How can Linux count the number of keywords in a log file?

In Linux, you can use the grep command to count the occurrences of keywords in a log file.

The grammar is as follows:

grep -o "关键字" 文件名 | wc -l

Among the options:

1. The option “o” indicates to only output the matched keywords.
2. “The keyword is the key word you want to count.”
3. The file name is the name of the log file that you want to count.
4. It is a pipe symbol that passes the output of the grep command to the wc command.
5. The command “wc -l” is used to count the number of lines in a file.

For example, if you want to count the number of occurrences of the keyword “error” in the log file access.log, you can execute the following command:

grep -o "error" access.log | wc -l

This will output the number of key errors in the log file.