Sum a column with awk

More linux commands

• Delete lines matching pattern
  sed -i '/^#/d' config.confcopy

  Remove all comment lines starting with #

• Multi-line sed replacement
  sed -n '/START/,/END/p' file.txtcopy

  Print block of text between START and END markers

• Unique sorted values
  sort file.txt | uniq -c | sort -rncopy

  Count occurrences of each unique line

• Show users logged in
  who -H && wcopy

  Active user sessions and what they are running

• Last logins
  last -n 20 | head -25copy

  Last 20 login records with IP and duration

all 133 linux commands →