Description of problem:
[root@camden root]# ls /opt/resin 
2.1.10  2.1.20  2.1.300  2.1.4  2.1.40
[root@camden root]# /bin/ls -d /opt/resin/* | sort -r | head -1
/opt/resin/2.1.40
[root@camden root]# 

It should have picked '2.1.300'.

It needs to be doing a numeric sort on the 3rd field, and only look
for files named 2.1.x 

Something like the following adapted code should work:

/bin/ls -d /opt/resin/2.1.* | sort -t . -k 3 -n -r | head -1

This is also relevant for tomcat.

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