![]() ![]() The shell performs various expansions (separately) on different parts of each command, resulting in a list of pathnames andįields to be treated as a command and arguments see wordexp. The shell parses the input into simple commands (see Simple Commands) and compound commands (see Compound Commands). The shell breaks the input into tokens: words and operators see Token Recognition. ![]() If the first line of a file of shell commands starts with the characters In the System Interfaces volume of POSIX.1-2017. The shell reads its input from a file (see sh), from the -c option or from the The specific details are included in the cited The shell operates according to the following general overview of operations. This chapter describes the syntax of that command language as it is used by the sh utility and the system() and popen() functions defined in the System Interfaces volume of POSIX.1-2017. The shell is a command language interpreter. This chapter contains the definition of the Shell Command Language. ![]() The Open Group Base Specifications Isedition ![]()
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