Movatterモバイル変換

basename(3p) — Linux manual page

BASENAME(3P)            POSIX Programmer's ManualBASENAME(3P)

PROLOG        top

       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.

NAME        top

       basename — return the last component of a pathname

SYNOPSIS        top

       #include <libgen.h>       char *basename(char *path);

DESCRIPTION        top

       Thebasename() function shall take the pathname pointed to bypath       and return a pointer to the final component of the pathname,       deleting any trailing'/'characters.       If the string pointed to bypath consists entirely of the'/'       character,basename() shall return a pointer to the string"/".       If the string pointed to bypath is exactly"//", it is       implementation-defined whether'/'or"//"is returned.       Ifpath is a null pointer or points to an empty string,basename()       shall return a pointer to the string".".       Thebasename() function may modify the string pointed to bypath,       and may return a pointer to internal storage. The returned pointer       might be invalidated or the storage might be overwritten by a       subsequent call tobasename().  The returned pointer might also be       invalidated if the calling thread is terminated.       Thebasename() function need not be thread-safe.

RETURN VALUE        top

       Thebasename() function shall return a pointer to the final       component ofpath.

ERRORS        top

       No errors are defined.The following sections are informative.

EXAMPLES        top

Using basename()       The following program fragment returns a pointer to the valuelib,       which is the base name of/usr/lib.           #include <libgen.h>           ...           char name[] = "/usr/lib";           char *base;           base = basename(name);           ...Sample Input and Output Strings for the basename() and dirname()Functions and the basename and dirname Utilities       .TS┌───────────────┬───────────┬────────────┬──────────────┬─────────────────┬───────────┐│basename()│           │            │basename│Output│Output││and dirname()│String│String│and dirname│Written by│Written by││Functions path│Returned by│Returned by│Utilities│basename│dirname││Argument│basename()│dirname()│string Operand│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" %%%SH%%% None.

RATIONALE        top

       None.

FUTURE DIRECTIONS        top

       None.

SEE ALSO        top

dirname(3p)       The Base Definitions volume of POSIX.1‐2017,libgen.h(0p)       The Shell and Utilities volume of POSIX.1‐2017,basename(1p)

COPYRIGHT        top

       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 athttp://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, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017BASENAME(3P)

Pages that refer to this page:libgen.h(0p), basename(1p), dirname(1p), dirname(3p)

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.