Reference
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onfail
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onfail
Built-in command
No arguments
Description:
Execute following commands when an error is encountered in the body of the
local...endlocal
block.
The status value is set with the corresponding error message.
Example of use:
$ gmic
image.jpg
+local blur -3 onfail mirror x endlocal
Command:
image.jpg
+local blur -3 onfail mirror x endlocal
Command:
image.jpg
+local blur -3 onfail mirror x endlocal