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/* which.c - Find executable files in $PATH.
* Copyright 2006 Rob landley <>
config WHICH
bool "which"
default y
usage: which [-a] filename ...
Search $PATH for executable files matching filename(s).
-a Show all matches
#include "toys.h"
// Find an exectuable file either at a path with a slash in it (absolute or
// relative to current directory), or in $PATH. Returns absolute path to file,
// or NULL if not found.
static int which_in_path(char *filename)
struct string_list *list;
// If they gave us a path, don't worry about $PATH or -a
if (strchr(filename, '/')) {
// Confirm it has the executable bit set, and it's not a directory.
if (!access(filename, X_OK)) {
struct stat st;
if (!stat(filename, &st) && S_ISREG(st.st_mode)) {
return 0;
return 1;
// Search $PATH for matches.
list = find_in_path(getenv("PATH"), filename);
if (!list) return 1;
// Print out matches
while (list) {
if (!access(list->str, X_OK)) {
// If we should stop at one match, do so
if (!toys.optflags) {
llist_traverse(list, free);
return 0;
void which_main(void)
int i;
for (i=0; toys.optargs[i]; i++)
toys.exitval |= which_in_path(toys.optargs[i]);