In older versions RAR for Windows could not use them for Unix RAR archives also as RAR for Unix for Windows RAR archives.
Switches -ed and -e+d can be used in archive processing commands for any combination of RAR and archive operating systems.For example, if we set RAR environment variable to -agfYYYY-MMM-DD, we can use -ag without a parameter with YYYY-MMM-DD format string assumed. It has a practical value only if placed to rar.ini configuration file or to RAR environment variable. Command line -agf switch specifies the default format string for -ag switch.Previously this rar.ini format was supported only by console RAR. Some switches can be applicable both in shell and in command line modes. For example: switches=-m5 -s switches_x=-o+ Most of switches specified in rar.ini are used only in the command line mode.First applies switches to all and second to individual commands.This file includes strings in following format: WinRAR can read default values of command line switches from rar.ini text file, which can be stored either in the same folder as WinRAR.exe or in %APPDATA%\WinRAR folder.For example, we can use -tscap instead -tsc -tsa -tsp. It is allowed to combine several modifiers in the same -ts switch.It can be combined with other -ts switches, like: rar a -tsc -tsp arcname files Command line -tsp switch can be used to preserve the original last access time of archiving files."Preserve source files last access time" option on "Time" page of archiving dialog permits to preserve the original last access time of archiving files.
Authenticity information may be added for additional security and RAR will store information on the last update and name of the archive. Even physically damaged archives may be repaired and an archive may be locked to prevent further changes.
RAR offers the ability to create and change SFX archives using default and external SFX modules.RAR provides functionality for creating a 'solid' archive, which can raise the compression ratio by 10% - 50% over more common methods, particularly when packing large numbers of small files.
RAR offers an optional compression algorithm highly optimized for multimedia data.
It allows higher compression ratios than other PC archiving tools, especially on executable files, object libraries, large text files, etc. RAR introduces an original compression algorithm.The archive is usually a regular file, which name has a ".rar" suffix. Allows you to manage and control archive files.