.\" Copyright 2022 Alejandro Colomar .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" .TH index 3 2023-03-30 "Linux man-pages 6.04" .SH NAME index, rindex \- locate character in string .SH LIBRARY Standard C library .RI ( libc ", " \-lc ) .SH SYNOPSIS .nf .B #include .PP .BI "[[deprecated]] char *index(const char *" s ", int " c ); .BI "[[deprecated]] char *rindex(const char *" s ", int " c ); .fi .SH DESCRIPTION .BR index () is identical to .BR strchr (3). .PP .BR rindex () is identical to .BR strrchr (3). .PP Use .BR strchr (3) and .BR strrchr (3) instead of these functions. .SH STANDARDS None. .SH HISTORY 4.3BSD; marked as LEGACY in POSIX.1-2001. Removed in POSIX.1-2008, recommending .BR strchr (3) and .BR strrchr (3) instead. .SH SEE ALSO .BR strchr (3), .BR strrchr (3)