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- The various .diff files in this directory are produced by the
- Unix `diff' program, and contain the differences between two versions
- of a package (e.g. gcc-2.6.2-2.6.3.diff can be used to upgrade gcc
- 2.6.2 to version 2.6.3).
-
- You can use the `patch' program, available here, to
- automatically apply diff files to sources.
- ----------------------------------------------------------------------
- Because the `compress' utility is covered by patents (US 4,464,650 and
- 4,558,302), we cannot use it; it is not free software.
-
- Instead, the GNU Project uses the `gzip' program, which is free of
- known software patents and also compresses better than `compress'.
- Files compressed with this method end with `.gz'.
-
- Gzip can also uncompress files compressed with `compress' (i.e. files
- ending in `.Z'), since the uncompression algorithm is not patented.
-
- To extract sources that are in files ending in `.tar.gz' you can use
- the command
-
- gzip -d < foo.tar.gz | tar xf -
-
- where `foo.tar.gz' is the name of the file.
-
- Gzip is available in source form on this ftp archive, in the files
- gzip-N.N.shar and gzip-N.N.tar (where N.N is the version number - e.g.
- 1.2.4).
-
- The file gzip-N.N.tar.gz is also available for those who
- already have gzip but want to get a newer version, since the gzipped
- file will transfer faster).
-
- Gzip is also available as a DOS executable in the file
- gzip-N.N.msdos.exe. To find a VMS executable, read gzip-vms.README.
-