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Diffstat (limited to 'doc/gawk.texi')
| -rw-r--r-- | doc/gawk.texi | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/doc/gawk.texi b/doc/gawk.texi index a74773ca..b56cbbcf 100644 --- a/doc/gawk.texi +++ b/doc/gawk.texi @@ -893,7 +893,9 @@ Such jobs are often easier with @command{awk}. The @command{awk} utility interprets a special-purpose programming language that makes it easy to handle simple data-reformatting jobs. -The GNU implementation of @command{awk} is called @command{gawk}; it is fully +The GNU implementation of @command{awk} is called @command{gawk}; if you +invoke it with the proper options or environment variables +(@pxref{Options}), it is fully compatible with the POSIX@footnote{The 2008 POSIX standard can be found online at @url{http://www.opengroup.org/onlinepubs/9699919799/}.} @@ -3429,7 +3431,10 @@ program source code. If the environment variable @env{POSIXLY_CORRECT} exists, then @command{gawk} behaves in strict POSIX mode, exactly as if you had supplied the @option{--posix} command-line option. -Many GNU programs look for this environment variable to turn on +Many GNU programs look for this environment variable to suppress +extensions that conflict with POSIX, but @command{gawk} behaves +differently: it suppresses all extensions, even those that do not +conflict with POSIX, and behaves in strict POSIX mode. If @option{--lint} is supplied on the command line and @command{gawk} turns on POSIX mode because of @env{POSIXLY_CORRECT}, then it issues a warning message indicating that POSIX @@ -11079,6 +11084,9 @@ patterns. Likewise, the special patterns @code{BEGIN}, @code{END}, which never match any input record, are not expressions and cannot appear inside Boolean patterns. +The precedence of the different operators which can appear in +patterns is described in @ref{Precedence}. + @node Ranges @subsection Specifying Record Ranges with Patterns |