nextbin


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#!/bin/sh

orig_exe=$(realpath -s "$1")
exe_name=${orig_exe##*/}
case "$orig_exe" in
    */*) ;;
    *)
        printf 'error: cannot find next executable: argv[0] is %s, missing /\n' "$orig_exe"
        exit 1
esac
paths=
passed_paths=
set -f
_IFS=$IFS
IFS=:
for path in $PATH; do
    file=$path/$exe_name
    if [ "$file" = "$orig_exe" ]; then
        if [ -n "$passed_paths" ] && [ -n "$paths" ]; then
            printf 'error: ambiguous next executable for %s past %s, due to multiple non-consecutive instances of %s in PATH' "$exe_name" "$orig_exe" "$(dirname "$orig_exe")"
            exit 1
        fi
        passed_paths=${paths+$paths:}
        paths=
    else
        paths="${paths+$paths:}$path"
    fi
done
IFS=$_IFS
PATH="$passed_paths$paths" exec "$exe_name"
exit 1