posix - Using Sys.chmod to toggle world-readability in R -


how can use sys.chmod function in r toggle readability "other", i.e. equivalent of:

chmod o+r myfile chmod o-r myfile

i want leave other parts of mode alone.

chmod o+r:

mod <- file.info('tmp.txt')$mode sys.chmod('tmp.txt', mod|4)

chmod o-r:

mod <- file.info('tmp.txt')$mode sys.chmod('tmp.txt', mod&!as.octmode(4))

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