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+====== Find Longest Line in a File ======
+<code bash>
+awk ' { if ( length > x ) { x = length } }END{ print x }' file.txt
+</code>
+====== Perform Floating Point Calculations ======
+''awk'' can be used for complex calculations, for example:
+<code bash>
+awk 'BEGIN {printf "%.3f\n", sin(30 * atan2(0, -1)/180)}'
+</code>
+will calculate $\sin(30^\circ)=sin(30rad * \frac{\pi}{180})$ and return:
+<code>
+.500
+</code>
+Since ''awk'' does not have a constant for $\pi$, we use ''atan2(0, -1)'' instead.
+====== Delimiter-Style ======
+Suppose you have a file ''input'' containing data separated by delimiters such as:
+<code>
+variable = value
+</code>
+or:
+<code>
+variable = value
+</code>
+The following command can be used to obtain ''value'':
+<code bash>
+awk -F"[ \t]*[=][ \t]*" '{ print $2 }' input
+</code>
+====== Remove Duplicate Entries in File Without Sorting ======
+To remove all duplicates from ''file.txt'' without sorting, issue:
+<code bash>
+awk '!x[$0]++' file.txt
+</code>