Show the Top 10 Largest Directories on Linux
If you need to see the top 10 largest directories on your Linux system, you can use the following command:
du -h --max-depth=1 / | sort -rh | head -n …Linux
50 articles about linux development, tools, and best practices
How to set the Hostname on a Linux server with Terraform
If you need to set the hostname on a linux server, and you are using Terraform, then you can do the following:
Include the provisioner block and set …
How to Change a MariaDB/MySQL Data Directory to a New Location on Linux
Step 1 — Moving the MariaDB Data Directory
mysql -u root -p
select @@datadir;
Output:
+-----------------+
| @@datadir | …How to update NTP to sync clock on Linux
If you need to sync the clock on Linux using the central NTP clock service, you can do the following:
sudo service ntp stop
sudo ntpd -gq
sudo service …Understanding the Network Modes in AWS ECS
If using the EC2 launch type, the allowable network mode depends on the underlying EC2 instance’s operating system. If Linux, awsvpc, bridge, host and …
Read Article →AppMesh and ECS with Imported ACM certificates on Envoy Sidecar through EFS
Summary
This guide showcases the ability to use imported certificates from a third party provider (e.g. Venafi) in ACM, mount them in EFS and use them …
Read Article →How to Check if a Volume is Mounted in Bash
If you need to check if a volume is mounted in a Bash script, then you can do the following.
How to Check Mounted Volumes
First we need to determine …
Read Article →How to Determine if a Bash Variable is Empty
If you need to check if a bash variable is empty, or unset, then you can use the following code:
if [ -z "${VAR}" ];
The above code will check …
Read Article →How to Order by File Size using the du command in Linux
If you use the du command to list all the file sizes on Linux:
du
# or
du -h # Human readable
Then you would have noticed that they are not ordered by …
Read Article →How to Resize an AWS EBS Volume in Bash
If you need to resize an EBS volume in AWS, you can do so using bash.
Step 1 – Create a bash file
Create a bash file called resize.sh:
#!/bin/bash …How to Count Files in Directory on Linux
If you need to count how many files are in a directory on Linux, then you can use a combination of the ls command to list all the files, and the wc …
How to Execute Linux Commands in Golang
If you want to execute Linux commands in Golang, you can use exec.Command from the os/exec package:
cmd := exec.Command("echo", "hello …How to get CPU Frequency in Linux
If you need to get the CPU frequency in Linux, you can run the following command:
watch -n.1 "grep \"^[c]pu MHz\" /proc/cpuinfo"
This …
Read Article →How to Exit if a Bash Variable in Not Set
Sometimes you might want to exit a command if a variable is not set in Bash.
You can do this as follows:
if [ -z "$VARIABLE_NAME" ]; then echo …How to Check OS version and flavor in Linux
If you need to check the version and flavour of the running Linux instance, then you can try the below commands:
cat /etc/os-release
lsb_release -a …How to Save sed Output Directly to a File
You have 3 options here:
I needed this when doing bulk find-and-replace across config files in a deployment script. The -i option is the most common …
How to Bulk Move All Email from One Account to Another using the CLI
If you find yourself in a position where you need to sync all emails from one account to another, then you can use the imapsync command-line tool to …
How to Install AWS CLI on Linux
You can download and install the AWS CLI v2 on Linux as follows. This works on most x86_64 Linux distributions including Ubuntu, Amazon Linux, and …
Read Article →How to Reboot Networking on Mac from CLI
If you need to reboot, or restart the networking interface on your Mac, by using the CLI, then you can issue the following commands:
Using the …
Read Article →[Solved] ZipArchive extension: disabled/not installed on Ubuntu
If you have come across the following error:
ZipArchive extension: <strong>disabled/not installed</strong>
This just means that …
Read Article →How to Change the Timestamp of a File on Mac/Linux
If you have a file on your machine, and you want to change the created/modified time/date stamp, then you can use the touch command.
touch -t …How to get Meta-Data information from an AWS EC2 Instance
If you need to query meta-data information from your running EC2 instance, you can curl the following location:
curl …How to List all Running Services on Ubuntu
If you need to view a list of all the services that are either running or stopped (or both) on an Ubuntu server, then you can use the following …
Read Article →How to Upgrade an Ubuntu Server
Upgrading an Ubuntu Server is quite easy, just follow the below commands:
Option 1: Tldr; (just run the below!)
sudo apt-get update && sudo …