'How do I restart R in linux using a line of code?

I need to restart an R session running in linux using a line of code. When the R session restarts I need it to load an existing R script and for the new R session to be clear of previously loaded packages, variables etc.

I've managed to make this work from within an R terminal in Windows using the following code:

library(startup)
restart(args = c('source("existing_code.R")'))

However when the same code runs in a Linux environment I get the following error:

sh: -c: line 0: syntax error near unexpected token `('

sh: -c: line 0: `'/opt/R/3.6.3/lib/R/bin/exec/R' source(" existing_code.R")'

r linux

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'How do I restart R in linux using a line of code?

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