From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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As @mieum mentioned, FreeBSD does not ship with
zsh
by default. The user chooses their preferred shell when setting up:csh
,tcsh
, andsh
are the options.Also, there are several distinct versions of
ksh
. Adding which version (of each shell) you tried would be helpful as well.