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Re: bash problem


From: Chet Ramey
Subject: Re: bash problem
Date: Fri, 3 Jan 2020 08:34:14 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.3.1

On 1/2/20 8:45 AM, Wheatley, Martin R wrote:
> It appears that there may be an issue when bash terminates a shell as a 
> result of TMOUT expiring.
> 
> I was attempting to enter "dc_command show media | grep YD" to the shell and 
> this is the terminal output...
> 
> OLDuser@hostname $ dc_command show mediatimed out waiting for input: 
> auto-logout
> NEWuser@hostname $  | grep YD
> -bash: syntax error near unexpected token `|'

I don't know what you have TMOUT set to, but it seems kind of small from
that example.


> If the command line had been something like " cd fred && rm -rf *"
> and the TMOUT had expired just after the '&&' had been entered then the 
> "rm-rf *" would have been executed in the `cwd` of the parent process rather 
> than in 'fred'

Yes. Since a child and its parent process share file descriptors (and file
pointers), terminal input not consumed by the child is available for the
parent.

> 
> It looks like the TMOUT isn't re-started after any shell input but only after 
> a '\n' is seen.

That's how it's documented: TMOUT is the number of seconds to wait for "a
line of input after issuing the primary prompt." It issues the prompt and
waits for a complete line of input. That way it can work whether or not
you're using readline.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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