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Implementing wc using awk (without using wc)

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Usage: awc [OPTION]... [FILE]...
Print newline, word, and byte counts for a FILE
c, --bytes print the byte counts
-m, --chars print the character counts
-l, --lines print the newline counts
-L, --max-line-length print the length of the longest line
-w, --words print the word counts
--help display this help and exit
--version output version information and exit"

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  1. #!/bin/bash
  2. # Author : Abhinay Omkar (c) 2007
  3. # Description : wc using awk. without using wc.
  4. # License : GPLv2
  5. # This is free software.  You may redistribute copies of it under the terms of
  6. # the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  7. # There is NO WARRANTY, to the extent permitted by law.
  8. # 
  9. # Copyright (C) 2007 Free Software Foundation, Inc.
  10.  
  11. case $1 in
  12.    -*)
  13. 	  OPTION=$1
  14. 	  FILENAME=$2
  15. 	  ;;
  16.        *)
  17. 	  FILENAME=$1
  18. 	  OPTION=$2
  19. 	  ;;
  20. esac
  21.  
  22. #Count number of lines:
  23. #awk -F '\n' 'BEGIN {n=0} {++n} END {print n}' dmsg
  24.  
  25. #Count number of chars: 
  26. #awk -F '\n' 'BEGIN {c=0} {if(c==0) c=length($1); else c+=length($1)} END {print c}' dmsg
  27. #+
  28. #awk -F '\n' 'BEGIN {b=0} /^$/ {++b} END {print b}' dmsg 
  29. #+
  30. #awk -F '\n' 'BEGIN {nb=0} !/^$/ {++nb} END {print nb}' dmsg
  31.  
  32. #Count number of words:
  33. #awk 'BEGIN {w=0} {OFS="[:blank:]+"; if(w==0) w=NF; else w+=NF} END {print w}' dmsg
  34.  
  35. #Longest line in a file:
  36. #awk -F '\n' 'BEGIN {L=0} {if(length($1)>L) L=length($1)} END {print L}' dmsg
  37.  
  38. case $OPTION in
  39.    -l|--lines)
  40.         echo `awk -F '\n' 'BEGIN {n=0} {++n} END {print n}' $FILENAME` $FILENAME
  41.         ;;
  42.    -c|-m|--chars|--bytes)
  43.          echo `expr \`awk -F '\n' 'BEGIN {c=0} {if(c==0) c=length($1); else c+=length($1)} END {print c}' $FILENAME\` + \`awk -F '\n' 'BEGIN {b=0} /^$/ {++b} END {print b}' $FILENAME\` + \`awk -F '\n' 'BEGIN {nb=0} !/^$/ {++nb} END {print nb}' $FILENAME\`` $FILENAME
  44.         ;;
  45.    -w|--words)
  46. 	echo `awk 'BEGIN {w=0} {OFS="[:blank:]+"; if(w==0) w=NF; else w+=NF} END {print w}' $FILENAME` $FILENAME
  47. 	;;
  48.    -L|--max-line-length)
  49. 	echo `awk -F '\n' 'BEGIN {L=0} {if(length($1)>L) L=length($1)} END {print L}' $FILENAME` $FILENAME
  50. 	;;
  51.    -v|--version)
  52. 	echo "wc using awk. without using wc.
  53. This is free software.  You may redistribute copies of it under the terms of
  54. the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  55. There is NO WARRANTY, to the extent permitted by law.
  56.  
  57. Copyright (C) 2007 Free Software Foundation, Inc.
  58. Written by Abhinay Omkar"
  59. 	;;
  60.    *)
  61. 	echo "Written by Abhinay Omkar
  62. Usage: awc [OPTION]... [FILE]...
  63. Print newline, word, and byte counts for a FILE
  64. 	c, --bytes            print the byte counts
  65. 	-m, --chars            print the character counts
  66. 	-l, --lines            print the newline counts
  67. 	-L, --max-line-length  print the length of the longest line
  68. 	-w, --words            print the word counts
  69. 	--help     display this help and exit
  70. 	--version  output version information and exit"
  71.  
  72.         exit 1
  73.         ;;
  74. esac

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