Useful Linux commands for getting uptime and other information.

Posted: May 30, 2017. At: 1:13 PM. This was 8 months ago. Post ID: 10779
Page permalink.
WordPress uses cookies, or tiny pieces of information stored on your computer, to verify who you are. There are cookies for logged in users and for commenters. These cookies expire two weeks after they are set.

Very useful Linux commands

Another way to get the uptime of the system.

awk '{printf("Uptime: %d:%02d days, %02d minutes, %02d seconds.\n",($1/60/60/24),($1/60/60%24),($1/60%60),($1%60))}' /proc/uptime

Find the actual device name of the drive that contains your root partition.

ip-172-31-20-16:~> findmnt -n -o SOURCE /
/dev/xvda1

Find the device name of a hard disk from the UUID identifier.

ip-172-31-20-16:~> findfs UUID=ee515a1e-7735-4529-822f-4cc9e7632cd3
/dev/xvda1

How to get the total disk space on your root partition and the free space as well.

ip-172-31-20-16:~> df -h --total /
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       30G   26G  2.6G  92% /
total            30G   26G  2.6G  92% -

This command will show the amount of disk space in megabytes that a directory takes up.

ip-172-31-20-16:~> du -ack -BM /boot | tail -n 2
270M    /boot
270M    total

How to get just the IP address of a website with one useful Linux command.

ip-172-31-20-16:~> dig google.com.au a +short
216.58.199.35

It is possible in a few ways, to get the filesystem type of a partition with a simple command. I am getting it with the df command.

localhost% df -BM -T /dev/mapper/fedora-root
Filesystem              Type 1M-blocks   Used Available Use% Mounted on
/dev/mapper/fedora-root ext4   234550M 94357M   128256M  43% /

The file command may also be used to get information about the filesystem on a partition.

[root@localhost jason]# file -sL /dev/mapper/fedora-root
/dev/mapper/fedora-root: Linux rev 1.0 ext4 filesystem data, UUID=0fb483da-17ac-45a9-a665-9becb78210f3, volume name "Fedora" (needs journal recovery) (extents) (64bit) (large files) (huge files)

No comments have been made. Use this form to start the conversation :)

Leave a Reply