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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)								   User Commands							    pwd(1)

NAME
pwd - return working directory name SYNOPSIS
/usr/bin/pwd DESCRIPTION
The pwd utility writes an absolute path name of the current working directory to standard output. Both the Bourne shell, sh(1), and the Korn shell, ksh(1), also have a built-in pwd command. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of pwd: LANG, LC_ALL, LC_MESSAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. If an error is detected, output will not be written to standard output, a diagnostic message will be written to standard error, and the exit status will not be 0. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
cd(1), ksh(1), sh(1), shell_builtins(1), attributes(5), environ(5), standards(5) DIAGNOSTICS
``Cannot open ..'' and ``Read error in ..'' indicate possible file system trouble and should be referred to a UNIX system administrator. NOTES
If you move the current directory or one above it, pwd may not give the correct response. Use the cd(1) command with a full path name to correct this situation. SunOS 5.10 28 Mar 1995 pwd(1)
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