\nCrack open open the champagne:\nBatch File Week is finally over!\n<\/p>\n
\nVariations on the\n \nFor your fancy recursive file operations,\nthere’s a tool called\n \nUnfortuantely, the \nYou can type \nIf the command you want to execute is rather long,\nyou can offload it back into the batch file being executed:\n<\/p>\n \nOne gotcha here is that since each command runs in a sub-shell,\nit can read environment variables, but any modifications it makes\nto environment variables will be lost since the command is modifying\nonly its local environment variables.\nA workaround for this is to use for \/f %%i in ('dir \/b ...')<\/code>\nwill let you repeat an operation on the contents of a directory,\npossibly even recursively if you add the \/s<\/code> option,\nwith some basic attribute-level filtering if you add the\n\/a<\/code> or <\/code>\/a-<\/code> flags.\n<\/p>\nFORFILES<\/code> which iterates through the contents of a\ndirectory (recursively if requested),\nexecuting a command on each item it finds.\nIt also has additional filtering capability,\nlike selecting files based on their last-modified time.\nFor example,\nyou could copy all files in the current directory which were\nmodified today:\n<\/p>\n\nforfiles \/D +0 \/c \"cmd \/c copy @file \\\\server\\today\"\n<\/pre>\n
\/D<\/code> option is not as flexible\nas one might like.\nFor example, while it can pick files modified today,\nit can’t pick files modified in the last week,\nbecause the relative-date-picker knows only how to pick\nfiles modified on or before a date in the past<\/i>\nor\nfiles modified on or after a date in the future<\/i>.\n(Who the heck wants to operate on files modified in the future?\nExcept perhaps the Microsoft Research folks who are working\non that time machine.)\n<\/p>\nFORFILES \/?<\/code> for more information on what\nyou can do (and by seeing what’s omitted, what you can’t do).\n<\/p>\n\n@echo off\nif \"%1\"==\"\/callback\" goto callback\nforfiles \/D +0 \/c \"cmd \/c call \"%~f0\" \/callback @isdir @file @fsize\"\ngoto :eof\n:callback\nrem %2 = @isdir\nrem %3 = @file\nrem %4 = @fsize\nif %2==TRUE echo Skipping directory %3.&goto :eof\necho Copying file %3 to \\\\server\\today (%4 bytes)\n<\/pre>\n
FORFILES<\/code> to select\nthe data to operate on,\nbut use FOR<\/code> to actually perform the operation.\nSince FOR<\/code> runs inside the main command interpreter,\nit can modify environment variables.\n<\/p>\n\nset TOTALSIZE=0\nfor \/f %%i in ('forfiles \/d +0 \/c \"cmd \/c if @isdir==FALSE echo @fsize\"') ^<\/a>\ndo set \/a TOTALSIZE=TOTALSIZE + %%i\n<\/pre>\n