return the location of a binary by searching in $PATH

inpath.sh

#!/bin/bash

[[ -z $1 ]] && { echo "usage: inpath <filename>"; exit 1; }

for path in ${PATH//:/ }; do
  if [[ -e "$path/$1" ]]; then
    echo "$path/$1" && exit 0
  fi
done
echo "$1 not in \$PATH" && exit 1