[taler-docs] 02/04: document /bin/sh-like variable reference in filenames

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commit cd8a3898fdd4e77b7da69f4563f9f64545505e47
Author: Thien-Thi Nguyen <ttn@gnuvola.org>
AuthorDate: Wed Dec 9 03:46:13 2020 -0500

    document /bin/sh-like variable reference in filenames
---
 manpages/taler.conf.5.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/manpages/taler.conf.5.rst b/manpages/taler.conf.5.rst
index 1e6031a..b3ab048 100644
--- a/manpages/taler.conf.5.rst
+++ b/manpages/taler.conf.5.rst
@@ -28,6 +28,12 @@ In particular, boolean values are one of ``YES`` or ``NO``.
 Values can include whitespace by surrounding
 the entire value with ``"`` (double quote).
 
+Values that represent filenames can begin with a ``/bin/sh``-like
+variable reference.
+This can be simple, such as ``$TMPDIR/foo``, or complex,
+such as ``${TMPDIR:-${TMP:-/tmp}}/foo``.
+See ``[PATHS]`` (below).
+
 .. The @INLINE@ feature should remain undocumented since in practice, using
    it (even correctly) elicits a warning and does not actually include the
    specified file.  Maybe this will change in the future?  --ttn

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