Bash script meant to easily change the version of `solc` that comes packaged with Truffle when you install it globally

solc-changer

#!/bin/bash
# ------------------------------------------------------------------
# [GNSPS] Truffle's solc version changer
# 
#          Bash script to change the version of the solc the
#          Truffle module comes packaged with. 
#          
#          
# Installation: save this file as
# 
# 					'solc-changer'
#      
# 				then run
#     
#     				'chmod u+x solc-changer'
#         
#     			and copy it to somewhere in your $PATH
#        		which in mac OS is simply:
#          
#          			'mv solc-changer /usr/local/bin/solc-changer'
#        
# 				and finally run it with the version argument like:
#     			
#        		$ solc-changer 0.4.11
#         
# ------------------------------------------------------------------

VERSION=0.0.1
SUBJECT=truffle-solc-changer
USAGE="v$VERSION\n\nUsage: $0 <desired_solc_version>"
CURR_PWD=$(pwd)

# --- Options processing -------------------------------------------
if [ $# == 0 ] ; then
    echo -e $USAGE
    exit 1;
fi

param1=$1

# --- Locks -------------------------------------------------------
LOCK_FILE=/tmp/$SUBJECT.lock
if [ -f "$LOCK_FILE" ]; then
   echo "Script is already running"
   exit
fi

trap "rm -f $LOCK_FILE" EXIT
touch $LOCK_FILE

# --- Body --------------------------------------------------------

cd $(npm config get prefix)/lib/node_modules/truffle/
npm install solc@$param1 --save
cd "$CURR_PWD"

# -----------------------------------------------------------------