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Linux Shells by Example by Ellie Quigley

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7.5. Review

7.5.1. Increment and Decrement Operators

% cat datafile
						northwest   NW    Joel Craig       3.0     .98     3      4
						western     WE    Sharon Kelly     5.3     .97     5     23
						southwest   SW    Chris Foster     2.7     .8      2     18
						southern    SO    May Chin         5.1     .95     4     15
						southeast   SE    Derek Johnson    4.0     .7      4     17
						eastern     EA    Susan Beal       4.4     .84     5     20
						northeast   NE    TJ Nichols       5.1     .94     3     13
						north       NO    Val Shultz       4.5     .89     5      9
						central     CT    Sheri Watson     5.7     .94     5     13
					
Example 7.19.
%  awk '/^north/{count += 1; print count}' datafile
						1
						2
						3
					
% cat datafile
						northwest    NW    Joel Craig       3.0     .98     3      4
						western      WE    Sharon Kelly     5.3     .97     5     23
						southwest    SW    Chris Foster     2.7     .8      2     18
						southern     SO    May Chin         5.1     .95     4     15
						southeast    SE    Derek Johnson    4.0     .7      4     17
						eastern      EA    Susan Beal       4.4     .84     5     20
						northeast    NE    TJ Nichols       5.1     .94     3     13
						north NO ...

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