look in file, seperate letters, put in order... Post: 57780

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Top Forums UNIX for Advanced & Expert Users look in file, seperate letters, put in order... Post 57780 by jim mcnamara on Friday 5th of November 2004 02:40:28 PM

11-05-2004

Registered User

Code:

#!/bin/ksh 

set -A mycount  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
set -A alphabet A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
let offset=0
char=""
record=""
add_letter ()
{
   let offset=30
   case $char in
     [Aa]) let offset=1
     ;;
     [Bb]) let offset=2
     ;;
     [Cc]) let offset=3
     ;;
     [Dd]) let offset=4
     ;;
     [Ee]) let offset=5
     ;;
     [Ff]) let offset=6
     ;;
     [Gg]) let offset=7
     ;;
     [Hh]) let offset=8
     ;;
     [Ii]) let offset=9
     ;;
     [Jj]) let offset=10
     ;;
     [Kk]) let offset=11
     ;;
     [Ll]) let offset=12
     ;;
     [Mm]) let offset=13
     ;;
     [Nn]) let offset=14
     ;;
     [Oo]) let offset=15
     ;;
     [Pp]) let offset=16
     ;;
     [Qq]) let offset=17
     ;;
     [Rr]) let offset=18
     ;;
     [Ss]) let offset=19
     ;;     
     [Tt]) let offset=20
     ;;
     [Uu]) let offset=21
     ;;
     [Vv]) let offset=22
     ;;
     [Ww]) let offset=23
     ;;
     [Xx]) let offset=24
     ;;
     [Yy]) let offset=25
     ;;
     [Zz]) let offset=26
     ;;
    esac 
    if [ $offset -lt 30 ]; then
       let offset=$offset-1
       mycount[$offset]=`echo "${mycount[offset]} + 1" | bc`
    fi
}
split_to_char()
{
	echo $record | awk '{ for (i=1;i<length($0);i++) print substr($0,i,1) }' |
	while read char
	do
	   
	    add_letter
    done
}

while read record
do
   split_to_char;    
done < $1

touch tmp.tmp

> tmp.tmp

let i=0

while [ $i -lt ${#mycount[*]} ]
do
     printf "%5d %s\n" ${mycount[i]} ${alphabet[i]} >> tmp.tmp
     let i=$i+1
done
echo "Letter count for $1"
echo "Count Letter"
echo "----- ------"
sort -n tmp.tmp 
echo " "
echo "Most common letter"
echo "Count Letter"
echo "----- ------"
sort -n -r tmp.tmp  | head -1
rm -f tmp.tmp
exit

jim mcnamara

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LEARN ABOUT OPENDARWIN

lseek

LSEEK(2)						      BSD System Calls Manual							  LSEEK(2)

NAME

     lseek -- reposition read/write file offset

SYNOPSIS

     #include <unistd.h>

     off_t
     lseek(int fildes, off_t offset, int whence);

DESCRIPTION

     The lseek() function repositions the offset of the file descriptor fildes to the argument offset according to the directive whence. The argu-
     ment fildes must be an open file descriptor.  Lseek() repositions the file pointer fildes as follows:

	   If whence is SEEK_SET, the offset is set to offset bytes.

	   If whence is SEEK_CUR, the offset is set to its current location plus offset bytes.

	   If whence is SEEK_END, the offset is set to the size of the file plus offset bytes.

     The lseek() function allows the file offset to be set beyond the end of the existing end-of-file of the file. If data is later written at
     this point, subsequent reads of the data in the gap return bytes of zeros (until data is actually written into the gap).

     Some devices are incapable of seeking.  The value of the pointer associated with such a device is undefined.

RETURN VALUES

     Upon successful completion, lseek() returns the resulting offset location as measured in bytes from the beginning of the file.  Otherwise, a
     value of -1 is returned and errno is set to indicate the error.

ERRORS

     Lseek() will fail and the file pointer will remain unchanged if:

     [EBADF]		Fildes is not an open file descriptor.

     [ESPIPE]		Fildes is associated with a pipe, socket, or FIFO.

     [EINVAL]		Whence is not a proper value.

SEE ALSO

     dup(2), open(2)

BUGS

     This document's use of whence is incorrect English, but is maintained for historical reasons.

STANDARDS

     The lseek() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').

4th Berkeley Distribution					  April 19, 1994					 4th Berkeley Distribution

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