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Count occurances of a character in a file


 
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# 1  
Old 12-24-2007
Count occurances of a character in a file

I want to find the number of occurences of a character in a file.
How do i do it.

Eg:
$cat file1.txt
Welcome to World of Unix.
$

If i want to find the occurences of 'o' then I should be getting 3.

Thanks.
# 2  
Old 12-24-2007
Code:
echo "start with this" | awk '{ for ( i=1; i<=length; i++ ) arr[substr($0, i, 1)]++ }END{ for ( i in arr ) { print i, arr[i] } }'

# 3  
Old 12-24-2007
Thanks buddy,

Can you explain me where the actual conting of string happens..
I am unable to understand the script
# 4  
Old 12-24-2007
Code:
 # awk 'BEGIN{FS=""}{array[$1]++}END{ # code to print values}' file

# 5  
Old 12-24-2007
Quote:
Originally Posted by Shivdatta
Thanks buddy,

Can you explain me where the actual conting of string happens..
I am unable to understand the script
Extract each character and create an associative array which maps between the character and the count of character
# 6  
Old 12-24-2007
Hi, Shivdatta.

Do you wish to count occurrences of all characters or of a specific character? ... cheers, drl

Last edited by drl; 12-24-2007 at 09:02 AM..
# 7  
Old 12-24-2007
Quote:
Originally Posted by Shivdatta
I want to find the number of occurences of a character in a file.
How do i do it.

Eg:
$cat file1.txt
Welcome to World of Unix.
$

If i want to find the occurences of 'o' then I should be getting 3.

Code:
tr -cd o file1.txt | wc -c


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