Hp 50g, SDLIB, SDFiler and moving HPDIR on the SD

[Joe Horn]

(09-04-2017 07:43 PM)pier4r Wrote:  For example I employ shortcuts that I read in a post in this General forum (surely they were known before, but the earliest record in my mind is a forum post in this new forum): "right shift + var_name on the soft menu" to recall the content of a variable, modify those, "left shift + var_name on the soft menu" to store the modified content back in the variable.

Of course, since there is little input check, I may, by mistake, save the content of a variable in another.

Just in case you didn't know, there is also a keyboard trick for that situation too. Every time you press left shift + var_name to overwrite a variable with new contents, its PREVIOUS contents get automatically moved into LASTARG, along with its name. This makes recovery from accidental storing easy: just hit LASTARG (which is left shift + Enter). If you then hit STO, LASTARG, DROP, you'll be right back where you were before the accidental overwrite. Full recovery without using a backup!

Warning: LASTARG is very volatile. Almost every operation changes it. So the above recovery trick only works if performed IMMEDIATELY after the accidental overwrite, before you do anything that changes the contents of LASTARG.

The same feature is built into the STO key. Whenever you use the STO key, that variable's PREVIOUS contents automatically get moved into LASTARG for easy recovery in case of an accidental overwrite.

A similar recovery trick is built into the TOOL / PURGE softkey: it moves the specified variable and its name into LASTARG before deleting the variable, for easy recovery in case of an accidental PURGE.

Please note that these recovery tricks are built into the keyboard operations only, not the corresponding programmable commands STO and PURGE.