03-14-2007
getting full path from relative path
given a relative path, how do i convert it into a full one. i.e. if i am in
/home/polypus
and i am given foo/bar then to get a full path i can just concatinate it with pwd, but what if i am given "../mama"
how do i programmatically convert:
/home/polypus and ../mama into /home/mama
in a way that will always work no matter what relative path is passed?
my first thought is to just cd to the directory and set a variable
cd $rev_path
full_path=`pwd`
cd $original_dir
it seems there must be a unix command which does this more elegantly?
thanks
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PWD(1) BSD General Commands Manual PWD(1)
NAME
pwd -- return working directory name
SYNOPSIS
pwd [-LP]
DESCRIPTION
pwd writes the absolute pathname of the current working directory to the standard output.
The following options are available:
-L If the PWD environment variable is an absolute pathname that contains neither "/./" nor "/../" and references the current directory,
then PWD is assumed to be the name of the current directory.
-P Print the physical path to the current working directory, with symbolic links in the path resolved.
The default for the pwd command is -P.
pwd is usually provided as a shell builtin (which may have a different default).
EXIT STATUS
The pwd utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
cd(1), csh(1), ksh(1), sh(1), getcwd(3)
STANDARDS
The pwd utility is expected to be conforming to IEEE Std 1003.1 (``POSIX.1''), except that the default is -P not -L.
BUGS
In csh(1) the command dirs is always faster (although it can give a different answer in the rare case that the current directory or a con-
taining directory was moved after the shell descended into it).
pwd -L relies on the file system having unique inode numbers. If this is not true (e.g., on FAT file systems) then pwd -L may fail to detect
that PWD is incorrect.
BSD
October 30, 2003 BSD