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Top Forums Shell Programming and Scripting Retrieve directory path from full file path through sh Post 302455301 by methyl on Tuesday 21st of September 2010 08:28:34 AM
Old 09-21-2010
Firstly the syntax with $(variable##pattern} and ${variable%%pattern) are in the "man" pages for Posix shells.

In your original post you used ${file##*/} to remove the leading path portion from ${file}. Here we are taking the result from that elimination and removing it from the end of ${file} to leave the path.
Code:
echo "${file%%${file##*/}}"

It could equally be done in two stages and been easier to read.
There will no doubt be a better method.


Forgot to mention. In day-to-day scripting I actually prefer "dirname" and "basename" because any scripter understands that method.
 

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BASENAME(1)						    BSD General Commands Manual 					       BASENAME(1)

NAME
basename, dirname -- return filename or directory portion of pathname SYNOPSIS
basename string [suffix] basename [-a] [-s suffix] string [...] dirname string DESCRIPTION
The basename utility deletes any prefix ending with the last slash '/' character present in string (after first stripping trailing slashes), and a suffix, if given. The suffix is not stripped if it is identical to the remaining characters in string. The resulting filename is written to the standard output. A non-existent suffix is ignored. If -a is specified, then every argument is treated as a string as if basename were invoked with just one argument. If -s is specified, then the suffix is taken as its argument, and all other arguments are treated as a string. The dirname utility deletes the filename portion, beginning with the last slash '/' character to the end of string (after first stripping trailing slashes), and writes the result to the standard output. EXAMPLES
The following line sets the shell variable FOO to /usr/bin. FOO=`dirname /usr/bin/trail` DIAGNOSTICS
The basename and dirname utilities exit 0 on success, and >0 if an error occurs. SEE ALSO
csh(1), sh(1) STANDARDS
The basename and dirname utilities are expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. BSD
April 18, 1994 BSD
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