First of all, some of the commands are used to make
archives - ie. a file that contain other files, often with directory-structure, ownership, permissions and dates. The most common of these are
ar (used when creating libraries),
tar (TapeARchive) and
Then we have some commands that are used to
compress files - ie. making the file take-up less space on the disk. Compressing can also be done to archives. The most common compression-programs are
7zip... as well as the two older ones,
This is very much in accordance to the "Unix-philosophy", where each command does only one thing (but does it well)... here, either creates archives or compress a file - but not both. Of course one command may call another, as
tar may call
For Windows it's more common to make programs that combine related tasks - or rather, for the user seemingly related tasks... Like making and archive and compressing it - even though these are very different tasks. Consequently we also have some tools under Unix/Linux to handle - and sometimes create - such archives.
arj are examples of such archives, that are more or less supported under Linux. These typically do both compressing and archiving at once (e.g.
zip first compress the files, then makes an archive of the compressed files).
zip do AFAIK know support some sort of "encryption" and password, but these are rather poor. You probably would be better off (as well as more correctly Unix-wise) to use a separate tool for encrypting and/or password-protecting the files - perhaps
tar support creation of archives of multiple parts. However an other acceptable "Unix-way" to do it; would be to use
split either on the uncompressed archive (tar or cpio) and compress each part separately, or on the compressed (eg. with bzip2) file - and later using
cat to merge the parts. Splitting the compressed archive would perhaps be best, as after re-merging, the compress-program (eg. bzip2) would detect any errors. Although compressing each part individually, would ensure that the other parts could be recovered (with most of their files) if one part was damaged.