11-06-2017
The word interpolate is one of many English words with several meanings. I certainly agree that the mathematical meaning of interpolate ("insert an intermediate value or term into a series by estimating or calculating it from known surrounding values") makes no sense in this context. And this is how interpolate is most frequently used in this forum.
But, one of the other meanings of interpolate ("alter (a book or text) by insertion of new material") fits what parameter expansion, arithmetic expansion, command substitution, and special variable expansion (each of which are introduced by a leading $ in the shell command language) do if you consider shell commands to be text.
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LEARN ABOUT OPENSOLARIS
fcstrcopyfilename
FcStrCopyFilename(3) FcStrCopyFilename(3)
NAME
FcStrCopyFilename - create a complete path from a filename
SYNOPSIS
cc [ flag... ] file... -lfontconfig [ library... ]
#include <fontconfig.h>
FcChar8 * FcStrCopyFilename (const FcChar8 *s);
DESCRIPTION
FcStrCopyFilename constructs an absolute pathname from s. It converts any leading '~' characters in to the value of the HOME environment
variable, and any relative paths are converted to absolute paths using the current working directory. Sequences of '/' characters are con-
verted to a single '/', and names containing the current directory '.' or parent directory '..' are correctly reconstructed. Returns NULL
if '~' is the leading character and HOME is unset or disabled (see FcConfigEnableHome).
VERSION
Fontconfig version 2.5.0
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWfontconfig |
+-----------------------------+-----------------------------+
|Interface Stability |Volatile |
+-----------------------------+-----------------------------+
|MT-Level |See XInitThreads(3X11) |
+-----------------------------+-----------------------------+
13 November 2007 FcStrCopyFilename(3)