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sed command in Linux | Unix

SED command in UNIX is stands for stream editor and it can perform lot’s of function on file like, searching, find and replace, insertion or deletion. Though most common use of SED command in UNIX is for substitution or for find and replace. By using SED you can edit files even without opening it, which is much quicker way to find and replace something in file, than first opening that file in VI Editor and then changing it. Learn Unix Command : 1)cat command :    • cat command in unix   2)ls command :    • ls command in unix   3)mkdir and cd command :    • mkdir and cd command   4)cp command :    • cp command in unix   5)cut , paste and tr command :    • Unix Command |cut | paste | tr | Unix...   6)sort command:   • sort command in Unix | Linux   7)uniq command :    • uniq command in Unix | uniq command i...