Section (1) basename
basename — strip directory and suffix from filenames
Print NAME with any leading directory components removed. If specified, also remove a trailing SUFFIX.
Mandatory arguments to long options are mandatory for short options too.
support multiple arguments and treat each as a NAME
remove a trailing SUFFIX; implies
end each output line with NUL, not newline
display this help and exit
output version information and exit
basename include/stdio.h .h
basename −s .h include/stdio.h
basename −a any/str1 any/str2
−> str1 followed by str2
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
Full documentation <https://www.gnu.org/software/coreutils/basename>
or available locally via: info _zsingle_quotesz_(coreutils) basename invocation_zsingle_quotesz_
Copyright © 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
Section (3) basename
basename, dirname — parse pathname components
There are two different functions
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 _zsingle_quotesz_/_zsingle_quotesz_, and
basename() returns the component following
the final _zsingle_quotesz_/_zsingle_quotesz_. Trailing _zsingle_quotesz_/_zsingle_quotesz_ characters are not counted as
part of the pathname.
path does not
contain a slash,
returns the string . while
basename() returns a copy of
path is the string /, then
basename() return the string /. If
path is a null
pointer or points to an empty string, then both
basename() return the string ..
Concatenating the string returned by
dirname(), a /, and the string returned
basename() yields a complete
basename() may modify the
it may be desirable to pass a copy when calling one of these
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
path, so that the
string referred to by
path should not be modified or
freed until the pointer returned by the function is no longer
The following list of examples (taken from SUSv2) shows
the strings returned by
basename() for different paths:
path dirname basename /usr/lib /usr lib /usr/ / usr usr . usr / / / . . . .. . ..
basename() return pointers to
null-terminated strings. (Do not pass these pointers to
For an explanation of the terms used in this section, see attributes(7).
There 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) */ #include <string.h>
The GNU version never modifies its argument, and returns
the empty string when
path has a trailing slash, and
in particular also when it is /. There is no GNU version of
With glibc, one gets the POSIX version of
is included, and the GNU version otherwise.
In the glibc implementation, the POSIX versions of these
functions modify the
path argument, and segfault
when called with a static string such as /usr/.
Before glibc 2.2.1, the glibc version of
dirname() did not correctly handle
pathnames with trailing _zsingle_quotesz_/_zsingle_quotesz_ characters, and generated a
segfault if given a NULL argument.
The following code snippet demonstrates the use of
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 , dname, bname);
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Created, 14 Dec 2000 by Michael Kerrisk