This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding Linux
manual page for details of Linux behavior), or the interface may not be
implemented on Linux.
basename — return the last component of a pathname
char *basename(char *path);
The basename() function shall take the pathname pointed to by path
and return a pointer to the final component of the pathname, deleting any
trailing '/' characters.
If the string pointed to by path consists entirely of the
'/' character, basename() shall return a pointer to the string
"/". If the string pointed to by path is exactly
"//", it is implementation-defined whether '/' or
"//" is returned.
If path is a null pointer or points to an empty string,
basename() shall return a pointer to the string
The basename() function may modify the string pointed to by
path, and may return a pointer to internal storage. The returned
pointer might be invalidated or the storage might be overwritten by a
subsequent call to basename().
The basename() function need not be thread-safe.
The basename() function shall return a pointer to the final component of
No errors are defined.
The following sections are informative.
The following program fragment returns a pointer to the value lib, which
is the base name of /usr/lib.
In the following table, the input string is the value pointed to by path,
and the output string is the return value of the basename() function.
char *name = "/usr/lib";
base = basename(name);
The Base Definitions volume of POSIX.1‐2008,
The Shell and Utilities volume of POSIX.1‐2008,
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
7, Copyright (C) 2013 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013
Technical Corrigendum 1 applied.) In the event of any discrepancy between this
version and the original IEEE and The Open Group Standard, the original IEEE
and The Open Group Standard is the referee document. The original Standard can
be obtained online at http://www.unix.org/online.html .
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