Fish and zsh grew out of bash, which again was a free replacement of Bourne Shell — but from Bourne Shell there was another interesting development, namely rc[0

Fish and zsh grew out of bash, which again was a free replacement of Bourne Shell — but from Bourne Shell there was another interesting development, namely rc[0]. rc was developed at Bell Labs as the successor of Bourne shell. I usually prefer its syntax to the bash derivatives when scripting. It has a much cleaner feel to it. [0] http://plan9.bell-labs.com/sys/doc/rc.html http://plan9.bell-labs.com/sys/doc/rc.html