Series
Learn AWK from scratch with step-by-step Linux tutorials: print columns, filter rows, sum values, parse logs and CSV. Every example is tested on gawk and mawk.
8 parts · about 40 min to read
You have a log file, a CSV export or the output of some command, and you want one column, or only the rows that match a condition, or a total....
Dasun Kalupahana
6 min read
Pulling one column out of a text file is the most common thing people use AWK for. It takes one short command, but a few small details decide whether you...
Dasun Kalupahana
4 min read
The most common reason an AWK command prints the wrong thing is that AWK split the line somewhere you did not expect. The rule that decides where to split is...
Dasun Kalupahana
5 min read
Adding up a column of numbers is one of the best reasons to learn AWK. There is no spreadsheet to open and no script to write: one line reads the...
Dasun Kalupahana
5 min read
This is a reference to keep open while you work: the AWK syntax you use most, grouped by task, with the result of each example. Every entry was run on...
Dasun Kalupahana
5 min read
"How many times does this appear?" can mean four different things: how many lines contain it, how many times it appears in total, how many times each value shows up...
Dasun Kalupahana
5 min read
The shortest way to remove duplicate lines from a file in Linux is an AWK one-liner that most people copy without ever reading. It is worth understanding, because the same...
Dasun Kalupahana
5 min read
gsub() is AWK's find-and-replace. It replaces every match of a pattern in a line or in a single column, and it tells you how many replacements it made. It looks...
Dasun Kalupahana
5 min read
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