history from one of many parallel shell sessions sometimes not stored

[Thorsten Glaser]

Natureshadow reports that, when having multiple parallel mksh sessions that share the same HISTFILE, after exiting one of them and then starting a new one, the history from the shell just terminated is not available.

We currently believe this is due to history truncation (i.e. number of history lines approaching $HISTSIZE). There are known issues with the code (which is another reason HISTFILE is unset by default, and persistent history support so -><- close to having been removed). A workaround is:

① make HISTSIZE bigger
② truncate manually by setting HISTSIZE small while only one shell is accessing the HISTFILE

Ideally we’d have a PostgreSQL history backend, but that won’t work for obvious reasons. I’m not sure how much we can do with the current ⓐ history file format and ⓑ command line editing code, but improvements are planned for libmkshedit when at least the latter is going to be redesigned anyway and the former can change.

[Thorsten Glaser (mirabilos)]

According to multiplexd this is likely fixed in R56. If not, pleas e open a new issue.