Minicom Advanced Systems CMG-DCM manual Command line tools

Operator's guide

Whilst the DCM is copying the contents of the Flash memory to disk, you will be shown a log of its progress. The USB interface can transfer data at a speed around 100 Kb/s, so large files may take several minutes to complete.

Once a file has been moved from the Flash memory to disk, any further data received which would otherwise be appended to that file will instead be placed in a new file in the Flash memory. Because of this, a stream may occasionally be fragmented. The automatic options are chosen to minimize this likelihood by only moving the oldest files, and by keeping files in Flash memory for a reasonable period of time. If you choose to transfer files to disk more often than this, more files will be fragmented.

gfat32 ls : List the files present on the hard disk, with the size of each file.

gfat32 cpf filename-on-diskdestination-filename : Copy a file from the disk into temporary storage in the Linux filesystem (e.g. in your home directory.) Once the file is in the Linux file system, you can modify or convert it using your own scripts running on the DCM, or use programs such as scp to transfer it to a remote machine.

gfat32 cpt source-filenamefilename-on-disk : Copy a file from the Linux file system onto the disk.

gfat32 mv filename new-filename : Rename a file on the disk.

6.2 Command line tools

The DCM module's Linux operating system can be accessed over a network via SSH. There are many programs available for your computer which implement this protocol: ssh is included as part of most Linux and Unix distributions, whilst for Windows putty is a reliable free client. ssh is essentially a secure version of programs like rlogin and telnet, and provides a simple command line interface to the device. Access to the DCM by SSH is enabled by default, although you can disable it using the net.remoteaccess.ssh configuration option (see “Remote access” in Section 4.4).

In addition, if you have so configured it, you can connect directly to an RS232 port running the getty service.

Once the connection has been set up and you have logged in, you will then be shown a command prompt:

~ #

By default, your account uses the standard Bourne shell, sh. If you prefer, the more advanced shells ash and bash are also available. Many standard Unix programs are also present: ls, cat, more, sed, etc.

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