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Does your hadoop fs allow for the -b option to output byte sizes?
If not: your problem has been solved umpteen times in these fora; try searching in here...

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pamusb-check

pamusb-check(1) 						      PAM_USB							   pamusb-check(1)

NAME

       pamusb-check - simulates pam_usb authentication

SYNOPSIS

       Usage: pamusb-check [--help] [--debug] [--config=path] [--service=name] [--dump]
       [--quiet] <username>

DESCRIPTION

       pamusb-check can simulate authentication through the pam_usb engine.  It is useful for both testing purposes (to check the pam_usb configu-
       ration without having to try with a real program), but also for scripting. pamusb-check's exit code is 0 if the authentication was success-
       ful, 1 otherwise.  It is used by pamusb-agent to check the device.

EXAMPLES

       $ pamusb-check scox

       o  Authentication request for user "scox" (pamusb-check)

       o  Device "creative" is connected (good).

       o  Access granted.

       $ pamusb-check --service=su scox

       o  Authentication request for user "scox" (su)

       o  Device "creative" is connected (good).

       o  Access granted.

       $ pamusb-check --dump scox

       Configuration dump for user scox (service: pamusb-check):

       enable : true

       debug  : false

       quiet  : false

       color_log
	      : true

       one_time_pad
	      : true

       probe_timeout
	      : 10

       hostname
	      : helium

       system_pad_directory
	      : .pamusb

       device_pad_directory
	      : .pamusb

OPTIONS

       --help, -h
	      Show summary of options.

       --debug, -D
	      Shows debug messages.

       --config, -c
	      Use the given configuration file (defaults to /etc/pamusb.conf).	--service, -s Service name to be used for authentication (defaults
	      to pamusb-check)

       --dump, -d
	      Dump the configuration, but do not try to authenticate

       --quiet, -q
	      Quiet mode

BUGS

       Please send bug reports to the pam_usb mailing list.

AUTHOR

       Andrea Luzzardi <scox@sig11.org>

								September 12, 2007						   pamusb-check(1)