Can anyone tell me the Working of this scripts

Question

matrix

1 2 3

4 5 6

1 8 9

awk '{for (i=1;i<=NF+1-NR;i++) printf "%s%s",$i,FS; print""}' matrix

1 2 3

4 5

7

awk '{for (i=1;i<=NF;i++) if (NR>=1 && NR==i) {for (j=1;j<=i-1;j++) printf " ";print $(i-0)}}' matrix

1

 2

   3

     4

Answer 1

NF , store the number of field in a record. From your matrix each line have 3 element, so NF is 3.

NR gives you the total number of records being processed or line number, it is a dynamic variable value change from 1-3 reference to your matrix.

You should have a look and research on awk command. http://www.thegeekstuff.com/2010/01/8-powerful-awk-built-in-variables-fs-ofs-rs-ors-nr-nf-filename-fnr/?ref=binfind.com/web