“Host key verification failed” means that the host key of the remote host was changed.
On the internet you will find plenty of tools for checking disk space utilization in Linux. However, Linux has a strong built in utility called ‘df‘. The ‘df‘ command stand for “disk filesystem“, it is used to get full summary of available and used disk space usage of file system on Linux system.
Use chown to change ownership and chmod to change rights.
use the -R option to apply the rights for all files inside of a directory too.
Note that both these commands just work for directories too. The -R option makes them also change the permissions for all files and directories inside of the directory.
sudo chown -R username:group directory will change ownership (both user and group) of all files and directories inside of directory and directory itself.
sudo chown username:group directory will only change the permission of the folder directory but will leave the files and folders inside the directory alone.
you need to use sudo to change the ownership from root to yourself.
Note that if you use chown user: file (Note the left-out group), it will use the default group for that user.
Also You can change the group ownership of a file or directory with the command:
chgrp group_name file/directory_name You must be a member of the group to which you are changing ownership to.
You can find group of file as follows
# ls -l file -rw-r–r– 1 root family 0 2012-05-22 20:03 file
# chown sujit:friends file User 500 is just a normal user. Typically user 500 was the first user on the system, recent changes (to /etc/login.defs) has altered the minimum user id to 1000 in many distributions, so typically 1000 is now the first (non root) user.
What you may be seeing is a system which has been upgraded from the old state to the new state and still has some processes knocking about on uid 500. You can likely change it by first checking if your distro should indeed now use 1000, and if so alter the login.defs file yourself, the renumber the user account in /etc/passwd and chown/chgrp all their files, usually in /home/, then reboot.
But in answer to your question, no, you should not really be worried about this in all likelihood. It’ll be showing as “500” instead of a username because o user in /etc/passwd has a uid set of 500, that’s all.
Also you can show your current numbers using id i’m willing to bet it comes back as 1000 for you.
On Linux instances, if you want to automatically mount volumes on instance boot, you need to set some specific options in the /etc/fstab file, or the instance may fail to launch. This applies to both iSCSI and paravirtualized attachment types.
To summarize then, the best way to list anything out in Linux is to remember the following ls commands:
After learning how to mount devices using Linux <www.lifewire.com/how-to-mount-dvds-and-cd-roms-using-ubuntu-4075034>, you may want to see a list of the mounted devices. This guide will show you how to list the devices, drives, PCI devices <www.lifewire.com/what-is-pci-2640242>, and USB devices <www.lifewire.com/universal-serial-bus-usb-2626039> on your computer. For finding out which drives are available, you will briefly be shown how to show the mounted devices and how to show all the drives.