I got the error ‘ef command not found’ on my CentOS 7 server. ef command on centOS server is provided by the package ElectricFence. ElectricFence (efence malloc debugger) is a debugger which detects memory allocation violations on your Linux Server.

ElectricFence uses the virtual memory of your server to detect when software overruns the boundaries of a malloc() buffer.

Efence can be installed either by using yum command or by downloading the rpm package from CentOS repositories. Do the below steps to install ElectricFence on your CentOS 7 server.

1. Log into Linux Server as ‘root’ user

2. Run the command ‘yum install ElectricFence’ to install ElectricFence on your Linux Server

Alternate way to Install :

1. You must log into CentOS 7 server as ‘root’ user

2. Search the rpm file of ElectricFence in rpmfind.net website

https://rpmfind.net/linux/rpm2html/search.php?query=ElectricFence
 

3. After that download the rpm file using wget command

# wget https://rpmfind.net/linux/centos/7.6.1810/os/x86_64/Packages/ElectricFence-2.2.2-39.el7.i686.rpm
 

4. Install the rpm file downloaded

# rpm -Uvh ElectricFence-2.2.2-39.el7.i686.rpm
 

5. To verify, just type ‘ef’ on the terminal

# ef
/usr/bin/ef: Usage: ef [executable] [arguments].
Runs the executable under the Electric Fence malloc debugger.