In the "depmod" section several command outputs assigned to
variables are missing backtics:

mtag=grep -l "$ktag" /lib/modules/*/.rhkmvtag 2> /dev/null

and

mver=echo $mtag | sed -e 's,/lib/modules/,,' -e
's,/.rhkmvtag,,' -e 's,[       ].*$,,'

This prevents the values from being assigned to the
variables.