10-01-2012
sh file: READ (menu) but now run with option
I have a script which uses READ to detect choice of menu option...now I want to change the script without doing whole rewrite such that when user runs ./script.sh 5 it would execute menu option 5 rather than user running ./script.sh waiting for it to load and then pressing "5 enter"
Is it possible to keep both functionalities (user can select from menu if no variable is passed or user can pass option upon running)....
Thanks!
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LEARN ABOUT DEBIAN
scsi_readcap
SCSI_READCAP(8) SG3_UTILS SCSI_READCAP(8)
NAME
scsi_readcap - do SCSI READ CAPACITY command on disks
SYNOPSIS
scsi_readcap [--brief] [--help] [--long] [--verbose] DEVICE [DEVICE]*
DESCRIPTION
This Bourne shell script calls the sg_readcap utility on each given DEVICE. This will send a SCSI READ CAPACITY command to each DEVICE.
The default action of this script is to send the 10 byte cdb READ CAPACITY(10) command to each DEVICE. If a response indicates the number
of blocks is greater than or equal to '2**32 - 1' then the READ CAPACITY(16) is sent and its response is output.
OPTIONS
Arguments to long options are mandatory for short options as well.
-b, --brief
shortens the output to two hexadecimal numbers, both prefixed by '0x'. The first number is the number of blocks available and the
second is the size of each blocks in bytes (e.g. '0x12a19eb0 0x200'). If an error is detected '0x0 0x0' is output and the script
continues if there are more DEVICEs.
-h, --help
print out the usage message then exit.
-l, --long
the default is to send the READ CAPACITY(10) command (i.e. the 10 byte cdb variant). When this option is given the READ CAPACITY(16)
command is sent. The latter command yields more information in its response.
-v, --verbose
increase level or verbosity.
EXIT STATUS
The exit status of this script is 0 when it is successful. Otherwise the exit status is that of the last sg_readcap utility called. See the
sg3_utils(8) man page.
AUTHORS
Written by D. Gilbert
COPYRIGHT
Copyright (C) 2009 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
POSE.
SEE ALSO
sg_readcap (sg3_utils)
sg3_utils-1.28 October 2009 SCSI_READCAP(8)