi FPGA-firmware
	  LABEL=[usb:123] CONNECTOR=usb-0000:00:1d.7-1
		 XBUS-00/XPD-00: FXS	  Span 2
		 XBUS-00/XPD-10: FXS	  Span 3
		 XBUS-00/XPD-20: FXS	  Span 4
		 XBUS-00/XPD-30: FXS	  Span 5
	 usb:001/003	    xpp_usb+	 e4e4:1152 Astribank-multi FPGA-firmware
	  LABEL=[usb:4567] CONNECTOR=usb-0000:00:1d.7-4
		 XBUS-01/XPD-00: FXS	  Span 6 XPP-SYNC
		 XBUS-01/XPD-10: FXO	  Span 7
		 XBUS-01/XPD-20: FXO	  Span 8
		 XBUS-01/XPD-30: FXO	  Span 9
	 pci:0000:01:0b.0   wctdm+	 e159:0001  Wildcard TDM400P REV E/F

perl v5.14.2							    2009-04-20							 DAHDI_HARDWARE(8)
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