====== Command line utilites ======
===== Text file utils =====

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**sed** - stream editor for filtering and transforming text ([[http://ru.wikipedia.org/wiki/Sed|wiki]])\\
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**grep, egrep, fgrep, rgrep** - print lines matching a pattern\\
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**tr** - translate or delete characters\\
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**cat** - concatenate files and print on the standard output\\
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**xargs** - build and execute command lines from standard input\\
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