Evaluate the given ClassAd expression(s) in the context of the given ClassAd attributes, and prints the result in ClassAd format.

## Description¶

classad_eval is designed to help you understand and debug ClassAd expressions. You can supply a single ClassAd on the command-line, or via a file, as context for evaluating the expression.

## Examples¶

Almost every ad and almost every expression will require you to single quote them. For example, the first line of the following won’t work if you have a file named attempt2, but the second one will:

classad_eval a=2 a*2
classad_eval 'a = 2' 'a * 2'


The simplest ad that will work assigns a value to an attribute, as seen above. You may set multiple attributes in the following way:

classad_eval '[ a = 2; b = 2 ]' 'a + b'


You must supply an empty ad for expressions that don’t reference attributes:

classad_eval '' 'strcat("foo", "bar")'


If you want to evaluate an expression in the context of the job ad, first store the job ad in a file:

condor_q -l 1777.2 > 1227.2.ad


You can extract a machine ad in a similar way:

condor_status -l exec-17 > exec-17.ad