A Short Guide to AWK
AWK is built to process column-oriented text data, such as tables. In which a file is considered to consist of N records (rows) by M fields (columns) Basic # awk < file ‘{print $2}’ # awk ‘{print $2}’ file file = input file print $2 = 2nd field of the line, awk has whitespace as the default delimiter Delimiter # awk -F: ‘{print $2}’ file -F: = use ‘:’ as delimiter # awk -F ‘[:;]’ ‘{print $2}’ file -F ‘[:;]’ = use multiple delimiter, and parse using EITHER ‘:’ OR ‘;’ # awk -F ‘:;’ ‘{print $2}’ file -F ‘:;’ = use multiple delimiter, and parse using ':;’ as THE delimiter # awk -F ‘:’+ ‘{print $2}’ file -F ‘:’+ = use multiple delimiter, to match any number ':' Arithmetic # echo 5 4 | awk '{print $1 + $2}' output is '9', the result of ‘+’ (works as addition) # echo 5 4 | awk '{print $1 $2}' output is '54', to get string concatenation # echo 5 4 | awk '{print $1, $2}' output is '5 4',...