| Attribute | Description | Required |
|---|
| program | The program to execute without command arguments. | True |
| commandline | The command-line arguments for the program. | False |
| output | The file to which the standard output will be redirected. | False |
| append | True if the output file is to be appended to. | False |
| basedir | The directory the program is in. | False |
| workingdir | The directory in which the command will be executed. | False |
| timeout | Stop the build if the command does not finish within the specified time. Specified in milliseconds. Default is no time out. | False |
| failonerror | Determines whether task failure stops the build or is just reported. Default is "true." | False |
| verbose | Task reports detailed build log messages. Default is "false." | False |
| if | If true then the task will be executed; otherwise skipped. Default is "true." | False |
| unless | Opposite of if. If false then the task will be executed; otherwise skipped. Default is "false." | False |