index(3) Library Functions Manual index(3)

index, rindex - string search character

Standard C library (libc-lc)

#include <strings.h>
[[deprecated]] char *index(const char *s, int c);
[[deprecated]] char *rindex(const char *s, int c);

index() is identical to strchr(3); user the latter instead.

rindex() is identical to strrchr(3); use the latter instead.

None.

4.3BSD; marked as LEGACY in POSIX.1-2001; removed in POSIX.1-2008.

strchr(3), strrchr(3)

2026-08-10 Linux man-pages 6.19