[Bug 149] New: shell history file is overwritten after every command

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=149

           Summary: shell history file is overwritten after every command
           Product: Busybox
           Version: unspecified
          Platform: PC
               URL: https://bugs.maemo.org/show_bug.cgi?id=4174
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: a9016009 at gmx.de
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Forwarding from https://bugs.maemo.org/show_bug.cgi?id=4174 .

VERSION: 1.10.2

STEPS TO REPRODUCE THE PROBLEM:
1. Establish a shell session (osso-xterm or ssh, user or root, doesn't matter).
2. Run "ls -l .ash_history" repeatedly.

EXPECTED OUTCOME:
History file is only updated when shell exits.

ACTUAL OUTCOME:
History file is re-written after every command entered
(libbb/linedit.c:remember_in_history).  This is causing unnecessary wear on the
flash and wastes a bit of power.  There are also side-effects with the way
loading the history is handled (will post another bug shortly).

REPRODUCIBILITY:
Always.

OTHER COMMENTS:
There's no way to disable history saving as in most shells by setting an
environment variable, and unsetting HISTFILE doesn't change anything.

The logic of when to save/load still seems the same currently in both trunk
(r23938) and the busybox_1_13_stable branch (r24175).


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