$OUTPUT and $INPUT don't work for me in simple tutorial

[Catherine Dalzell]

I am just starting out with Drake and tried the basic tutorial.  My drakefile is:

; we only like lines with lower case i

out.csv <- in.csv 

  grep i $INPUT > $OUTPUT

When i do drake -w mydrakefile, I get an error:

Using drip to start up JVM...

The following steps will be run, in order:

  1: /home/placidia/Documents/DS at CL/usingDrake/out.csv <- /home/placidia/Documents/DS at CL/usingDrake/in.csv [missing output]

Confirm? [y/n] y

Running 1 steps with concurrence of 1...

--- 0. Running (missing output): /home/placidia/Documents/DS at CL/usingDrake/out.csv <- /home/placidia/Documents/DS at CL/usingDrake/in.csv

/home/placidia/Documents/DS at CL/usingDrake/.drake/shell-4b25e0767043bf75754bc8664458b407.bat: line 1: $OUTPUT: ambiguous redirect

Done (0 steps run).

If I do:

out.csv <- in.csv 

  grep i in.csv > out.csv

I get the expected result. I am running Linux Mint v18 with the Bash shell. Drake is version 1.0.3.

I tried even simpler scripts, along the lines of echo $INPUT, but I got the same error. The $INPUT and $OUTPUT variables don't seem to be working as advertized.

[Aaron Crow]

Hi Catherine,

Thanks for trying Drake!

I've not seen that error before. A little googling led me to this...

http://stackoverflow.com/questions/2462385/getting-an-ambiguous-redirect-error

... and so i verified that adding quotes around $OUTPUT still works for me (see below example). Please try that and let us know what happens...

out.csv <- in.csv
  grep i $INPUT > "$OUTPUT"

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[Catherine Dalzell]

Hi Aaron,

Thanks for this! Yes, it worked. You also have to enclose $INPUT in quotes. 

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