7z
A file archiver with highest compression ratio

Args:
a       add
d       delete
e       extract
l       list
t       test
u       update
x       extract with full paths

Example:
7z a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on archive.7z dir1

-t7z        7z archive
-m0=lzma    lzma method
-mx=9       level of compression = 9 (ultra)
-mfb=64     number of fast bytes for lzma = 64
-md=32m     dictionary size = 32 Mb
-ms=on      solid archive = on

7z exit codes:
0       normal (no errors or warnings)
1       warning (non-fatal errors)
2       fatal error
7       bad cli arguments
8       not enough memory for operation
255     process was interrupted