(sed.info.gz) wc -w

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(sed.info.gz) wc -c

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(sed.info.gz) wc -l

 
 Counting Words
 ==============
 
    This script is almost the same as the previous one, once each of the
 words on the line is converted to a single `a' (in the previous script
 each letter was changed to an `a').
 
    It is interesting that real `wc' programs have optimized loops for
 `wc -c', so they are much slower at counting words rather than
 characters.  This script's bottleneck, instead, is arithmetic, and
 hence the word-counting one is faster (it has to manage smaller
 numbers).
 
    Again, the common parts are not commented to show the importance of
 commenting `sed' scripts.
 
      #!/usr/bin/sed -nf
      
      # Convert words to a's
      s/[ tab][ tab]*/ /g
      s/^/ /
      s/ [^ ][^ ]*/a /g
      s/ //g
      
      # Append them to hold space
      H
      x
      s/\n//
      
      # From here on it is the same as in wc -c.
      /aaaaaaaaaa/! bx;   s/aaaaaaaaaa/b/g
      /bbbbbbbbbb/! bx;   s/bbbbbbbbbb/c/g
      /cccccccccc/! bx;   s/cccccccccc/d/g
      /dddddddddd/! bx;   s/dddddddddd/e/g
      /eeeeeeeeee/! bx;   s/eeeeeeeeee/f/g
      /ffffffffff/! bx;   s/ffffffffff/g/g
      /gggggggggg/! bx;   s/gggggggggg/h/g
      s/hhhhhhhhhh//g
      :x
      $! { h; b; }
      :y
      /a/! s/[b-h]*/&0/
      s/aaaaaaaaa/9/
      s/aaaaaaaa/8/
      s/aaaaaaa/7/
      s/aaaaaa/6/
      s/aaaaa/5/
      s/aaaa/4/
      s/aaa/3/
      s/aa/2/
      s/a/1/
      y/bcdefgh/abcdefg/
      /[a-h]/ by
      p
 

Info Catalog

(sed.info.gz) wc -c

(sed.info.gz) Examples

(sed.info.gz) wc -l