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realpath(1) [debian man page]

REALPATH(1)							      Debian							       REALPATH(1)

NAME

       realpath - return the canonicalised absolute pathname

SYNOPSIS

       realpath [-s|--strip] [-z|--zero]  filename  ...
       realpath --h|--help
       realpath --v|--version

DESCRIPTION

       realpath  converts  each filename argument to an absolute pathname, which has no components that are symbolic links or the special .  or ..
       directory entries.  (See realpath(3) for more information.)
       Each path component in the filename must exist, otherwise realpath will fail and non-zero exit status will be returned.
       Please note that mostly the same functionality is provided by the `-e'  option of the readlink(1) command.

       When the -s option is used realpath only removes the .  and ..  directories, but not symbolic links from filename.  If the  given  filename
       argument  is relative (i.e.  does not start with `/'), realpath -s prepends to it the current directory name as obtained from the getcwd(2)
       system call before further processing.

       Each converted pathname is output to the standard output, on its own line.

OPTIONS

       -s, --strip
	    Only strip .  and .., components, but do not resolve symbolic links.

       -z, --zero
	    Separate output filenames with the null character instead of newline, so it can be used with the `-0' option of xargs(1).

       -h, --help
	    Print short usage information.

       -v, --version
	    Show realpath's version number.

EXAMPLES

       For the examples below let's suppose that /usr/bin/X11 is a symbolic link, pointing to directory /usr/bin.

   Example 1
       Regardless of what the current directory is
	   realpath /../usr/bin/X11/./xterm
       prints
	   /usr/bin/xterm
       but
	   realpath -s /../usr/bin/X11/./xterm
       outputs
	   /usr/bin/X11/xterm

   Example 2
       When the current directory is /usr/bin/X11 (which is still a symbolic link to /usr/bin), the output of both
	   realpath ./xterm
       and
	   realpath  -s ./xterm
       will be
	   /usr/bin/xterm

   Example 3
       Providing that the current directory is /home/user (and the directory exists before and during the realpath run), the  command
	   realpath ../path/to/some/./non-existent/./directory/../or/../file
       will fail with the following error
	   ../path/to/some/./non-existent/./directory/../or/../file: No such file or directory
       but
	   realpath -s ../path/to/some/./non-existent/./directory/../or/../file
       will return
	   /home/path/to/some/non-existent/file

EXIT STATUS

       realpath returns a zero exit code when all pathnames were successfully converted.
       In case of any errors (e.g. missing or unavailable directories in the path), realpath prints error message to stderr and returns a non-zero
       exit code.

SEE ALSO

       basename(1), dirname(1), readlink(1), chase(1), realpath(3)

BUGS

       Hopefully none :)
       If  you	find  some, please report them via the normal Debian bug reporting system, see the file /usr/share/doc/debian/bug-reporting.txt in
       the package doc-debian or the reportbug(1) man page.

AUTHOR

       Originally written by Lars Wirzenius <liw@iki.fi>, as a part of the dwww package.  Robert Luberda <robert@debian.org>  currently  maintains
       and extends it.

       realpath  is  licensed  via  the GNU General Public License.  While it has been written for Debian, porting it to other systems is strongly
       encouraged.

Debian								October 16th, 2011						       REALPATH(1)

Check Out this Related Man Page

realpath(3C)						   Standard C Library Functions 					      realpath(3C)

NAME

       realpath - resolve pathname

SYNOPSIS

       #include <stdlib.h>

       char *realpath(const char *restrict file_name, char *restrict resolved_name);

DESCRIPTION

       The realpath() function derives, from the pathname pointed to by file_name, an absolute pathname that names the same file, whose resolution
       does not involve ".", "..", or symbolic links. The generated pathname is stored as a null-terminated string, up to a maximum of	{PATH_MAX}
       bytes (defined in limits.h(3HEAD)), in the buffer pointed to by resolved_name.

RETURN VALUES

       On  successful  completion, realpath() returns a pointer to the resolved name.  Otherwise, realpath() returns a null pointer and sets errno
       to indicate the error, and the contents of the buffer pointed to by resolved_name are left in an indeterminate state.

ERRORS

       The realpath() function will fail if:

       EACCES	       Read or search permission was denied for a component of file_name.

       EINVAL	       Either the file_name or resolved_name argument is a null pointer.

       EIO	       An error occurred while reading from the file system.

       ELOOP	       Too many symbolic links were encountered in resolving file_name.

       ELOOP	       A loop exists in symbolic links encountered during resolution of the file_name argument.

       ENAMETOOLONG    The file_name argument is longer than {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

       ENOENT	       A component of file_name does not name an existing file or file_name points to an empty string.

       ENOTDIR	       A component of the path prefix is not a directory.

       The realpath() function may fail if:

       ENAMETOOLONG    Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}.

       ENOMEM	       Insufficient storage space is available.

USAGE

       The realpath() function operates on null-terminated strings.

       Execute permission is required for all the directories in the given and the resolved path.

       The realpath() function might fail to return to the current directory if an error occurs.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getcwd(3C), limits.h(3HEAD), sysconf(3C), attributes(5), standards(5)

SunOS 5.10							    9 Oct 2003							      realpath(3C)
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