@bucaran: Oh I see, ... | read var does not store any history. I suppose stdin is not a tty so it skips the history/readline code path.
I don't think that's obvious from help read, will try to impove the doc as a starting point.

@krader1961 That happens to work but not quite intentionally, -m doesn't expect a full path. strace:

open("/home/bpaskinc/.config/fish//dev/null_history.o8WTAF", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.SIk6NR", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.M1Ti13", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.FuFveg", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.JdDIrs", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.69MVEE", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.2u88RQ", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.0vFm52", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.XgoAif", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)
open("/home/bpaskinc/.config/fish//dev/null_history.0hmOvr", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 ENOENT (No such file or directory)

Uh oh!

Allow read to not store history #1504

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Allow `read` to not store history #1504