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Grep command to count characters

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# 8  
Old 01-19-2010
Quote:
Originally Posted by methyl
(thegeek is outputting characters 17-21 with a newline after each character then counting the number of lines containing a letter "Y" ). Ingenious.
But it doesn't give the desired output:

Code:
$ cat file
1234567890123456789012345
BBBBBBYBBBBYBBYBBYBBYBBBB
BBBBBBYBBBBYBBYBBBBBYBBBB
BBBBBBYBBBBYBBYBYBBBBBBBB
$ sed 's/^.\{17\}\(.\)\(.\)\(.\)\(.\).*$/\1\n\2\n\3\n\4/' file|grep -c 'Y'
3

# 9  
Old 01-19-2010
Quote:
Originally Posted by Franklin52
But it doesn't give the desired output:

Code:
$ cat file
1234567890123456789012345
BBBBBBYBBBBYBBYBBYBBYBBBB
BBBBBBYBBBBYBBYBBBBBYBBBB
BBBBBBYBBBBYBBYBYBBBBBBBB
$ sed 's/^.\{17\}\(.\)\(.\)\(.\)\(.\).*$/\1\n\2\n\3\n\4/' file|grep -c 'Y'
3

I wouldn't describe it as "ingenious" by any means, but it might work - on Linux at least - even if it does only takes characters 18 to 21 Smilie
# 10  
Old 01-19-2010
It is not because of grep. It is because of the characters which i have selected.

It should work now,
Code:
sed 's/^.\{16\}\(.\)\(.\)\(.\)\(.\)\(.\).*$/\1\n\2\n\3\n\4\n\5/' file | grep -c 'Y'


Selected from the character 17 to 21 as expected.
# 11  
Old 01-19-2010
Quote:
Originally Posted by thegeek
It is not because of grep. It is because of the characters which i have selected.

It should work now,
Code:
sed 's/^.\{16\}\(.\)\(.\)\(.\)\(.\)\(.\).*$/\1\n\2\n\3\n\4\n\5/' file | grep -c 'Y'


Selected from the character 17 to 21 as expected.
Right! Also with fold:

Code:
sed 's/^.\{16\}\(.\{5\}\).*$/\1/' a |fold -w 1 |grep -c 'Y'

methyl solution without the wc command is shorter:

Code:
cut -c17-21 filename|fold -w 1| grep -c 'Y'

# 12  
Old 01-19-2010
Thanks everyone for your suggestions... all of them worked
# 13  
Old 01-19-2010
People, people, people. Can we please stop the process forking insanity? There's only one sane way to approach this problem:

Code:
$ cat ydata
1234567890123456789012345
BBBBBBYBBBBYBBYBBYBBYBBBB
BBBBBBYBBBBYBBYBBBBBYBBBB
BBBBBBYBBBBYBBYBYBBBBBBBB

$ i=0; IFS=Y; while read x; do set ${x:16:5}.; ((i+=$#-1)); done < ydata; echo $i
4

Smilie

Cheers,
Alister
Last edited by alister; 01-19-2010 at 09:18 PM.. Reason: changed variable name for readability
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