warnings output on command line with docker helper

[mrjones-plip]

Describe the issue When you run docker helper and opt to create a new project there's some warnings output:

Would you like to initialize a new project [y/N]?y
grep: warning: stray \ before :
grep: warning: stray \ before :

Describe the improvement you'd like These should not be output

Describe alternatives you've considered they're benign, so could leave as is