I was wondering how to count the number of a specific character in each line by some text processing utilities?
For example, to count " in each line of the following text
"hello!"
Thank you!
The first line has two, and the second line has 0.
Another example is to count ( in each line.
You can do it with sed and awk:
$ sed 's/[^"]//g' dat | awk '{ print length }'
2
0
Where dat is your example text, sed deletes (for each line) all non-" characters and awk prints for each line its size (i.e. length is equivalent to length($0), where $0 denotes the current line).
For another character you just have to change the sed expression. For example for ( to:
's/[^(]//g'
Update: sed is kind of overkill for the task - tr is sufficient. An equivalent solution with tr is:
$ tr -d -c '"\n' < dat | awk '{ print length; }'
Meaning that tr deletes all characters which are not (-c means complement) in the character set "\n.
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