copied awk tables from unix programming environment book

awk_built_in_variables.txt

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+---------------- Table 4.3 ----------------
+           awk Built-in Variables
+
+FILENAME        name of current input file
+FS              field separator character (default blank & tab)
+NF              number of fields in input record
+NR              number of input record
+OFMT            output format for numbers (default %g; see printf(3))
+OFS             output field separator string (default blank)
+ORS             output record separator string (default newline)
+RS              input record seaparator character (default newline)

awk_operators.txt

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+------------------ Table 4.4 ------------------
+ awk Operators (increasing order of precedence)
+
+= += -k *= /= %=        assignment; v op= expr is v = v op (expr)
+||                      OR: expr1 || expr2 true if either is;
+                            expr2 not evaluated if expr1 is true
+&&                      AND: expr1 && expr2 true if both are;
+                            expr2 not evaluated if expr1 is false
+!                       negate value of expression
+> >= < <= == != ~ !~    relational operators;
+                            ~ and !~ are match and non-match
+nothing                 string concatenation
++ -                     plus, minus
+* / %                   multiply, divide, remainder
+++ --                   increment, decrement (prefix or postfix)