Another way is:
grep -cvP '\S' file
-P '\S'(perl regex) will match any line contains non-space-vselect non-matching lines-cprint a count of matching lines
If your grep doesn’t support -P option, please use -E '[^[:space:]]'
Another way is:
grep -cvP '\S' file
-P '\S'(perl regex) will match any line contains non-space-v select non-matching lines-c print a count of matching linesIf your grep doesn’t support -P option, please use -E '[^[:space:]]'