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In each variety, if word is omitted, the empty pattern shall be used. If present, word shall not begin with an unquoted Remove Largest Suffix Pattern. The parameter expansion shall then result in parameter, with the largest portion of the suffix matched by the pattern deleted. If present, word shall not begin with an unquoted Remove Largest Prefix Pattern. The parameter expansion shall then result in parameter, with the largest portion of the prefix matched by the pattern deleted.

The shell shall expand the command substitution by executing command in a subshell environment (see Shell Execution Environment) and replacing the command substitution (the text of command plus the enclosing characters before the end of the output shall not be removed; however, they may be treated as field delimiters and eliminated during field splitting, depending on the value of IFS and quoting that is in effect.

This chapter contains the definition of the Shell Command Language. 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.1-2008.

The shell operates according to the following general overview of operations.

If it encounters the end of input without already having determined that it cannot parse the expansion as an arithmetic expansion, the shell shall treat the expansion as an incomplete arithmetic expansion and report a syntax error.

A conforming application shall ensure that it separates the The expression shall be treated as if it were in double-quotes, except that a double-quote inside the expression is not treated specially.

Otherwise, the value of parameter shall be substituted. and the colon is omitted, the application shall ensure that word is specified (this is necessary to avoid ambiguity with the string length expansion).

The following table summarizes the effect of the The following four varieties of parameter expansion provide for substring processing.

If a command substitution occurs inside double-quotes, field splitting and pathname expansion shall not be performed on the results of the substitution. To specify nesting within the backquoted version, the application shall precede the inner backquotes with , which can introduce an arithmetic expansion or a command substitution that starts with a subshell.With the $(command) form, all characters following the open parenthesis to the matching closing parenthesis constitute the command.Any valid shell script can be used for command, except a script consisting solely of redirections which produces unspecified results.If it is indicated that a token is delimited, and no characters have been included in a token, processing shall continue until an actual token is delimited.In addition, a parameter expansion can be modified by using one of the following formats. If parameter is unset or null, the expansion of word (or an empty string if word is omitted) shall be assigned to parameter.

If a command substitution occurs inside double-quotes, field splitting and pathname expansion shall not be performed on the results of the substitution. To specify nesting within the backquoted version, the application shall precede the inner backquotes with , which can introduce an arithmetic expansion or a command substitution that starts with a subshell.

With the $(command) form, all characters following the open parenthesis to the matching closing parenthesis constitute the command.

Any valid shell script can be used for command, except a script consisting solely of redirections which produces unspecified results.

If it is indicated that a token is delimited, and no characters have been included in a token, processing shall continue until an actual token is delimited.

In addition, a parameter expansion can be modified by using one of the following formats. If parameter is unset or null, the expansion of word (or an empty string if word is omitted) shall be assigned to parameter.

Quoting can be used to preserve the literal meaning of the special characters in the next paragraph, prevent reserved words from being recognized as such, and prevent parameter expansion and command substitution within here-document processing (see Here-Document).