pif: переводы

→But that was the beginning of a revolution. The shell was just another program that
ran on Unix, if you didn’t like the standard one, you could create your own. So by
the end of Unix’s first decade, there were at least two competing shells: the Bourne
Shell, sh (which was a descendant of the original Thomson shell), plus the C Shell,
csh. By the end of Unix’s second decade, there were a few more alternatives: the
Korn shell, (ksh), and the first versions of the bash shell (bash). By the end of Unix’s
third decade, there were probably a dozen different shells.

→The Unix operating system popularized the notion of separating the shell (the part of
the system that lets you type commands) from everything else: the input/output system,
the scheduler, memory management, and all of the other things the operating
system takes care of for you (and that most users don’t want to care about). The shell
was just one more program; it was a program whose job was executing other programs
on behalf of users.

→Certain Unix users take a positively giddy delight in pointing out inefficiencies in other people's code. Most of the time this is constructive criticism gently given and gratefully received.