env_parallel.csh command not found

Introduction

When you run more command in linux terminal / console, you get the following error message

env_parallel.csh: command not found

or when using sudo you get the following error message

sudo: env_parallel.csh: command not found

Solutions to env_parallel.csh: command not found

How To Fix env_parallel.csh: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu env_parallel.csh is provided by parallel package.

parallel is:

GNU Parallel is a shell tool for executing jobs in parallel using one or more machines. A job is typically a single command or a small script that has to be run for each of the lines in the input. The typical input is a list of files, a list of hosts, a list of users, or a list of tables.

If you use xargs today you will find GNU Parallel very easy to use. If you write loops in shell, you will find GNU Parallel may be able to replace most of the loops and make them run faster by running jobs in parallel. If you use ppss or pexec you will find GNU Parallel will often make the command easier to read.

GNU Parallel also makes sure output from the commands is the same output as you would get had you run the commands sequentially. This makes it possible to use output from GNU Parallel as input for other programs.

To fix this problem, we can install more using the command below.

sudo apt-get -y install parallel

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install parallel.

sudo apt -y install parallel

Or if you have aptitude installed you can use the following command.

sudo aptitude install parallel

Summary

In this tutorial we learn how to fix env_parallel.csh command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.