Touch Access And Modify Times Individually
When running the touch command on an existing file:
$ touch README.md
The Access and Modify times of that file will be updated to the current
time.
You can update these values individually with the -a and -m flags.
To update just the access time:
$ touch -a README.md
To update just the modify time:
$ touch -m README.md
See man touch for more details.