To count just the total number of lines that a file contains in Linux, use the "wc" command with the "-l" option.

Explanation of the options provided:

• wc -l: Counts the number of lines in the specified file.
• wc -c: Counts the number of bytes in the specified file.
• wc -w: Counts the number of words in the specified file.
• wc -r: Recursively counts lines, words, and characters in directories.