tmux test always fails on centos7

[ratmav]

# Start tmux if present and not already running.
if command -v tmux>/dev/null; then
  [[ ! $TERM =~ screen ]] && [ -z $TMUX ] && exec tmux
fi

The test used to determine if tmux is installed in the Bash profile always fails on CentOS 7, and probably other Linux distributions. This should be an easy fix, but logging here to remember to fix it later. Not a blocking issue at the moment.

[ratmav]

Leaving tmux behind, and moving from vim to Spacemacs.