Force decompression. bzip2, bunzip2 and bzcat are really the same program, and the decision about what actions to take is done on the basis of which name is used. This
flag overrides that mechanism, and forces bzip2 to decompress
As this says
bzcat are really the same binaries (oddly hardlinked binaries rather than symlinks to a single
bzip2 binary on my system). When the program is run it will check the name it was executed under and act appropriately.
bzip2 will compress by default, but
-d will make it decompress.
bunzip2 will decompress by default but
-z will make it compress.
bzcat will decompress to
stdout by default while the other invocations require the
-c option to output to
stdout rather than a file.
Is -c simply a way to force the output to standard output, and using bzip2 at invocation implying you want to compress data if you don't use -d?
So to answer simply - yes.