Installing Leiningen

Linux RHEL 7 & CentOS 7

Downloading Leiningen

Create a directory and download Leiningen:

$ mkdir -p /opt/lein/bin
$ cd /opt/lein/bin
$ wget https://raw.githubusercontent.com/technomancy/leiningen/stable/bin/lein

Add execute permissions to downloaded file:

$ chmod +x lein

Run lein, will download some dependencies, maybe take a few minutes:

$ ./lein run

Configuring Environment Variables

In order to run lein in our bash, CentOS and RHEL provides of /etc/profile.d/ directory for customizing environment variables per application:

# echo "export LEIN_HOME=/opt/lein/" >> /etc/profile.d/lein.sh
# echo "export LEIN=$LEIN_HOME/bin" >> /etc/profile.d/lein.sh
# echo "export PATH=\$PATH:\$LEIN" >> /etc/profile.d/lein.sh
# source /etc/profile.d/lein.sh

Running lein

To probe lein, run in a new terminal:

$ lein relp  
nREPL server started on port 35001 on host 127.0.0.1 - nrepl://127.0.0.1:35001
REPL-y 0.3.7, nREPL 0.2.12
Clojure 1.8.0
Java HotSpot(TM) 64-Bit Server VM 1.8.0_144-b01
    Docs: (doc function-name-here)
          (find-doc "part-of-name-here")
  Source: (source function-name-here)
 Javadoc: (javadoc java-object-or-class-here)
    Exit: Control+D or (exit) or (quit)
 Results: Stored in vars *1, *2, *3, an exception in *e

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