First you have to install NodeJS. You can do that via package manager for your distribution. In my case (RHEL) it is easily done with:

sudo yum install nodejs npm --enablerepo=epel

Installing CasperJS is easy via npm (Node package manager):

sudo npm install -g casperjs

You will get output similar to this:

Copying extracted folder /usr/lib/node_modules/casperjs/node_modules/phantomjs/phantomjs/phantomjs-1.9.7-linux-x86_64.tar.bz2-extract-1396259124118/phantomjs-1.9.7-linux-x86_64 -> /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom
Writing location.js file
Done. Phantomjs binary available at /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/phantomjs
/usr/bin/casperjs -> /usr/lib/node_modules/casperjs/bin/casperjs
npm WARN unmet dependency /usr/lib/node_modules/block-stream requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/fstream requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/fstream-ignore requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/fstream-npm requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/glob requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/npmconf requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /usr/lib/node_modules/tar requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
[email protected] /usr/lib/node_modules/casperjs
âââ [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected])
[[email protected] ~]$ casperjs
Fatal: [Errno 2] No such file or directory; did you install phantomjs?
[[email protected] ~]$ /usr/bin/casperjs
Fatal: [Errno 2] No such file or directory; did you install phantomjs?
[[email protected] ~]$ /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/phantomjs
phantomjs>
[[email protected] ~]$ /usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/phantomjs --version
1.9.7

To have the binaries in my path every time I log in I added this alias to my .bashrc:

alias phantomset="export PATH=$PATH:/usr/lib/node_modules/casperjs/node_modules/phantomjs/lib/phantom/bin/"

and my .bash_profile looks like this:

# User specific environment and startup programs
PATH=$PATH:$HOME/bin
export PATH
phantomset

Here I will post non standard and 'out of the ordinary' crontab settings. A note to myself (ANTM): crontab file in Centos is located in /etc/crontab. Lets start:

Run a cron job every 5 minutes but starting from minute 3.

Surely you can go about this like so:

3,8,13,18,23,28,33,38,43,48,53,58 * * * * /bin/mycommand

but there's much cleaner way of doing it:

3-59/5 * * * * /bin/mycommand

More info can be found on this Stack Overflow question and also another option is suggested here and goes like this:

*/5+3 * * * * /bin/mycommand

Similarly

Run a cron job every 5 minutes

*/5 * * * * /bin/mycommand