I want to change my working directory to
`C:\Users\zhanglu\Documents\Julia`, which is a windows style path
containing single back slashs `\` . However, the Julia REPL seems doesn't
accept such expression and if I type like
`cd("C:\Users\zhanglu\Documents\Julia")`
I will receive error message like
`Error syntax: invaild escape squence`
I have to *manually* change the single back slashs to double ones ` \\` to
make it work. *Any convinent way?*
One more question . Is there any convient way to change the working
directory to a subfolder within the current one. say,
`C:\Users\zhanglu\Documents\Julia` within `C:\Users\zhanglu\Documents
`without typing the full path?
