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ssh, bash, and /dev/stderr: no such device

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# 1  
Old 06-10-2010
ssh, bash, and /dev/stderr: no such device
Hello,

When I run the following program:

Code:
ssh 192.168.1.4 bash -l <<EOF
> echo foo >/dev/stderr
> EOF

I get the following confusing error.

bash: line 1: /dev/stderr: No such device or address

Does anyone know why and how to fix it? I'm capturing stdout in a variable, but I still want to submit some info to the screen if possible. stdout seemed like it might fit the bill . . .
# 2  
Old 06-10-2010
ssh blocks input devices which are not terminals - openSSH 2.0 does this on my system:
Code:
> ssh 1.1.1.1 <<EOF
more>echo 'foo' > 2
more>EOF
Pseudo-terminal will not be allocated because stdin is not a terminal.

Generally, you have two choices:
1. sftp a shell script over to the remote; then ssh hostname shellscript.sh
2. ssh hostname [command line goes here ]
# 3  
Old 06-10-2010
Quote:
Originally Posted by brsett
I get the following confusing error.

bash: line 1: /dev/stderr: No such device or address

Does anyone know why and how to fix it?
It means what it says: no such file.
Code:
$ ls -l /dev/stderr
lrwxrwxrwx 1 root root 4 Jun  9 10:10 /dev/stderr -> fd/2
$ ls -l /dev/fd
lrwxrwxrwx 1 root root 13 Jun  9 10:10 /dev/fd -> /proc/self/fd
$ ls -l /proc/self/fd/2
lrwx------ 1 tyler users 64 Jun 10 15:30 /proc/self/fd/2 -> /dev/pts/0
$

It's a real file, and a symlink at that, ultimately pointing to /proc/self/fd/2. If /proc/self/fd/2 doesn't exist i.e. isn't open, naturally it can't print to it. This happens because you're feeding it a script on stdin, so it figures it doesn't have to bother giving you a full set of stdin/stdout/stderr etc. Try ssh -t, it may give you a normal stderr.
Last edited by Corona688; 06-10-2010 at 06:39 PM..
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