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In [[computing]], '''control-\''' is a [[control character]] in [[ASCII code]], also known as the '''file separator''' or '''field separator''' ('''[[field separator|FS]]''') character. It is generated by pressing the {{keypress|'''[[backslash|\]]'''}} key while holding down the {{keypress|[[control key|Ctrl]]}} key on a [[computer keyboard]].
In its use as a file separator, this character can be used to subdivide textual data into [[Record (computer science)|records]] or other semantic units; for instance, it has this role in the ANSI/NIST-ITL Standard Data Format for the Interchange of Fingerprint, Facial & Other Biometric Information.<ref>{{citation|url=https://www.nist.gov/publications/data-format-interchange-fingerprint-facial-other-biometric-information-ansinist-itl-1-1|date=August 22, 2016|first=Kevin|last=Mangold|doi=10.6028/NIST.SP.500-290e3|title=Data Format for the Interchange of Fingerprint, Facial & Other Biometric Information ANSI/NIST-ITL 1-2011 NIST Special Publication 500-290 Edition 3|contribution=Annex B: Traditional Encoding|pages=509–522|publisher=[[American National Standards Institute]] and [[National Institute of Standards and Technology]]}}</ref>
Under most [[UNIX]]-based operating systems control-\ is used to terminate a running [[process (computing)|process]] from a [[shell (computing)|command shell]] and have it produce a [[core dump|memory core dump]] by sending it a [[SIGQUIT]] [[signal (computing)|signal]].<ref>{{citation|title=Advanced Programming in the UNIX Environment|series=Addison-Wesley professional computing series|first1=W. Richard|last1=Stevens|first2=Stephen A.|last2=Rago|publisher=Pearson Education|year=2013|isbn=9780321637734|page=300|url=https://books.google.com/books?id=_kpsAQAAQBAJ&pg=PA300}}</ref>
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