sed is great for pattern matching or retrieving lines

sed is great for pattern matching or retrieving lines

Here is a cool example

Say you type df:

The output would be something like:

[quote:3bb8d51437]Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda2 1712432 1206664 418780 75% /
/dev/hda1 31201 10505 19085 36% /boot
none 30932 0 30932 0% /dev/shm
[/quote:3bb8d51437]

Say you want the second line only you could pipe the output of df to sed
(replace the 2 in '2p' to retrieve a different line)

[code:1:3bb8d51437] df | sed -n '2p'[/code:1:3bb8d51437]

This will return only the second line:

[quote:3bb8d51437]/dev/hda2 1712432 1206664 418780 75% /[/quote:3bb8d51437]


As you can see sed can be very powerful and this is just the beginning of what it can do



Tags:

sed, matching, retrieving, linessed, lineshere, df, output, bb, filesystem, mounted, dev, hda, shm, retrieve,

Latest Articles

  • Linux tftp listens on all interfaces and IPs by DEFAULT Security Risk Hole Solution
  • python import docx error
  • Cisco Unified Communications Manager Express Cheatsheet CUCME CME
  • Linux Ubuntu Debian Missing privilege separation directory: /var/run/sshd
  • bash how to count the number of columns or words in a line
  • bash if statement how to test program output without assigning to variable
  • RTNETLINK answers: Network is unreachable
  • Centos 7 how to save iptables rules like Centos 6
  • nfs tuning maximum amount of connections
  • qemu-kvm error "Could not initialize SDL(No available video device) - exiting"
  • Centos 7 tftpd will not work with selinux enabled
  • Debian Ubuntu Mint Howto Create Bridge (br0)
  • How To Control Interface that dhcpd server listens to on Debian based Linux like Mint and Ubuntu
  • LUKS unable to type password to unlock during boot on Debian, Ubuntu and Mint
  • Debian Ubuntu and Linux Mint Broken Kernel After Date - New Extra Module Naming Convention
  • Wordpress overwrites and wipes out custom htaccess rules and changes soluton
  • Apache htaccess and mod_rewrite how to redirect and force all URLs and visitors to the SSL / HTTPS version
  • python 3 pip cannot install mysql module
  • QEMU-KVM won't boot Windows 2016 or 2019 server on an Intel Core i3
  • Virtualbox vbox not starting