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awk

summary

    This subchapter looks at awk, a UNIX (and Linux) command.

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awk

    This subchapter looks at awk, a UNIX (and Linux) command.

    awk is a programming language intended to serve a place between simple shell scripts and full programming languages. It is Turing complete.

remove duplicate lines

    You can use awk to remove duplicate lines from a file.

    $ awk '!($0 in array) { array[$0]; print }' filename

other

    On November 8, 2010, Ramesh Natarajan named this the number six (6) most frequently used UNIX/Linux command at this web page 50 Most Frequently Used UNIX / Linux Commands (With Examples).

    In June 2009, Ken Milberg named this command as one of the Top 50 universal UNIX commands at this web page Top 50 Universal INIX commands. Note that this web page requires agreeing to be spammed before you can read it.

    “awk is a pattern matching and formatting language. It is a programming language. When needed, it is very useful. However, Perl and Python also have the capabilities of Awk and many extras, so many people use them instead of Awk. GNU Awk has some more capabilities than the traditional or POSIX versions of Awk.” —Jonathan Leffler

    “AWK is a programming language designed by Aho, Weinberger, and Kernighan. gawk is one implementation of AWK, but there are several others, including mawk, and nawk. It is a full-blown programming language with variables, control structures, and associative arrays, but generally optimized for dealing with the sorts of text-based data commonly found on UNIX systems.” —ephemient

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