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The POSIX Command Language and Utilities standard for
introduced the following changes into the language:
CONVFMTfor controlling the conversion of numbers to strings (see section Conversion of Strings and Numbers).
The following common extensions are not permitted by the POSIX standard:
\xescape sequences are not recognized (see section 3.2 Escape Sequences).
FSis equal to a single space (see section Examining Fields).
funcfor the keyword
functionis not recognized (see section Function Definition Syntax).
FSto be a single TAB character (see section Specifying How Fields Are Separated).
fflushbuilt-in function is not supported (see section Input/Output Functions).
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