print( '-depsc', 'filename.eps');

-%%CreationDate: 06/29/2011  17:52:57
+%%CreationDate: 06/30/2011  19:18:03

# sed
sed -i file.eps '/^%%CreationDate: /d'

# grep
grep -v '^%%CreationDate: ' file.eps > tmp && mv tmp file.eps

# perl
perl -i -ne 'print if not /^%%CreationDate: /' file.eps

%# construct command, arguments and input filename (with quotes to escape spaces)
cmd = ['"' fullfile(matlabroot, 'sysperlwin32binperl.exe') '"'];
args = ' -i.bak -ne "print if not /^%%CreationDate: /" ';
fname = ['"' fullfile(pwd,'file.eps') '"'];

%# execute command
system([cmd args fname])