[SOLVED] Capture ID of At Command in R

Capture ID of At Command in R

Problem: I want to capture the id of the at command job

This is the normal code to execute the at command

> system(command="echo touch my_path/test_file.in | at 05:26 AM")

And this is the output

job 984 at 2015-12-11 05:26

Since I want to capture that id of the at command so I added the "intern" parameter of the system() function and save the id to a variable

> id<-system(command="echo touch my_path/test_file.in | at 05:26 AM", intern=TRUE)

Still the output was not captured so I tried the system2() function

> id<-system2(command="echo touch my_path/test_file.in | at 05:26 AM", stdout=TRUE, stderr=TRUE)

Still not working. Can someone help me with this?

Solution

system2() quotes the command so you probably want to use something like

id <- system2(
      "sh",
      c("-c","echo touch my_path/test_file.in | at 05:26 AM"),
      stdout=TRUE, stderr=TRUE
     )

Alternatively, you can stick to system() and re-direct stderr:

id <- system("echo touch my_path/test_file.in | at 05:16 AM 2>&1", int=T)