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docs/Linux/filtres.md

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+# Filtres
+
+#### sort
+
+Sorts standard input then outputs the sorted result on standard output.
+
+#### uniq
+
+Given a sorted stream of data from standard input, it removes duplicate lines of data (i.e., it makes sure that every line is unique).
+
+#### grep
+
+Examines each line of data it receives from standard input and outputs every line that contains a specified pattern of characters.
+
+#### fmt
+
+Reads text from standard input, then outputs formatted text on standard output.
+
+#### pr
+
+Takes text input from standard input and splits the data into pages with page breaks, headers and footers in preparation for printing.
+
+#### head
+
+Outputs the first few lines of its input. Useful for getting the header of a file.
+
+#### tail
+
+Outputs the last few lines of its input. Useful for things like getting the most recent entries from a log file.
+
+#### tr
+
+Translates characters. Can be used to perform tasks such as upper/lowercase conversions or changing line termination characters from one type to another (for example, converting DOS text files into Unix style text files).
+
+#### sed
+
+Stream editor. Can perform more sophisticated text translations than tr.
+
+#### awk
+
+An entire programming language designed for constructing filters. Extremely powerful.
+
+
+
+`-rw-r–r– 1 root root 0 avril 24 22:49 security.ubuntu.com*ubuntu*dists*xenial-security*restricted*binary-i386*Packages`