<fizzie> ` echo -e \'#! /bin/bash\\ncmd="$1"\\nshift\\nf="$*"\\nif [ -z "$f" && "$f" == *\\\\ * ]; then f="${cmd#* }"; cmd="${cmd%% *}"; fi\\nif [ -z "$f" ]; then echo try: \\\\`f command filename; else "$cmd" "$(< "$f")"; fi\' > bin/f

Endomorphisms are just morphisms which compose with themselves.