cloud engineer
Here’s how to run Rocky Linux in a Docker container.
Download the image.
docker pull rockylinux/rockylinux |
docker pull rockylinux/rockylinux
Create a Rocky Linux container called bullwinkle.
docker run -it --name bullwinkle -d rockylinux/rockylinux |
docker run -it --name bullwinkle -d rockylinux/rockylinux
Login to the container using bash.
docker exec -it --user root bullwinkle /bin/bash |
docker exec -it --user root bullwinkle /bin/bash
When done, stop and delete the container.
docker ps -a docker stop container_ID docker rm container_ID |
docker ps -a docker stop container_ID docker rm container_ID
Here’s the command to create a Linux user with a specific user id and group id.
sudo groupadd -r -g 1234567 username sudo useradd -r -u 1234567 -g 1234567 -m -d /home/username -s /bin/bash nexus -c "my new account" |
sudo groupadd -r -g 1234567 username sudo useradd -r -u 1234567 -g 1234567 -m -d /home/username -s /bin/bash nexus -c "my new account"
There are times you just want to print directly from the command line.
# check your printing options lpotions lpinfo -v # what's your default printer lpinfo -p -d # use lp to print lp notes.txt # use -n print multiple copies lp -n 2 notes.txt # check the printer queue lp -q # use the job number to cancel print jobs if needed cancel 123 |
# check your printing options lpotions lpinfo -v # what's your default printer lpinfo -p -d # use lp to print lp notes.txt # use -n print multiple copies lp -n 2 notes.txt # check the printer queue lp -q # use the job number to cancel print jobs if needed cancel 123
Here’s my favorite Linux prompt.
PS1='\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ ' |
PS1='\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
Add to end of your .bashrc to make it permanent.
Here’s how to sync files between two directories, while copying only new files and ignoring existing files.
rsync --ignore-existing -rapzvh /dir1 /dir2 >> /root/rsync.log & |
rsync --ignore-existing -rapzvh /dir1 /dir2 >> /root/rsync.log &
Here’s how to view the contents of a tar file without extracting the files.
tar -tvf file.tar |
tar -tvf file.tar
Here’s how to get the size of a directory.
du -sh /var/www |
du -sh /var/www
Output:
2.1GB /var/www |
2.1GB /var/www
Size of the directories and files one level down.
du -sh /var/www/* |
du -sh /var/www/*
Sort with biggest files from top to bottom.
du -sh /var/www/* | sort -rh |
du -sh /var/www/* | sort -rh
Top 5 biggest files from top to bottom.
du -sh /var/www/* | sort -rh | head -5 |
du -sh /var/www/* | sort -rh | head -5
How to install Docker on Linux Mint or Ubuntu.
sudo apt-get install docker-ce docker-ce-cli containerd.io docker --version |
sudo apt-get install docker-ce docker-ce-cli containerd.io docker --version