c_rehash command not found

In this troubleshooting guide we learn how to fix c_rehash command not found error message

Introduction

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

c_rehash: command not found

or when using sudo you get the following error message

sudo: c_rehash: command not found

Solutions to c_rehash: command not found

How To Fix c_rehash: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu c_rehash is provided by openssl package.

openssl is:

This package is part of the OpenSSL project’s implementation of the SSL and TLS cryptographic protocols for secure communication over the Internet.

It contains the general-purpose command line binary /usr/bin/openssl, useful for cryptographic operations such as:

  • creating RSA, DH, and DSA key parameters;
  • creating X.509 certificates, CSRs, and CRLs;
  • calculating message digests;
  • encrypting and decrypting with ciphers;
  • testing SSL/TLS clients and servers;
  • handling S/MIME signed or encrypted mail.

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

sudo apt-get -y install openssl

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

You can also use apt command to install openssl.

sudo apt -y install openssl

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

sudo aptitude install openssl

Summary

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