(diff.info) Standards conformance
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Standards conformance
*********************
In a few cases, the GNU utilities' default behavior is incompatible
with the POSIX standard. To suppress these incompatibilities, define
the `POSIXLY_CORRECT' environment variable. Unless you are checking
for POSIX conformance, you probably do not need to define
`POSIXLY_CORRECT'.
Normally options and operands can appear in any order, and programs
act as if all the options appear before any operands. For example,
`diff lao tzu -C 2' acts like `diff -C 2 lao tzu', since `2' is an
option-argument of `-C'. However, if the `POSIXLY_CORRECT' environment
variable is set, options must appear before operands, unless otherwise
specified for a particular command.
Newer versions of POSIX are occasionally incompatible with older
versions. For example, older versions of POSIX allowed the command
`diff -c -10' to have the same meaning as `diff -C 10', but POSIX
1003.1-2001 `diff' no longer allows digit-string options like `-10'.
The GNU utilities normally conform to the version of POSIX that is
standard for your system. To cause them to conform to a different
version of POSIX, define the `_POSIX2_VERSION' environment variable to
a value of the form YYYYMM specifying the year and month the standard
was adopted. Two values are currently supported for `_POSIX2_VERSION':
`199209' stands for POSIX 1003.2-1992, and `200112' stands for POSIX
1003.1-2001. For example, if you are running older software that
assumes an older version of POSIX and uses `diff -c -10', you can work
around the compatibility problems by setting `_POSIX2_VERSION=199209'
in your environment.
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