Grep only gids from /etc/passwd

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I want to grep only group IDs from /etc/passwd. Now I only came up how to grep the names, with:



grep -oE '^[^:]+' /etc/passwd


which gives me:



[frynio@manjaro ~]$ grep -oE '^[^:]+' /etc/passwd
root
nobody
dbus
bin
daemon
mail
ftp
http
systemd-journal-remote
systemd-coredump
uuidd
dnsmasq
rpc
usbmux
avahi
colord
cups
deluge
git
lightdm
nm-openconnect
nm-openvpn
ntp
polkitd
frynio


How can I change this regex, to omit the first three :s and then start matching with [^:]+? (cuz the ^ before it matches the beginning of the line, that's why I can extract the names, and I want something to match the position after 3 colons)






linux grep






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    up vote
    0
    down vote

    favorite












    I want to grep only group IDs from /etc/passwd. Now I only came up how to grep the names, with:



    grep -oE '^[^:]+' /etc/passwd


    which gives me:



    [frynio@manjaro ~]$ grep -oE '^[^:]+' /etc/passwd
    root
    nobody
    dbus
    bin
    daemon
    mail
    ftp
    http
    systemd-journal-remote
    systemd-coredump
    uuidd
    dnsmasq
    rpc
    usbmux
    avahi
    colord
    cups
    deluge
    git
    lightdm
    nm-openconnect
    nm-openvpn
    ntp
    polkitd
    frynio


    How can I change this regex, to omit the first three :s and then start matching with [^:]+? (cuz the ^ before it matches the beginning of the line, that's why I can extract the names, and I want something to match the position after 3 colons)






    linux grep






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I want to grep only group IDs from /etc/passwd. Now I only came up how to grep the names, with:



      grep -oE '^[^:]+' /etc/passwd


      which gives me:



      [frynio@manjaro ~]$ grep -oE '^[^:]+' /etc/passwd
      root
      nobody
      dbus
      bin
      daemon
      mail
      ftp
      http
      systemd-journal-remote
      systemd-coredump
      uuidd
      dnsmasq
      rpc
      usbmux
      avahi
      colord
      cups
      deluge
      git
      lightdm
      nm-openconnect
      nm-openvpn
      ntp
      polkitd
      frynio


      How can I change this regex, to omit the first three :s and then start matching with [^:]+? (cuz the ^ before it matches the beginning of the line, that's why I can extract the names, and I want something to match the position after 3 colons)






      linux grep






      share













      I want to grep only group IDs from /etc/passwd. Now I only came up how to grep the names, with:



      grep -oE '^[^:]+' /etc/passwd


      which gives me:



      [frynio@manjaro ~]$ grep -oE '^[^:]+' /etc/passwd
      root
      nobody
      dbus
      bin
      daemon
      mail
      ftp
      http
      systemd-journal-remote
      systemd-coredump
      uuidd
      dnsmasq
      rpc
      usbmux
      avahi
      colord
      cups
      deluge
      git
      lightdm
      nm-openconnect
      nm-openvpn
      ntp
      polkitd
      frynio


      How can I change this regex, to omit the first three :s and then start matching with [^:]+? (cuz the ^ before it matches the beginning of the line, that's why I can extract the names, and I want something to match the position after 3 colons)






      linux grep




      linux grep





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      asked 4 mins ago









      Frynio

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