| system {base} | R Documentation |
Invoke a System Command
Description
system invokes the system command specified by command.
Usage
system(command, intern = FALSE, ignore.stderr = FALSE)
Arguments
command |
the system command to be invoked, as a string. |
intern |
a logical, indicates whether to make the output of the command an R object. |
ignore.stderr |
a logical indicating whether error messages (written to ‘stderr’) should be ignored. This probably only affects Unix-like systems and is ignored otherwise. |
Details
If intern is TRUE then popen is used to invoke the
command and the output collected, line by line, into an R
character vector which is returned as the value of
system. If intern
is FALSE then the C function system is used to invoke
the command and the value returned by system is the exit
status of this function. This function provides users with
the ability to invoke system commands on whatever platform they
are using.
unix is a deprecated alternative, available for
backwards compatibility.
See Also
.Platform for platform specific variables.
Examples
# list all files in the current directory using the -F flag
## Not run: system("ls -F")
# t1 contains a vector of strings, each one
# representing a separate line of output from who
t1 <- system("who", TRUE)
system("ls fizzlipuzzli",TRUE,TRUE)# empty since file doesn't exist