#! /bin/sh

if [ $# -eq 0 ]
then
    cmd=$(basename $0)
    echo $cmd: search all Bourne shell scripts for a command
    echo usage: $cmd [grep-options] command-to-grep-for
    echo the grep-option -l is useful
    exit 1
fi

(
IFS=:
for d in $PATH
do
    file $d/*
done
find /etc/rc.d -type f | xargs file
file $HOME/bin/*
) \
| grep 'Bourne.* shell script' \
| awk -F: '{print $1}' \
| xargs grep "$@"