Do you need to include timestamps in grep-O?
You will need to discard the timestamps, but ‘grep’ and ‘sort –unique’ together can do it for you. So grep -o will only show the parts of the line that match your regex (which is why you need to include the .* to include everything after the “Validating Classification” match).
How to use Linux-grep inside files within date range?
(Note that the -0 flag is there to let this command operate on files with embedded spaces, such as this is my filename .) When you provide multiple expressions to find, they are ANDed together. E.g., if you ask for: find will only return files that are both (a) named foo and (b) larger than 10 kbytes.
How to grep lines that have the current date?
Right now, as written, you are searching for the word date in two different files ( +”20%Y-%m-%d”, and general.log ). Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers.
When to use ctime or Mtime in grep?
The “ctime” timestamp is rarely of any use. Some backup software changes it after backing up files. It also changes if you change the permissions of the file. Stick to “mtime” for this purpose. Anything between single quotes ‘ ‘ is just a fixed string. You probably intended to type backticks ` ` to ask the Shell to execute the command.
How to get the unique list of errors in grep?
So grep -o will only show the parts of the line that match your regex (which is why you need to include the .* to include everything after the “Validating Classification” match). Then once you have just the list of errors, you can use sort -u to get just the unique list of errors.
How to count the number of times a search term appears in grep?
We can make grep count for us in different ways. If we want to know how many times a search term appears in a file, we can use the -c (count) option. grep reports that the search term appears 240 times in this file. You can make grep display the line number for each matching line by using the -n (line number) option.