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$ echo "abc/def/gh/joe.txt" | awk -F"/" '{print $NF}'
joe.txt

Excellent point, thanks. I corrected my example above for future searchers.

A much easier way, and a way that can be handled in any shell not just BASH, is to use -z to check for blank variables.

if [ -z "$VARIABLE" ]
then
...
else
...
fi

The reason it always finds a PID is because it's finding the grep.

I don't have "bash" hand to try a fix but the "echo" is not needed or desirable (it introduces an extra line terminator which...

Also eliminate the grep -v grep and save a process by doing this:
LAN_VARIABLE=$(ps -ef | grep "[m]intty" | awk '{print $2}')Matches the string "mintty" but not itself, thus eliminating the need to...

[m]intty is both a valid regular expression for grep and a valid sh pattern for pathname expansion. If you don't quote that argument, and if the current working directory has a matching item, the...