most commands take crab instance from the working directory, but autocompletion still suggests that it can be used as option, e.g.
crab kill --help
Usage: crab.py kill [options] [args]
Command to kill submitted tasks. The user must give the crab project
directory for the task he/she wants to kill.
Options:
-h, --help show this help message and exit
--killwarning=KILLWARNING
A warning message to be appended to the warnings list
shown by "crab status"
--proxy=PROXY Use the given proxy. Skip Grid proxy creation and
myproxy delegation.
-d PROJDIR, --dir=PROJDIR
Path to the CRAB project directory for which the crab
command should be executed.
--instance=INSTANCE Running instance of CRAB service. Valid values are
dict_keys(['prod', 'preprod', 'auth', 'test1',
'test2', 'test3', 'test4', 'test5', 'test6', 'test11',
'test12', 'stefanovm', 'stefanovm2', 'other']).
most commands take crab instance from the working directory, but autocompletion still suggests that it can be used as option, e.g.