1. Open the file with vi or vim
How to find keywords in vi and vim editing mode in Linux:
1. Enter vi. In editing mode, first press "esc" on the keyboard to jump to command input mode.
2. Enter the slash "/", then the screen will jump to the bottom and "/" will appear in the input field.
3. Enter the keyword you need to find and press Enter.
4. If you want to continue searching for the next keyword, enter n
5. To find the previous keyword, enter N (capital)
2. The cat-- file is in the current folder directory and has not been opened.
cat filename | grep "keyword"
3. If gerp is to search for keywords contained in the content in multiple files in a certain directory,
grep -r "keyword" directory