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Nov 20, 2009, 2:33 AM
Post #1 of 1
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[Bug 1673] New: pseudoterminal option (-t) breaks standard out/error separation
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https://bugzilla.mindrot.org/show_bug.cgi?id=1673
Summary: pseudoterminal option (-t) breaks standard out/error
separation
Product: Portable OpenSSH
Version: 5.1p1
Platform: Other
OS/Version: Other
Status: NEW
Severity: normal
Priority: P2
Component: ssh
AssignedTo: unassigned-bugs [at] mindrot
ReportedBy: raker1000 [at] yahoo
When connecting to run commands, standard error ends up mixed with
standard output when using the (-t) pseudoterminal option.
====================
Here's an example without pseudoterminal option where it is working
correctly, and the error messages from the server are captured by fd2
on the client:
---
$ ssh user [at] serve 'uptime ; ls -l /blah' > out 2> err
user [at] serve's password:
$ cat err
ls: cannot access /blah: No such file or directory
$ cat out
05:07:09 up 14 days, 1:40, 4 users, load average: 0.01, 0.02, 0.00
====================
And here's an example with pseudoterminal option where standard error
is mixed in with standard output, and the error messages from the
server are captured by fd1 on the client. The only error message that
went to fd2 was the error from the ssh client executable:
---
$ ssh -t user [at] serve 'uptime ; ls -l /blah' > out 2> err
user [at] serve's password:
$ cat err
Connection to elena closed.
$ cat out
05:07:20 up 14 days, 1:40, 5 users, load average: 0.01, 0.02, 0.00
ls: cannot access /blah: No such file or directory
====================
I tested this from solaris8 to solaris8, from solaris8 to redhat linux,
and from ubuntu linux to ubuntu linux, several versions of
client/server.
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