Useful Linux commands for getting uptime and other information.

Posted: May 30, 2017. At: 1:13 PM. This was 5 months ago. Post ID: 10779

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)

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