r - two layers of quotes around a bash variable -


i've written bash script makes series of r scripts. however, ive run difficulty quoting bash variable echo r script file read r. have

echo "loadings_file <- $loadings ; calls_file <- $file" | cat - template.r > temp && mv temp $scriptname

$loadings , $file files want r read in. when run end in r script no quotes aroudn them r treat string. how make sure they're quoted in r still expanded in bash first? 

echo "loadings_file <- '$loadings' ; calls_file <- '$file'"

if need double quoting:

echo "loadings_file <- \"$loadings\" ; calls_file <- \"$file\""

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