Wolfram System Session History

The history of an interactive Wolfram Language computation is both maintained in a fully editable Wolfram Language notebook and stored symbolically in a sequence of In and Out objects that can immediately be used in other Wolfram Language commands.

ReferenceReference

Out (%, %%, %n, ...) output expressions

In unevaluated input expressions

InString original input strings

MessageList messages produced while generating each output

ShowCellLabel  ▪  CellLabelAutoDelete

Ctrl+L copy down an input line (Insert Input from Above)

Ctrl+Shift+L copy down an output line (Insert Output from Above)

InputForm show output, graphics, etc. in input form

$Line resettable current line number

$HistoryLength number of previous outputs to keep

$OutputSizeLimit maximum size of output to give explicitly

Cell Notebook History summarize the editing history of a notebook

Saving Session History Information

Save save definitions for symbols, functions, or contexts

Put, PutAppend save Wolfram Language expressions

NotebookSave  ▪  NotebookAutoSave

File Save