index(3)

💖 index — bestie we need to talk 💖

okay so real talk, this one's a legacy page, she's giving vintage, she's giving 4.3BSD, and she is deprecated so like… read it for the lore but don't build your whole personality on it, mwah 🎀

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✨ NAME ✨

index, rindex — string search character 👀

📚 LIBRARY 📚

Standard C library (libc, -lc) 🫶

🌸 SYNOPSIS 🌸

#include <strings.h>

[[deprecated]] char *index(const char *s, int c);
[[deprecated]] char *rindex(const char *s, int c);

the [[deprecated]] is RIGHT THERE bestie, it's literally screaming at you, do not ignore her 💀

🦋 DESCRIPTION 🦋

okay so index()? literally the same thing as strchr(3). identical. twins. not a single difference. so please just go use the latter instead, the vibes are better over there ✨

and rindex()? same situation, she is literally strrchr(3). identical, no cap. use the latter instead, that's the whole assignment 🫶

⭐ STANDARDS ⭐

None. that's it. nothing. the standard said no 💅 iconic of her honestly

👑 HISTORY 👑

• 4.3BSD — where she was born, main character origin story 🌈
• marked as LEGACY in POSIX.1-2001 😭
• removed in POSIX.1-2008 💀

so yeah she got retired, we still love her, we just don't call her anymore 💜

🎀 SEE ALSO 🎀

• strchr(3)
• strrchr(3)

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and that's the whole page bestie — this was index(3) from the Library Functions Manual, brought to you by Linux man-pages 6.20, dated 2026-08-10. go use strchr and strrchr, hydrate, and slay responsibly 🧚💖✨