** Also affects: tcsh (Debian)
Importance: Undecided
Status: New
** Description changed:
tcsh maintains a history list of the most recent $history commands
executed. The history becomes corrupted after a number of commands have
been executed. When this happens, the history list is cut off at a
random position, showing only a subset of the oldest commands in the
history list, discarding the newer commands which were in the history
list, and the history list is no longer updated with any newly executed
commands. There is no clear trigger for when the history gets corrupted.
It can happen after executing only 8 commands or after more than a
- hundred.
+ hundred. It is possibly triggered by using history modifiers e.g. !$:r
+ and !$:t.
The history list used to work fine in old versions of tcsh somewhere
around version 6.10/11/12, but all recent versions of tcsh have the bug.
This bug exists in, for example, 6.17.06-2 (amd64) from Ubuntu 12.04
Precise and all previous versions back at least as far as 10.04 Lucid.
Clearing and resetting the history using the history variable does not
solve the problem. The only solution is to restart tcsh, e.g. exec tcsh.
The history list is essential for proper use of an interactive shell.
Without it, tcsh is almost completely useless as an interactive shell.
This is a really serious bug.
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https://bugs.launchpad.net/bugs/1103237
Title:
tcsh corrupts its command history list after random number of commands
executed
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