The Bourne shell, sh, was written by Stephen Bourne at AT&T as the original Unix command line interpreter; it introduced the basic features common to all the Unix shells, including piping, here documents, command substitution, variables, control structures for condition-testing and looping and filename wildcarding.
Languages that support variable interpolation include Perl, PHP, Ruby, Tcl, Groovy, and most Unix shells.
In most Unix shells (command interpreters), this is represented by the vertical bar character.
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According to its creator Julian Assange: "Surfraw provides a fast unix command line interface to a variety of popular WWW search engines and other artifacts of power. It reclaims google, altavista, dejanews, freshmeat, research index, slashdot, and many others from the false-prophet, pox-infested heathen lands of html forms, placing these wonders where they belong; deep in unix heartland, as god-loving extensions to the shell."
Korn shell, a Unix shell developed by David Korn in the early 1980s