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grep -c $'\r\n' file returns the exact same number as grep -c $'\n' file, it shows the number of LF in the file instead of the number of CRLF. (The file definitely does not contain that number of CRLF.) How can I determine the exact number of CRLF occurrences?

I've tried the following commands, none of them return the right number:

grep -c $'\r\n' file
grep -c $"\r\n" file
grep -c '\r\n' file
grep -c "\r\n" file
  • Why not grep -c "\r\n" file ? – Costas Jan 18 '15 at 12:41
  • Tried various combinations of with and without the dollar sign, and using single or double quotes, none of them return the right number. – user779159 Jan 18 '15 at 12:55
  • Try grep -c "^M$" sample.txt (Note that ^M is Ctrl+v,Ctrl+m) – Costas Jan 18 '15 at 14:41
5

The pattern argument to grep is in fact a newline-separated list of patterns. Thus grep $'\r\n' searches either a CR or the empty pattern (which matches every line). This is the same as grep $'\n' which searches the empty pattern or the empty pattern.

To search for a CRLF sequence, search for a CR at the end of the line.

grep -c $'\r$' file
  • With the tiny exception of files where last byte is a \r. – user367890 Jan 18 '15 at 23:39
  • 2
    @user367890 If the last byte isn't a newline then the file isn't a text file, so the behavior depends on the grep implementation. With GNU grep, grep $'\r$' does find a CR at the end of the file. – Gilles Jan 18 '15 at 23:42

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