File system navigation
The Series 3700A can use commands from the Lua fs library to navigate and list files that are
available on a flash drive. These Lua commands are in the fs command group in the instrument.
The fs commands make the file system of any given node available to the entire TSP-Link
®
system.
For example, you can use the command node[5].fs.readdir(".") to read the contents of the
current working directory on node 5.
The root folder of the USB flash drive has the absolute path:
"/usb1/"
You can use either the slash (/) or backslash (\) as a directory separator. However, the backslash is
also used as an escape character, so if you use it as a directory separator, you will generally need to
use a double backslash (\\) when you are creating scripts or sending commands to the instrument.
The instrument supports the following Lua fs commands:
fs.chdir() (on page 11-248)
fs.cwd() (on page 11-249)
fs.is_dir() (on page 11-249)
fs.is_file() (on page 11-249)
fs.mkdir() (on page 11-250)
fs.readdir() (on page 11-250)
fs.rmdir() (on page 11-251)
The following Lua fs commands are not supported at this time:
fs.chmod()
fs.chown()
fs.stat()
Script examples
The following script will open three different files to help illustrate the differences between the io
commands and file descriptor commands. After opening the files, the script designates each one as
the default output file (using the io.output command). While each file is the default for file writes
(using the io.write command), the script also uses the file descriptor from the io.open to write to
the file (file:write command).
After all files are closed (using the io.close command), the script will open the files again for
reading. Two files are read by:
• Designating the file the default input file (using the io.input command)
• Being the default read contents of file (using the io.read command)
The third file is read by using the file descriptor from the open (file:read command). After reading
all files, they are closed using the file descriptor and close option (file:close command).
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