In the Unix design, one tries to avoid creating a Swiss Army knife; instead, one creates a tool for a very specific, designated purpose and for that one purpose only. No ifs, no buts; no cruft, no clutter. This is design simplicity at its best.
"Simplicity is the ultimate sophistication."
- Leonardo da Vinci
Take a common example: when working on the Linux CLI (command-line interface), you would like to figure out which of your locally mounted filesystems has the most available (disk) space.
We can get the list of locally mounted filesystems by an appropriate switch (just df would do as well):
$ df --localFilesystem 1K-blocks Used Available Use% Mounted onrootfs 20640636 1155492 18436728 6% /udev 10240 0 10240 0% /dev ...
