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  For other interfaces to the underlying serialization format, see
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  For other interfaces to the underlying serialization format, see
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  \code{\link{unserialize}} and \code{\link{readRDS}}.
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  \code{\link{unserialize}} and \code{\link{readRDS}}.
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}
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}
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\examples{
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\examples{
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## save all data
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\dontshow{oldwd <- setwd(tempdir())}
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\dontshow{oldwd <- setwd(tempdir())}
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## save all data
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xx <- pi # to ensure there is some data
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xx <- pi # to ensure there is some data
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save(list = ls(all = TRUE), file= "all.rda")
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save(list = ls(all = TRUE), file= "all.rda")
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rm(xx)
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rm(xx)
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## restore the saved values to the current environment
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## restore the saved values to the current environment
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rm(xx)
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rm(xx)
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attach("all.rda") # safer and will warn about masked objects w/ same name in .GlobalEnv
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attach("all.rda") # safer and will warn about masked objects w/ same name in .GlobalEnv
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ls(pos = 2)
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ls(pos = 2)
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##  also typically need to cleanup the search path:
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##  also typically need to cleanup the search path:
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detach("file:all.rda")
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detach("file:all.rda")
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## clean up (the example):
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unlink("all.rda")
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unlink("all.rda")
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\dontshow{setwd(oldwd)}
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\dontshow{setwd(oldwd)}
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\dontrun{
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\dontrun{
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con <- url("http://some.where.net/R/data/example.rda")
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con <- url("http://some.where.net/R/data/example.rda")
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## print the value to see what objects were created.
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## print the value to see what objects were created.
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print(load(con))
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print(load(con))
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close(con) # url() always opens the connection
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close(con) # url() always opens the connection