Adding a file for awk.

pages/common/awk.md

@@ -0,0 +1,21 @@
+# awk
+
+> A versatile programming language for working on files
+
+- Print the fifth column in a space sepearted file
+
+`awk '{print $5}' {{filename}}`
+
+- Print the third column in a comma sepearted file
+
+`awk -F ',' '{print $3}' {{filename}}`
+
+- Sum the values in the first column and print the total
+
+`awk '{s+=$1} END {print s}' {{filename}}`
+
+- Sum the values in the first column and pretty-print the values and then the total
+
+`awk '{s+=$1; print $1} END {print "--------"; print s}' {{filename}}`
+
+