The phrase "a command that is" is correct and usable in written English.
It can be used when referring to a specific command that has certain characteristics or qualities.
Example: "The system will execute a command that is designed to optimize performance."
Alternatives: "an instruction that is" or "a directive that is".
In launching a war on Iraq that we have been unable to win, we have done the one thing a leader is supposed never to do: issue a command that is not followed.
The United States could use the anti-Taliban Northern Alliance as a proxy ground force, but the group is not widely supported throughout Afghanistan, and has no more than 12,000 fighters under a command that is in flux.
So when she goes out into the world, she's going out with a command that is hers.
A cron job is simply a command that is run automatically at certain predetermined times.
If it is a command that is not used on certain objects, it could look like this: @echo off.
This is why you don't want to give a command that is not followed, and then discipline.
And he does, with an intelligence and a command that are very impressive, and that can also, like his subject's, be a little daunting.
In fact, there were only a few instances in which it had some trouble, and those were usually over band names, a command that's a lot more difficult than, say, asking about the weather, for myriad reasons.
This group quickly ordered the execution, without trial, of 61 ex-officials of the ousted imperial government — a command that was carried out on November 23 , 1974
Although later accounts of the siege claimed Vetch's detachment was part of a strategic plan to surround the fort, contemporary accounts report that Vetch wanted to have a command that was somewhat independent of Nicholson.
The inexperienced soldiers were assigned to the 29th Infantry Regiment, 2nd Infantry Division, a command that was preparing other battalions to move into Korea and to relieve the other units of the 24th Infantry Division.
