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Top Forums Shell Programming and Scripting getting full path from relative path Post 302110723 by polypus on Wednesday 14th of March 2007 08:56:09 PM
Old 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
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