> On Oct 08, 2017, at 7:27 AM, Mark Volkmann <r.mark.volkm...@gmail.com> wrote: > > >> On Oct 7, 2017, at 9:07 PM, Greg Reagle <greg.rea...@umbc.edu> wrote: >> >>> On Sat, Oct 7, 2017, at 20:18, Mark Volkmann wrote: >>> Here's another way to test this. >>> - open two fish sessions >>> - in the first, enter "echo one" >>> - in the second, enter "echo two" >>> - in the first, enter "echo three" >>> - in the second, enter "echo four" >>> >>> Enter "tail ~/.local/share/fish/fish_history" in both. Of course they >>> will >>> be identical (same file) and will contain all four echo commands. >>> But command recall in either session only recalls the echo commands >>> entered >>> in that session. >>> I don't think there is enough information in the fish_history file to >>> support doing that, so something else must be at play. >>> Another interesting thing is that if you enter "history -n 5" in both, >>> you >>> will only see the echo commands entered in the session where that command >>> is run. >>> So I'm still wondering how fish is able to keep the commands from each >>> session separate. >> >> Okay, I see your point and I think I understand what you are asking. I >> know nothing about the internals of fish since I am just a user, but I >> conclude that a fish session uses *all* of the history file *before* the >> start of the session, and only its *own* history *after* the start of >> the session. Whether it does that via RAM or selective use of the >> history file I don't know. > > Can someone in the know explain how fish is able to do this? >
It’s in src/history.cpp. fish keeps the history in a memory buffer until the buffer is full, then saves it to the history file. If you use multiple sessions often, and want the history from the other sessions, you can use the history builtin to merge in the history with "history merge" ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Fish-users mailing list Fish-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/fish-users
