Fdisk and grep command not working in udev trigger

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dpkg-trigger

dpkg-trigger(1) 						    dpkg suite							   dpkg-trigger(1)

NAME

       dpkg-trigger - a package trigger utility

SYNOPSIS

       dpkg-trigger [option...] trigger-name
       dpkg-trigger [option...] command

DESCRIPTION

       dpkg-trigger is a tool to explicitly activate triggers and check for its support on the running dpkg.

       This  can be used by maintainer scripts in complex and conditional situations where the file triggers, or the declarative activate triggers
       control file directive, are insufficiently rich. It can also be used for testing and by system administrators (but note that  the  triggers
       won't actually be run by dpkg-trigger).

       Unrecognized trigger name syntaxes are an error for dpkg-trigger.

COMMANDS

       --check-supported
	      Check  if  the running dpkg supports triggers (usually called from a postinst). Will exit 0 if a triggers-capable dpkg has run, or 1
	      with an error message to stderr if not. Normally, however, it is better just to activate the desired trigger with dpkg-trigger.

       -?, --help
	      Show the usage message and exit.

       --version
	      Show the version and exit.

OPTIONS

       --admindir=dir
	      Change the location of the dpkg database. The default location is /var/lib/dpkg.

       --by-package=package
	      Override trigger awaiter (normally set by dpkg through the DPKG_MAINTSCRIPT_PACKAGE environment variable of the maintainer  scripts,
	      naming the package to which the script belongs, and this will be used by default).

       --no-await
	      This option arranges that the calling package T (if any) need not await the processing of this trigger; the interested package(s) I,
	      will not be added to T's trigger processing awaited list and T's status is unchanged.  T may be considered installed even  though  I
	      may not yet have processed the trigger.

       --await
	      This option does the inverse of --no-await (since dpkg 1.17.21).	It is currently the default behavior.

       --no-act
	      Just test, do not actually change anything.

EXIT STATUS

       0      The requested action was successfully performed.	Or a check or assertion command returned true.

       1      A check or assertion command returned false.

       2      Fatal  or  unrecoverable error due to invalid command-line usage, or interactions with the system, such as accesses to the database,
	      memory allocations, etc.

ENVIRONMENT

       DPKG_ADMINDIR
	      If set and the --admindir option has not been specified, it will be used as the dpkg data directory.

SEE ALSO

       dpkg(1), deb-triggers(5), /usr/share/doc/dpkg-dev/triggers.txt.gz.

1.19.0.5							    2018-04-16							   dpkg-trigger(1)

Shell Programming and Scripting