How can I search for document contents in Linux?

In Linux, you can use the grep command to search for content within documents. This command is used to search for specific patterns of text in files and print out the matching lines.

The grammar is as follows:

grep [选项] 模式 文件名

For example, to search for lines containing the keyword “search_term” in the file example.txt, you can use the following command:

grep "search_term" example.txt

The grep command also supports searching using regular expressions. For example, to search for words that start with the letter “a”, you can use the following command:

grep "^a" example.txt

The grep command has many options that can be adjusted as needed. You can refer to the complete grep command documentation by using the man grep command to get more information.