vlt.file.searchreplacefiles_shell
SEARCHREPLACEFILES_SHELL - search and replace text in all files in a directory search
vlt.file.searchreplacefiles_shell(DIRSEARCH, FINDSTRING, REPLACESTRING)
Searches all of the files in the string DIRSEARCH (examples: '*.m',
or '*/*.m') for occurrances of the string FINDSTRING and replaces those
strings with REPLACESTRING.
At present, this requires unix (it calls the shell commands 'find' and 'sed').
The function prints its shell command before attempting to run.