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-rw-r--r--doc/coreutils.texi5
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 86394a152..16ff61395 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -2782,9 +2782,10 @@ growing.
The option values @samp{descriptor} and @samp{name} may be specified only
with the long form of the option, not with @option{-f}.
-@vindex POSIXLY_CORRECT
-If @env{POSIXLY_CORRECT} is set, the @option{-f} option is ignored if
+The @option{-f} option is ignored if
no @var{file} operand is specified and standard input is a FIFO or a pipe.
+Likewise, the @option{-f} option has no effect for any
+operand specified as @samp{-}, when standard input is a FIFO or a pipe.
@item -F
@opindex -F