CERTIFY
Generally speaking, certifications can help you get a job. This is especially true for individuals just getting started in a career. Unfortunately, many of the recognized certifications require a certain level of experience that those just starting out do not yet possess. The situation is even worse in the forensics field as some certification organizations require active full-time employment with a government entity. To further complicate things, there is no universally accepted certification in digital forensics.
In the broader field of information security, the Certified Information Systems Security Professional (CISSP) from the International Information System Security Certification Consortium (ISC)2 is considered to be the standard certification all practitioners should hold in many countries, including the United States. (ISC)2 offers a Certified Cyber Forensics Professional (CCFP) certification. Unlike the CISSP, the CCFP is not considered essential by many organizations. Like the CISSP, if you want to be a CCFP but you lack experience, you can take the test and become an Associate of (ISC)2 who is granted the certification later after you have obtained the required experience.
Many of the forensics certifications that are not tied to government employment are issued by vendors. Given the open source nature of Linux, certifications specific to Linux forensics appear to be non-existent at this time. The net of all of this is that you should be cautious about spending money on forensics certifications unless you know they will be required for a specific job.