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Counting the number of repetition of a pattern

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# 1  
Old 03-24-2011
Question Counting the number of repetition of a pattern
the o/p of a command is
Code:
-bash-2.05b# grep -o a *
cc:a
dd:a
a
dd:a
office:a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a


how to count how many "a" are there in each file,, cc, dd & office are the file names
# 2  
Old 03-24-2011
Do you need the number of line containing one or more "a" ?

Or do you need the number of "a" ?
Code:
for i in *
do
echo "$i :"
sed 's/[^a]//g' $i | fold -w 1 | uniq -c
done

Or do you need the number of "a" ?
Code:
for i in cc dd office
do
echo "$i :"
sed 's/[^a]//g' $i | fold -w 1 | uniq -c
done

This User Gave Thanks to ctsgnb For This Post:
an2up
# 3  
Old 03-24-2011
but listen, this is not my Q,, I was assign a task.. where I have to find all those filenames, inside the files where the pattern "a" is used only once..
Quote:
I wrote a script..
Code:
for i in *; do if [ `grep -o "a" $i | wc -l` -eq 1 ]; then echo "file is "$i; fi; done

this works fine... but I was asked in interview, how to perform it by command
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