This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  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.opengroup.org/unix/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                      BASENAME(3POSIX)

       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 returned pointer might also be invalidated if the calling thread is terminated.

       The basename() function need not be thread-safe.

       No errors are defined.

       Thefollowingsectionsareinformative.

Usingbasename()
       The following program fragment returns a pointer to the value lib, which is the base name of /usr/lib.

           #include <libgen.h>
           ...
           char name[] = "/usr/lib";
           char *base;

           base = basename(name);
           ...

   SampleInputandOutputStringsforthebasename()anddirname()FunctionsandthebasenameanddirnameUtilities
       .TS
               ┌───────────────┬───────────┬────────────┬──────────────┬─────────────────┬───────────┐
               │   basename()  │           │            │   basename   │     Output      │  Output   │
               │ anddirname() │  String   │   String   │ anddirname  │   Writtenby    │Writtenby │
               │ Functionspath│Returnedby│Returnedby │  Utilities   │    basename     │ dirname   │
               │    Argument   │basename() │ dirname()  │stringOperand│     Utility     │ Utility   │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "usr"         │"usr"      │"."         │usr           │usr              │.          │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "usr/"        │"usr"      │"."         │usr/          │usr              │.          │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ ""            │"."        │"."         │""            │. or empty string│.          │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "/"           │"/"        │"/"         │/             │/                │/          │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "//"          │"/" or "//"│"/" or "//" │//            │/ or //          │/ or //    │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "///"         │"/"        │"/"         │///           │/                │/          │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "/usr/"       │"usr"      │"/"         │/usr/         │usr              │/          │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "/usr/lib"    │"lib"      │"/usr"      │/usr/lib      │lib              │/usr       │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "//usr//lib//"│"lib"      │"//usr"     │//usr//lib//  │lib              │//usr      │
               ├───────────────┼───────────┼────────────┼──────────────┼─────────────────┼───────────┤
               │ "/home//dwc// │"test"     │"/home//dwc"│/home//dwc//  │test             │/home//dwc │
               │ test"         │           │            │test          │                 │           │
               └───────────────┴───────────┴────────────┴──────────────┴─────────────────┴───────────┘
       .SH "APPLICATION USAGE" None.

       None.

       basename — return the last component of a pathname

       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.

       None.

       The basename() function shall return a pointer to the final component of path.

dirname()

       The Base Definitions volume of POSIX.1‐2017, <libgen.h>

       The Shell and Utilities volume of POSIX.1‐2017, basename

       #include <libgen.h>

       char *basename(char *path);