binfind - Search for executable files based from PATH variable.

#!/bin/bash

shopt -s extglob

function main {
	# check bash version

	[[ BASH_VERSINFO -ge 3 ]] || {
		echo "This script requires bash version 3.0 or newer."
		return 1
	}

	# check arguments

	[[ $# -eq 0 || "$1" == "-h" || "$1" == "--help" ]] && {
		echo "usage: binfind <partstring> [partstring2, ...]"
		return 1
	}

	# prepare patterns

	local A
	local -a IPATTERNS=(-iname "*$1*")

	for A in "${@:2}"; do
		IPATTERNS=("${IPATTERNS[@]}" -and -iname "*$A*")
	done

	# prepare paths

	local IFS=:
	read -r -a PATHS <<< "$PATH"

	# make list unique

	local -a T=("${!PATHS[@]}")
	local -i I=0 J C=${#T[@]} D=0
	for (( ; I < C; ++I )); do
		for (( J = I + 1; J < C; ++J )); do
			[[ ${PATHS[T[I]]} = "${PATHS[T[J]]}" ]] && {
				unset PATHS\[T\[J\]\] T\[J\]
				(( ++D ))
			}
		done
		[[ D -gt 0 ]] && {
			T=("${T[@]:I + 1}")
			(( C -= D + I + 1, I = -1, D = 0 ))
		}
	done

	# remove unusable entries

	for I in "${!PATHS[@]}"; do
		[[ "${PATHS[I]}" == @(|+([[:blank:]])) ]] && unset 'PATHS[I]'
	done

	# find

	[[ ${#PATHS[@]} -gt 0 ]] && find "${PATHS[@]}" -maxdepth 1 -xtype f "${IPATTERNS[@]}" 2>/dev/null
}

main "$@"