For the desktop versions (macOS, Linux, Windows/DOS, Windows/CYGWIN, Windows/WSL), you can start the program with the "-terminal" argument and then have an insh prompt:
Linux> <install_path>/EsbRootView/<version>/bin/EsbRootView -terminal (macOS> <install_path>/EsbRootView/<version>/EsbRootView.app/Contents/MacOS/EsbRootView -terminal) ( DOS> <install_path>\EsbRootView\<version>\bin\EsbRootView.exe -terminal) EsbRootView_insh$
You can already change the prompt by proceeding as for a Bourne shell by defining the PS1 variable in your .insh:
PS1='EsbRootView> '
and after restarting you should have:
EsbRootView>
The terminal prompt handles an history file. The logic is the same as for a bash prompt:
EsbRootView$ history .... 469 scene_set_clear_color ROOT/kMagenta+3 470 scene_clear_dynamic 471 FgdHit_vis -modeling=cube -color='ROOT/kMagenta+3' 472 exit 473 history EsbRootView$ !470 EsbRootView$ !471 EsbRootView$ !!
By typing twice the tab key, you activate the completion and have the list of available commands.
On good part of commands, you have a help text that you can read by using the help command:
EsbRootView_insh$ help echo EsbRootView_insh$ help event_model
See the "help text of commands" section for a raw dump of the commands help texts.