← Reading the Manual (man pages)
Get the one-line summary
Learn
Just the one-line summary
When you only want a reminder of what a command does, whatis prints the NAME summary
without the whole page:
whatis grep # grep (1) - print lines that match patterns
Notice the (1) after the name. It isn't decoration: it's the section of the manual
the page lives in, and the next step is about what that means.
Your task
For a quick reminder without the whole page, whatis prints just the summary line. Run whatis ls — note the (1): that's the manual section the page lives in.