Docker:  Stop all containers now!

Docker: Stop all containers now!

Docker has changed our world. A very useful component in the toolbox of any Software Engineer or perhaps, any forward-thinking company. What is Docker? Why Docker? and other questions relating to the topic starts here: Docker

Sometimes, you are just too annoyed with the state of your machine and need to stop all running containers, here is a simple command:

#stop all running docker containers
docker stop $(docker ps -a -q)
#remove all docker containers
docker rm $(docker ps -a -q)

Unfortunately, that’s still not enough for the lazy engineer, simply add this as an alias in your bash/zsh profile and then you can call that command in a consistent and easy manner.

#!/usr/bin sh 
#I am either .bashrc or .zshrc or .bash_profile or whatever profile you use
alias docker_stop_all='docker stop $(docker ps -a -q)'
alias docker_remove_all='docker rm $(docker ps -a -q)'

Hope this helps.

Bash:  Delete History in Terminal

Bash: Delete History in Terminal

Sometimes while working on the terminal or commandline as you know it, the history becomes clogged with simple common commands like ls -al and you want to remove X number of lines to keep your history compact and relevant.  Here’s a simple command that works:

for i in {1..total_count}; do history -d start_from; done

This deletes a total of total_count  amount of history starting from line number start_from in your history.   Make your Shell clean again!


for i in {1..40}; do history -d 1000; done


BigData at the Commandline

BigData at the Commandline

BigData and Agile seem not to be friendly in the past but that is no more the case.  One of the important points in processes data is data integrity.   Assuming you are pulling data from an API(Application Programming Interface) and performing some processing on the result before dumping as utf-8 gzipped csv files on  Amazon’s S3.  The task is to confirm that the files are properly encoded(UTF-8), each file has the appropriate headers, each row in each file do not have missing data and finally produce a report with filenames, column count, records count and encoding type.   There are many languages today and we can use any BUT speed is of great importance.  also, we want to have a Jenkins (Continuous Integration Server) job running.

I have decided to use Bash to perform these checks and will do it twice!  First, I will use basic Bash commands and then will use the csvkit (  The other tool in the mix is the AWS commandline tool(aws-cli)

Bash: List all files but ignore some

Bash: List all files but ignore some

On the commandline (terminal) in the *nix world, when you need to list all the files in a directory but ignore some based on file extension e.g. pdf, sh, tsv etc. Then the command below is quite appropriate. Remember to update the list of extensions you want to ignore i.e. “sh|tsv|rb|properties”

ls -l | grep -Ev '\.(sh|tsv|rb|properties)$' | column

Let me know if this is useful.