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Full Discussion: while condition error:
Top Forums Shell Programming and Scripting while condition error: Post 302623421 by neutronscott on Friday 13th of April 2012 01:38:06 PM
Old 04-13-2012
you'd make that correct with

Code:
while [ "$(fdisk -l /dev/disk/by-path/*usb* | wc -w)" -eq 0 ]

but if you just want to see if something with *usb* exists, why run fdisk? the shell globs the path, so you can just check if it expands to existing files. which shell?
 

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usb-devices(1)							Linux USB Utilities						    usb-devices(1)

NAME
usb-devices - print USB device details SYNOPSIS
usb-devices DESCRIPTION
usb-devices is a (bash) shell script that can be used to display details of USB buses in the system and the devices connected to them. The output of the script is similar to the usb/devices file available either under /proc/bus (if usbfs is mounted), or under /sys/ker- nel/debug (if debugfs is mounted there). The script is primarily intended to be used if the file is not available. In contrast to the usb/devices file, this script only lists active interfaces (those marked with a "*" in the usb/devices file) and their endpoints. Be advised that there can be differences in the way information is sorted, as well as in the format of the output. RETURN VALUE
If sysfs is not mounted, a non-zero exit code is returned. FILES
/sys/bus/usb/devices/usb* The part of the sysfs tree the script walks through to assemble the printed information. /proc/bus/usb/devices Location where the usb/devices file can normally be found for Linux kernels before 2.6.31, if usbfs is mounted. /sys/kernel/debug/usb/devices Location where the usb/devices file can normally be found for Linux kernel 2.6.31 and later, if debugfs is mounted. SEE ALSO
lsusb(8), usbview(8). AUTHORS
Greg Kroah-Hartman <greg@kroah.com> Randy Dunlap <rdunlap@xenotime.net> Frans Pop <elendil@planet.nl> usbutils-005 23 June 2009 usb-devices(1)
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