Nothing
# A. packages avaiable
options(width = 73); p1 <- available.packages(); str(p1)
p1[c("apt", "erer", "xlsx"), c(1, 2, 4)]
# B. packages installed on a computer
p2 <- installed.packages(); str(p2)
p2[c("apt", "erer", "xlsx"), c(1, 3, 5)]
# C. Packages loaded and attached
# C1. At the beginning of an R session
sa <- sessionInfo(); sa
listn # error: object 'listn' not found
# C2. Loading "apt" library only
loadNamespace(package = "apt")
sb <- sessionInfo(); sb
listn # error: object 'listn' not found
erer::listn # work well
# C3. Attaching "apt" library
library(apt)
sc <- sessionInfo(); sc
listn # work well
erer::listn # work well
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