Concatener many files in one file with R

# With this only command: system("cat admi* > LnPD.txt")

# Here, on your working directory, you have many files which start with "admi" and blabla something. The "*" correspond to "blabla something", for example, "admixture_run_7_f.txt", "admixture_run_9_f.txt", "admixture_run_10_f.txt"... You want just one file which is name is LnPD.txt.