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ex4_rev.awk (358B)

      1 #!/usr/bin/env -S awk -f
      2 
      3 BEGIN {
      4         # Quit if we don't have an input file.
      5         if (ARGC < 2) {
      6                 print "usage: ex4_rev.awk file";
      7                 exit 1;
      8         }
      9 }
     10 
     11 {
     12         # Add all lines to an array.
     13         ln[NR] = $0;
     14 }
     15 
     16 END {
     17         # Print them in reverse.
     18         for (i = NR; i >= 1; i--)
     19                 print ln[i];
     20 }