awk is a precise finding and progressive process, but can not modify the file.
awk use:
Pre-command | awk options (condition) command
Common options are [-F] defined delimiter
Instruction print print output results BEGIN start END End
Built-in variables $ 1 $ 2 $ 3 ..... different column $ 0 for all columns NR NF line number column number
awk '{print}' file name which is the output of view as all lines and cat
awk '{print $ 1}' file name which is the output of the first column for all rows
awk '{print $ 2}' file name which is the output of the second column for all aircraft
awk '{print $ 1, $ 2}' file name which is the output of all the rows 2-3 column es
awk '{print $ 0}' output file name that all lines are generally used with other variables
awk -F (defined separator) '{print $ 1}' file name is defined as a colon delimiter, a first display column
awk -F (defined separator) '{print $ 1 "ha"}' file name display variable plus constant
awk -F: '{print NR, NF}' filename colon delimiters, and the total number of display line numbers and number sequence
