计算文件中2个字符串之间匹配的行数

Question

I have a challenge. I have this text:

characteristic "type"
   value "A"
   value "B"
   value "C" 
   default-value "B" 
exit 
characteristic "active"
   value "no"
   value "yes"
   default-value "no" 
exit
characteristic "traffic"
   value "disabled" 
   value "enabled"
   default-value "enabled"
exit
characteristic "quota" 
   value "enabled"
   default-value "disabled"
exit
characteristic "redirect"
   value "disabled"
   value "enabled"
   default-value "disabled"
exit

I want to know how many times is word 'value' between 'characteristic' and 'exit'. So, I hope something like this:

3
2
2
1
2

I tried to used sed and grep but I cannot get sed give me back nth ocurrence of '-n -e "/^characteristic/,/^exit/ p"'. I'm sure bash can do it without a lot of do while/done and if .

I appreciate your help.

Answer 1

I'd say:

awk '$1 == "characteristic" { ctr = 0 } $1 == "exit" { print ctr } $1 == "value" { ++ctr }' filename

Very simply:

$1 == "characteristic" { ctr = 0 }  # Start of a new section: reset counter
$1 == "exit" { print ctr }          # end of section: print counter
$1 == "value" { ++ctr }             # value line: increase counter

Answer 2

I decided to try to solve this with GNU sed's e command.

This allows those familiar with sed to inline shell commands to do things like count words.

The idea was to condense each section to one line, and pass it to grep -ow value | wc -l grep -ow value | wc -l to count the occurrences of the word "value."

Command: sed -f char.sed input-file

Where the char.sed command file for sed is:

:a
/exit/{
  s/\n/ /g
  s/-/b/g
  s/^/echo /
  s/$/ | grep -ow value | wc -l/
  e
  n
}
N
ba

What that does is N on each line until /exit/ at which point newlines are replaced with spaces, dashes are replaced with b (so that "default-value" doesn't match grep -w value ). Then the entire line is prefaced with echo and suffixed with | grep -ow value | wc -l | grep -ow value | wc -l | grep -ow value | wc -l . The e command is then used to execute the command as constructed and stick the output of the command in the output stream.