is_installed {fritools}

Is an External Program Installed?

Description

Is an external program installed?

Usage

is_installed(program)

Arguments

program

Name of the program.

Value

TRUE on success, FALSE otherwise.

See Also

Other logical helpers: get_run_r_tests(), is_batch(), is_cran(), is_false(), is_force(), is_not_false(), is_null_or_true(), is_of_length_zero(), is_r_cmd_check(), is_r_package_installed(), is_running_on_fvafrcu_machines(), is_running_on_gitlab_com(), is_success(), is_version_sufficient(), is_windows()

Other operating system functions: clipboard_path(), file_copy(), file_save(), get_boolean_envvar(), get_run_r_tests(), is_r_package_installed(), is_success(), is_windows(), view(), vim(), wipe_tempdir(), with_dir()

Examples

if (is_running_on_fvafrcu_machines() || is_running_on_gitlab_com()) {
    # NOTE: There are CRAN machines where neither "R" nor "R-devel" is in
    # the path, so we skipt this example on unkown machines.
    is_installed("R")
}
is_installed("probably_not_installed")