Is there any way under linux/terminal to count, how many times the char f occurs in a plain text file?
+4
A:
echo $(cat <file> | wc -c) - $(cat <file> | tr -d 'A' | wc -c) | bc
where the A is the character
Vereb
2009-10-21 21:05:35
This gets about a third faster if you take out the unnecessary `cat` s, giving the filename as an argument to `wc` and `tr`.
Jefromi
2009-10-21 21:49:00
unfortunately tr works only on the standard input
Vereb
2009-10-21 21:52:26
If you realy want to optimize this reads the file just once: echo $(stat -c%s <file>) - $(cat <file> | tr -d 'A' | wc -c) | bc
Vereb
2009-10-21 22:01:15
+1
A:
tr -d '\n' < file | sed 's/A/A\n/g' | wc -l
Replacing the two occurrences of "A" with your character, and "file" with your input file.
tr -d '\n' < file: removes newlinessed 's/A/A\n/g: adds a newline after every occurrence of "A"wc -l: counts the number of lines
Example:
$ cat file
abcdefgabcdefgababababbbba
1234gabca
$ tr -d '\n' < file | sed 's/a/a\n/g' | wc -l
9
Rob Hruska
2009-10-21 21:19:31
+7
A:
How about this:
fgrep -o f <file> | wc -l
Note: Besides much easier to remember/duplicate and customize, this is about three times (sorry, edit! botched the first test) faster than Vereb's answer.
Jefromi
2009-10-21 21:37:18
Yours is pretty cool, though. I had fun reading it and seeing how it worked.
Jefromi
2009-10-21 21:42:27
A:
Although this topic is dead, I'd like to point out that
grep -c 'f' myfile
would also work
Jongo the Gibbon
2010-05-10 23:43:40