05-06-2015
Hi Sea, the previous read command is not useless, it is there to cater for the possibilty that a filename has no extension. It splits the filename into a first part before the first dot and (into variable
first) and a last part (into variable
last) that contains everything after the first dot.
If the file contains no extension, then the variable
last will be empty and thus
echo "${last##*.}" will produce an empty string (
"").
If there is an extension then
echo "${last##*.}" will produce the part after the last dot..
It is indeed not REGEX; it is
parameter expansion...
Last edited by Scrutinizer; 05-06-2015 at 11:58 PM..
This User Gave Thanks to Scrutinizer For This Post:
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LEARN ABOUT MOJAVE
glutextensionsupported
glutExtensionSupported(3GLUT) GLUT glutExtensionSupported(3GLUT)
NAME
glutExtensionSupported - helps to easily determine whether a given OpenGL extension is supported.
SYNTAX
#include <GLUT/glut.h>
int glutExtensionSupported(char *extension);
ARGUMENTS
extension Name of OpenGL extension.
DESCRIPTION
glutExtensionSupported helps to easily determine whether a given OpenGL extension is supported or not. The extension parameter names the
extension to query. The supported extensions can also be determined with glGetString(GL_EXTENSIONS), but glutExtensionSupported does the
correct parsing of the returned string.
glutExtensionSupported returns non-zero if the extension is supported, zero if not supported.
There must be a valid current window to call glutExtensionSupported.
glutExtensionSupported only returns information about OpenGL extensions only. This means window system dependent extensions (for example,
GLX extensions) are not reported by glutExtensionSupported.
EXAMPLE
Here is an example of using glutExtensionSupported:
if (!glutExtensionSupported("GL_EXT_texture")) {
fprintf(stderr, "Missing the texture extension!
");
exit(1);
}
Notice that the name argument includes both the GL prefix and the extension family prefix (EXT).
SEE ALSO
glutGet, glGetString
AUTHOR
Mark J. Kilgard (mjk@nvidia.com)
GLUT
3.7 glutExtensionSupported(3GLUT)