CODEWITHSUNDEEP
elixir
softshipper
softshipper

Reputation: 34071

Double quotes in string

I have following shell statement:

gs -q -dNODISPLAY -c "(/Users/developer/Desktop/1449367569_Concurrency.pdf) (r) file runpdfbegin pdfpagecount = quit"

and want to execute in elixir with the system.cmd function. I tried as follow:

System.cmd("gs", ["-q", "-dNODISPLAY", "-c \"(/Users/developer/Desktop/1449367569_Concurrency.pdf) (r) file runpdfbegin pdfpagecount = quit\""])

But it does not work at all. The output is just nothing.

Upvotes: 0

Views: 416

Answers (1)

Dogbert
Dogbert

Reputation: 222108

In the original command you posted, the shell will pass 4 arguments to gs:

-q
-dNODISPLAY
-c
(/Users/developer/Desktop/1449367569_Concurrency.pdf) (r) file runpdfbegin pdfpagecount = quit

The double quote around (/Users/developer/Desktop/1449367569_Concurrency.pdf) (r) file runpdfbegin pdfpagecount = quit is not passed to gs; it's just part of the shell's syntax, useful for when you want to include a space character in an argument. For example echo "foo" will print just foo, not "foo".

So you need to split -c and the rest into separate strings, and not include the double quote in the last argument:

System.cmd("gs", ["-q", "-dNODISPLAY", "-c", "(/Users/developer/Desktop/1449367569_Concurrency.pdf) (r) file runpdfbegin pdfpagecount = quit"])

Upvotes: 1

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