To find a file containing a particular text string on a Linux server, you can use the grep command.
The grep command searches files for a specified pattern and displays the lines that contain the pattern.
For example, to search for the text string hello in all files in the current directory, you can use the following command:
grep hello *
This will search all files in the current directory for the text string hello and display any matches.
You can also use the -r option to search recursively through subdirectories. For example:
grep -r hello .
This will search the current directory and all subdirectories for the text string hello and display any matches.
You can also use the -l option to display only the names of the files that contain the text string, rather than the lines that contain the text. For example:
grep -l hello *
This will search all files in the current directory for the text string hello and display the names of the files that contain the text.
You can use various other options to customize the grep command, such as the -i option to ignore case, or the -n option to display line numbers.
For a complete list of options and more information about using the grep command, you can use the --help option. For example:
grep --help
This will display a list of all available options and their descriptions.
It's important to note that the grep command can be slow when searching large numbers of files, especially if you are searching recursively through subdirectories. If you are searching a very large number of files, you may want to consider using an alternative tool such as ack or ag.