If you are a Windows user, press the keys Windows-R simultaneously to open the Run window, then you can use the help command to get some information on any command, e.g., help taskkill, help dir, or help date. The forward slash (/) is used to execute a command option or perform a switch, the question mark (?) is for the help switch in particular, e.g., ipconfig /?, systeminfo /? or attrib /?
Other ways to get some help and find solutions to problems in Windows are: Microsoft Support. The Get Help app: Just type Get Help on the taskbar and then type your doubt or problem in the search box. Use Windows Troubleshooters: Settings, System, Troubleshoot, Other troubleshooters.
If you are a macOS or GNU/Linux user:
[username@hostname cwd]$ paccache -h paccache v1.5.3 A flexible pacman cache cleaning utility. Usage: paccache
[options] [targets...]Operations: -d, --dryrun perform a dry run, only finding candidate packages. -m, --move move candidate packages to "dir".-r, --remove remove candidate packages. Options: --min-atime --min-mtime than the time given, even if this means keeping more than specified through the '--keep' option. Accepts arguments according to 'info "Date input formats"', e.g. '30 days ago'. -a, --arch scan for "arch" (default: all architectures).[...]
[username@hostname cwd]$ whatis ps ps (1) - report a snapshot of the current processes. [username@hostname cwd]$ whatis surfraw surfraw (1) - a fast unix command line interface to WWW services
When you are reading a man page, remember: / search_string, find matches to “search_string”; n go to the next match; and type q to quit or exit.