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Find location of executable within path or specified directory

Source: R/check_exe.R
check_exe.Rd

The check_exe() function first checks the specified directory dir for the specified SS3 executable name and returns the file's location if found. If it is not found in the specified directory, then it checks the PATH. Linux systems may have an existing executable utility /usr/sbin/ss in the path. If exe = "ss3" and this file is found by check_exe()``, it will be ignored based on the smaller file size relative to the SS3 executable. Linux users who want to use the workflow of having SS3 in their PATH should name the SS3 file something besides ss, such as ss3orss_linux`.

Usage

check_exe(exe = "ss3", dir = getwd(), verbose = FALSE)

Arguments

exe

Executable name. Can be just the name of the executable file if it is in the specified directory or in the user's PATH. Can also include the absolute path or a path relative to the specified directory. Needs to be a single character string, not a vector. On Windows, exe can optionally have the .exe extension appended; on Unix-based systems (i.e., Mac and Linux), no extension should be included.

dir

The directory where exe is located (if not in path). Defaults to getwd() but can be an absolute path, a path relative to the working directory or a path relative to a directory that's in the PATH. Can also be a vector of directories.

verbose

A logical value specifying if output should be printed to the screen.

Value

A list containing $exe and $path. $exe is the cleaned version of the exe file name input. Windows systems will include ".exe" in the returned value. On Linux and Mac systems, the returned $exe will include "./" if the executable was found in the specified directory dir. This will be a single character string, unlike $path which will be a vector if the input dir is a vector. The $path element of the list includes the normalized path (or paths if dir is a vector) where the executable was found. If dir

is a vector and the executable is missing from a subset of those directories, NA is returned for those elements of $path. If the specified exe input is not found in any of the dir input values nor in the PATH, then the function stops with an error.

Details

Check that the Stock Synthesis executable name provided in exe, an input argument to numerous r4ss functions is available in the location specified by dir or in the path.

See also

run()

Author

Kelli F. Johnson, Ian G. Taylor

Examples

if (FALSE) {
# check for executable called "ss3" or "ss3.exe" in the PATH
check_exe()
# check for executable with a different name in the PATH
check_exe(exe = "ss_win")
# check for executable in a specific directory
check_exe(exe = "ss_linux", dir = "~/ss/ss_v3.30.19.01")
}