different between delink vs unlink

English

de- +? link

delink (third-person singular simple present delinks, present participle delinking, simple past and past participle delinked)

un- +? link

unlink (third-person singular simple present unlinks, present participle unlinking, simple past and past participle unlinked)

(transitive) To decouple; to remove a link from, or separate the links of.
(transitive, computing, Unix) To delete (a file).
- 2001, Tom Phoenix, Randal L. Schwartz, Learning Perl, "O'Reilly Media, Inc." (?ISBN), page 175:
  That's because the permission to unlink a file doesn't depend upon the permission bits on the file itself; it's the permission bits on the directory that contains the file that matter.

unlink (plural unlinks)

(mathematics, knot theory) A link that is equivalent (under ambient isotopy) to finitely many disjoint circles in the plane.

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