last command in Linux is to check the last logged in Users, lastb is to check the failed log in users and lastlog is to check the recent logged in Users.
grep command in Linux is used to search the pattern in a file, search the whole line, exact match, exclude a word, search in directories.
tail command in Linux used to view the content of the last lines, to check the continuous logs on the server this command is very useful.
head command in Linux is used to display the content which is on the TOP, learn many options like -c, -v, and -n. Find the cheat sheet and play Quiz.
more command in Linux is used to view the content for the larger file, Also find the cheat sheet for the less command and play Quiz to check the grip.