Uly.me

cloud engineer

remove

Remove Sudo Password

Removing sudo password is typically not a good practice. If you’re a seasoned system administrator, or you’re the only one using your own desktop, being prompted for a sudo password can get really annoying. Here’s how to stop getting prompted every time you run sudo.

Run visudo. 

sudo visudo

Edit the sudo line and set to below.

%sudo ALL=(ALL) NOPASSWD: ALL

Save file.

Remove Quotes From Strings

Here’s the command to remove quotes from a string in Bash by using the tr -d command. I’m using jq tool to extract the access key from a json file. Bash returns a string surrounded by quotes. To remove the quotes, just pipe the string to the tr -d command.

jq .AccessKey.AccessKeyId key.json

Result:

"ASDFSDFSDFASDFSDFSDFGHGDF"

Using tr -d.

jq .AccessKey.AccessKeyId key.json | tr -d \"

Result:

ASDFSDFSDFASDFSDFSDFGHGDF

How To Remove Snap

Snap is cool, but not for everyone. To remove, follow these steps.

# get list
snap list
# remove snaps. repeat for each app.
snap remove chromium
# remove snapd
apt purge snapd
# remove snap from home
rm -rf ~/snap
# clean up cache
rm -rf /var/cache/snapd
apt purge snapd

Removing Old Kernels

How to check which kernel is running on your system

uname -sr

List all kernels installed on the system.

rpm -q kernel

Removing old kernels using package-cleanup. This keeps 2 kernels on the system.

yum install yum-utils
package-cleanup --oldkernels --count=2