# help

Built-in commands:
-------------------
        . : [ [[ alias bg break cd chdir continue echo eval exec exit
        export false fg hash help jobs kill let local pwd read readonly
        return set shift source test times trap true type ulimit umask
        unalias unset wait

# echo $PATH
/usr/sbin:/bin:/usr/bin:/sbin
# export PATH=/usr/sbin:/bin:%builtin/usr/bin:/sbin
# echo $PATH
/usr/sbin:/bin:%builtin/usr/bin:/sbin
# hash
# kill
-sh: kill: Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or
kill -l [exitstatus]
# /bin/kill
BusyBox v1.2.1 (2008.01.31-08:47+0000) multi-call binary

Usage: kill [-signal] process-id [process-id ...]

Send a signal (default is SIGTERM) to the specified process(es).

Options:
        -l      List all signal names and numbers



Even after i specified %builtin in PATH after "/bin" entry, still the shell executed builtin kill command.