SSR-1U User’s Manual
Rev -, 27 Dec 2019
© 2019 Slerj, LLC
16
www.slerj.com
4
Interactive Shell
The interactive shell is designed to provide easy access to the SD card file system, device status,
and configuration options. Entering ‘
?’
or ‘
help’
at the command prompt provides
information about using the shell. Each command can be followed by ‘
?
’ to retrieve help
information. Multiple commands can be separated by a semi-colon. All commands are case
sensitive. For example:
The shell supports line editing and keeps a history of recently used commands. The ANSI
escape sequences shown in Table 5 are supported.
Table 5. Shell Line Editing Sequences
Keyboard Key
Alternate
Sequence
1
Function
Up-arrow
^p
Recall the previous command to the command line.
Down-arrow
^n
Recall the next command to the command line. This is
only available when up-arrow has been used to recall a
previous command.
Home
^a
Move the cursor to the start of the command line.
End
^z
Move the cursor to the end of the command line.
Left-arrow
^k
Move the cursor left one character.
Right-arrow
^l
Move the cursor right one character.
Ctrl + Left-arrow
^b
Move the cursor left (backward) one word.
Ctrl + Right-arrow
^f
Move the cursor right (forward) one word.
1
The caret (^) indicates use of the Ctrl key with the letter.
In the description of individual commands below, the following conventions are used:
[ ] indicates optional parameters
{ } identifies a set of choices separated by | (choose one)
< > indicates a variable defined in the help text
>cls ?
Usage: cls
Clears the screen.
Aliases: clear
>date;time
20130327
102840
>