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Full Discussion: $dirname ??????
Top Forums UNIX for Dummies Questions & Answers $dirname ?????? Post 302555284 by pludi on Wednesday 14th of September 2011 10:18:26 AM
Old 09-14-2011
$0 is the path and name of the current running script. So if you called it as /full/path/to/app it's that, and if you called it as ./app, it's only that.
Now the first (inner) dirname removes the name of the application, so it's only /full/path/to or . anymore.
With the second dirname, you're shortening it even more, becoming /full/path and . respectively.

What you probably need is a simple MYAPPDIR=$( pwd )
 

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DIRNAME(3)						   BSD Library Functions Manual 						DIRNAME(3)

NAME
dirname -- report the parent directory name of a file pathname LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <libgen.h> char * dirname(char *path); DESCRIPTION
The dirname() function takes a pointer to a character string that contains a pathname, path, and returns a pointer to a string that is a pathname of the parent directory of path. Trailing '/' characters in path are not counted as part of the path. If path does not contain a '/', then dirname() returns a pointer to the string ``.''. If path is a null pointer or points to an empty string, dirname() returns a pointer to the string ``.''. RETURN VALUES
The dirname() function returns a pointer to a string that is the parent directory of path. SEE ALSO
dirname(1), basename(3) STANDARDS
o X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'') o IEEE Std 1003.1-2001 (``POSIX.1'') BUGS
If the length of the result is longer than PATH_MAX bytes (including the terminating nul), the result will be truncated. The dirname() function returns a pointer to static storage that may be overwritten by subsequent calls to dirname(). This is not strictly a bug; it is explicitly allowed by IEEE Std 1003.1-2001 (``POSIX.1''). BSD
May 10, 2008 BSD
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