TLDR
Enter a command. For example: parquet tools, ebook convert.

who

 
Display who is logged in and related data (processes, boot time). More information: https://www.gnu.org/software/coreutils/who.
 
  • Display the username, line, and time of all currently logged-in sessions:
     
    who
     
  • Display information only for the current terminal session:
     
    who am i
     
  • Display all available information:
     
    who -a
     
  • Display all available information with table headers:
     
    who -a -H
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