fgrep:tldr:1e943

The command "fgrep -x ${filename1} ${filename2}" is used to search for an exact string match in a specified file.

Here's the breakdown of each component:

• "fgrep" stands for "fixed-string grep". It is a command-line tool used to search for fixed strings instead of regular expressions.
• "-x" is an option that ensures that the search pattern matches only whole lines. It specifies an exact match for the entire line.
• "${filename1}" and "${filename2}" are variables representing the file names you want to search in. You would replace them with the actual file names or their respective paths.

So, when you run this command, it will search for lines in ${filename2} that exactly match the contents of ${filename1}. The search is performed using exact string matching for the entire line, and the matching lines will be displayed as the output.