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Variables

          $1      $2/$(NF-1)    $3/$NF
           ▼          ▼           ▼ 
        ┌──────┬──────────────┬───────┐
$0/NR ▶ │  ID  │  WEBSITE     │  URI  │
        ├──────┼──────────────┼───────┤
$0/NR ▶ │  1   │  quickref.me │  awk  │
        ├──────┼──────────────┼───────┤
$0/NR ▶ │  2   │  google.com  │  25   │
        └──────┴──────────────┴───────┘

# First and last field
awk -F: '{print $1,$NF}' /etc/passwd
# With line number
awk -F: '{print NR, $0}' /etc/passwd
# Second last field
awk -F: '{print $(NF-1)}' /etc/passwd
# Custom string 
awk -F: '{print $1 "=" $6}' /etc/passwd

See: Variables

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