a function to unload all loaded libraries in r

main.r
unload_all_libs <- function() {
  # get a list of all loaded packages
  loaded_packages <- search()[grepl("package:", search())]
  
  # detach each loaded package
  for (package in loaded_packages) {
    detach(package, unload = TRUE)
  }
}
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main.r
# load some packages for example
library(dplyr)
library(ggplot2)

# check that they're loaded
search()
#>  [1] ".GlobalEnv"           "package:ggplot2"      "package:dplyr"       
#>  [4] "package:stats"        "package:graphics"     "package:grDevices"   
#>  [7] "package:utils"        "package:datasets"     "package:methods"     
#> [10] "Autoloads"            "package:base"

# unload all loaded packages
unload_all_libs()

# check if they're unloaded
search()
#> [1] ".GlobalEnv"      "package:stats"   "package:graphics" "package:grDevices"
#> [5] "package:utils"   "package:datasets" "package:methods"  "Autoloads"       
#> [9] "package:base"
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