Shulou(Shulou.com)06/02 Report--

20 useful AWK single-line statements

1. END {print NR} # output total number of lines

2. NR = = 10 # output line 10

3. {print $NF} # output the last column

4. {field = $NF} END {print field} # output the last column of the last line

5. NF > 4 # output all rows with more than 4 columns in input line (this is not in action, so it is a filtering function)

6. $NF > 4 # output all rows with values greater than 4 in the last column of the input line, which is also a filter

7. All cumulative total fields of {nf = nf + NF} END {print nf} # input line

8. / Beth/ {nlines = nlines + 1} END {print nlines} # the total number of lines containing the word Beth

9. $1 > max {max = $1; maxline = $0} END {print max, maxline} # output the largest row in the first column

10. NF > 0 # field outputs non-empty lines

11. Length ($0) > 80 # filter out rows with a length of more than 80

12. {print NF, $0} # output how many columns there are in front of the line

13. {print $2, $1} # output the second column, space, and first column of each row

14. {temp = $1; $1 = $2; $2 = temp; print} # output all rows after the first and second columns swap positions

15. {$1 = NR; print} # replace the first column with the line number and output the line

16. {$2 = "; print} # clear the second column and output all rows

17. {for (I = NF; I > 0; I = I-1) printf ("% s", $I); printf ("\ n")}

# output the whole line in reverse order

18, {sum = 0; for (I = 1; I

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