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isatty: revert to previous behaviour

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This partially reverts commit 60808a4820.
This commit is contained in:
David Adam
2015-02-01 17:11:44 +08:00
parent 793784c087
commit 66acd17bc0
2 changed files with 27 additions and 24 deletions
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14
doc_src/isatty.txt
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@@ -1,15 +1,17 @@
\section isatty isatty - test if a file or file descriptor is a tty.
\section isatty isatty - test if a file descriptor is a tty.
\subsection isatty-synopsis Synopsis
\fish{synopsis}
isatty [FILE | DEVICE | FILE DESCRIPTOR NUMBER]
isatty [FILE DESCRIPTOR]
\endfish
\subsection isatty-description Description
`isatty` tests if a file or file descriptor is a tty. The argument may be in the form of a file path, device, or file descriptor number. Without an argument, `standard input` is implied.
`isatty` tests if a file descriptor is a tty.
If the resolved file descriptor is a tty, the command returns zero. Otherwise, the command exits one. No messages are printed to standard error.
`FILE DESCRIPTOR` may be either the number of a file descriptor, or one of the strings `stdin`, `stdout`, or `stderr`.
If the specified file descriptor is a tty, the exit status of the command is zero. Otherwise, the exit status is non-zero. No messages are printed to standard error.
\subsection isatty-examples Examples
@@ -20,14 +22,14 @@ From an interactive shell, the commands below exit with a return value of zero:
isatty
isatty stdout
isatty 2
echo | isatty /dev/fd/1
echo | isatty 1
\endfish
And these will exit non-zero:
\fish
echo | isatty
isatty /dev/fd/9
isatty 9
isatty stdout > file
isatty 2 2> file
\endfish