Tenex Shell

As mentioned, the T shell is a public domain shell. It contains all features of the C shell, as well as a few extra ones. Its default prompt is the greater-than-sign ($>$).

It is invoked using tcsh.

The main reason many users are using the T shell is that it allows the user to recall commands and edit them interactively on the command line, which is not very easily done in the C shell. This is done, as on VAXes, using the up and down cursor keys. It can also be done using EMACS control sequences such as

CTL-P, which recalls the last command executed. Another CTL-P would recall the command previous to that...
CTL-N, which recalls the next command in the history list.
CTL-F moves the cursor one position to the right.
CTL-B moves the cursor one position to the left.
CTL-E moves the cursor to the end of the line.
CTL-A moves the cursor to the beginning of the line.
CTL-H erases the character directly to the left of the cursor.
CTL-D erases the character directly above the cursor.
TAB (the escape key twice) is a command and filename completion (allows the system to provide the rest of the command or filename text if the first characters typed before $<TAB>$ are unique to that command/file name).

Other extra features include an auto-logout facility. The man page of the local installation will describe the facilities of the T shell (if present).