index(3) - BetterMan

index(3)

locate character in string

distropkg manpages-dev@6.9.1-1dataset 2026-04-01T06:19:02Z+debian+ec4110e+mandoc:1.14.6-4

Synopsis

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

—

NAME

index, rindex - locate character in string

Standard C library (libc, -lc)

bash

#include <strings.h>

bash

[[deprecated]] char *index(const char *\ns\n, int \nc\n);\n
\n[[deprecated]] char *rindex(const char *\ns\n, int \nc\n);

index() is identical to strchr(3).

rindex() is identical to strrchr(3).

Use strchr(3) and strrchr(3) instead of these functions.

None.

4.3BSD; marked as LEGACY in POSIX.1-2001. Removed in POSIX.1-2008, recommending strchr(3) and strrchr(3) instead.