write_SYMBOLS: Write a SYMBOLS file
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Writes a DCF formatted file, SYMBOLS, containing the symbols exported by each package in a directory containg R package source directories.

1	write_SYMBOLS(dir, verbose = FALSE, source.dirs=FALSE)

`dir`	The root of a CRAN-style package repository containing source packages. When `source.dirs` is `TRUE`, `dir` should be a directory containing R package source directories
`verbose`	Logical. When `TRUE`, progress is printed to the standard output.
`source.dirs`	Logical. When `TRUE`, interpret `dir` as a directory containing source package directories. When `FALSE`, the default, `dir` is assumed to be the root of a CRAN-style package repository and the function will operate on the source package tarballs in `dir/src/contrib`.