The Open Group Base Specifications Issue 7, 2018 edition IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008) Copyright © 2001-2018 IEEE and The Open Group 2. Shell Command Language This chapter contains the definition of the Shell Command Language. 2.1 Shell Introduction The shell is a command language interpreter. This chapter describes the syntax of that command language as it is used by the