macOS / binaries /

compress

/usr/bin/compress
–°ompress and expand data

The compress utility reduces the size of files using adaptive Lempel-Ziv coding. Each file is renamed to the same name plus the extension .Z. A file argument with a .Z extension will be ignored except it will cause an error exit after other arguments are processed. If compression would not reduce the size of a file, the file is ignored.

source: man