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Shell Programming and Scripting

Counting a Char

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# 1  
Old 06-15-2012
Counting a Char
how to count how many R in the below file.

Code:
Rttt
1Rxxx
GG
2R
3R
4R
5R
6R
7R
R0
R1
R2
R3
R4
R5
R6
R7
RR
R9
9R

Ans is 20.
what is command/script?
Last edited by methyl; 06-15-2012 at 06:36 PM.. Reason: please use code tags
# 2  
Old 06-15-2012
Code:
wc -c filename

Note: each carriage return (new line) counts as a character.
# 3  
Old 06-15-2012
This should help:

Code:
awk -F"R" '{counter+=(NF-1)}END{print counter}' file.txt
20

# 4  
Old 06-15-2012
Code:
awk 'END{print NR-1}' RS=R infile

# 5  
Old 06-15-2012
Or
Code:
wc -lc filename | read a b notused && echo $(( $b - $a ))

# 6  
Old 06-15-2012
And just for the fun of it, the old way:
Code:
fold -1 filename | grep -c "R"

20


And a lateral thought way. Delete everything you are not interested in and count what is left.

Code:
cat filename | tr -cd "R" | wc -c

20

Last edited by methyl; 06-15-2012 at 08:16 PM.. Reason: amend testing filename to generic
# 7  
Old 06-15-2012
Code:
grep -o R file | wc -l

Code:
tr -cd R <file | wc -c
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