Manpage of BASENAME
BASENAMESection: Linux Programmer's Manual (3)
NAMEbasename, dirname - parse pathname components
#include <libgen.h>char *dirname(char *path);char *basename(char *path);
DESCRIPTIONWarning: there are two different functions basename() - see below.
The functions dirname() and basename() break a null-terminated pathname string into directory and filename components. In the usual case, dirname() returns the string up to, but not including, the final aq/aq, and basename() returns the component following the final aq/aq. Trailing aq/aq characters are not counted as part of the pathname.
If pathdoes not contain a slash, dirname() returns the string "." while basename() returns a copy of path. If pathis the string "/", then both dirname() and basename() return the string "/". If pathis a null pointer or points to an empty string, then both dirname() and basename() return the string ".".
Concatenating the string returned by dirname(), a "/", and the string returned by basename() yields a complete pathname.
Both dirname() and basename() may modify theof path, so it may be desirable to pass a copy when calling one of these functions.
These functions may return pointers to statically allocated memory which may be overwritten by subsequent calls. Alternatively, they may return a pointer to some part of path, so that the string referred to by pathshould not be modified or freed until the pointer returned by the function is no longer required.
The following list of examples (taken from SUSv2) shows the strings returned by dirname() and basename() for different paths:
path dirname basename /usr/lib /usr lib /usr/ / usr usr . usr / / / . . . .. . ..
RETURN VALUEBoth dirname() and basename() return pointers to null-terminated strings. (Do not pass these pointers to free(3).)
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|basename(), dirname()||Thread safety||MT-Safe|
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
NOTESThere are two different versions of basename() - the POSIX version described above, and the GNU version, which one gets after
#define _GNU_SOURCE /* See feature_test_macros(7) */The GNU version never modifies its argument, and returns the empty string when pathhas a trailing slash, and in particular also when it is "/". There is no GNU version of dirname().
With glibc, one gets the POSIX version of basename() when <libgen.h>is included, and the GNU version otherwise.
BUGSIn the glibc implementation of the POSIX versions of these functions they modify their argument, and segfault when called with a static string like "/usr/". Before glibc 2.2.1, the glibc version of dirname() did not correctly handle pathnames with trailing aq/aq characters, and generated a segfault if given a NULL argument.
char *dirc, *basec, *bname, *dname; char *path = "/etc/passwd"; dirc = strdup(path); basec = strdup(path); dname = dirname(dirc); bname = basename(basec); printf("dirname=%s, basename=%s\n", dname, bname);
SEE ALSObasename(1), dirname(1)
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Time: 22:27:56 GMT, June 20, 2016