(a) When a convict is sentenced to imprisonment in the penitentiary on two or more convictions, unless it is specifically ordered in the judgment entry that such sentences be served concurrently, such sentences shall be cumulative and shall be served consecutively, the first term thereof beginning to run from the date on which such prisoner is received at the penitentiary, reformatory or jail for service of the sentence or at some place of detention to await transportation to the place where his sentences are to be served and his second and subsequent terms, each, beginning on the expiration of the preceding term. When the judgment sentence contains a fixed order that the term shall run concurrently, such sentences shall run concurrently from the date on which such convict is received for serving of the sentences as prescribed above.

(b) In case the prison record of a convict serving two or more sentences consecutively is good, he shall be discharged at the expiration of the last term of imprisonment to which he was sentenced, less any deduction from the sentences accorded him pursuant to Sections 14-9-1 through 14-9-3.

(c) In case the prison record of a convict serving two or more sentences concurrently is good, he shall be discharged at the expiration of the longest term of imprisonment to which he was sentenced, less any deduction therefrom accorded him pursuant to Sections 14-9-1 through 14-9-3.

(d) In case the record of a prisoner during his term shall not have been good, the director, at his discretion, may revoke any or all of the deductions given under Sections 14-9-1 through 14-9-3, whether such convict is serving his terms of imprisonment concurrently or consecutively.