- [ -n "$1" ] || { echo "Error: missing argument to checkbootparam()" ; return 1 }
- # make sure we match beginning and end of line as well
- # but don't match 'vg' if we want to check for 'vga'
- if echo "$CMDLINE" | grep -qw "$1" ; then
- return 0
- else
- return 1
- fi
+ [ -n "$1" ] || ( echo "Error: missing argument to checkbootparam()" ; return 1 )
+ local line
+ local ws
+ ws=' '
+ line=" $CMDLINE "
+ case "$line" in
+ *[${ws}]"$1"=*|*[${ws}]"$1"[${ws}]*)
+ return 0 ;;
+ *)
+ return 1 ;;
+ esac