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ssh and redirection

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# 1  
Old 10-06-2011
Tools ssh and redirection
hi,

i was using with success the following rsh statement :
Code:
rsh server -l user1 "> /var/spool/mail/user1"

to clear all the mail by remote

now i try to do the same with ssh without success :
Code:
ssh -t newuser@server  "sudo -u user1 '> /var/spool/mail/user1'"

i'm not authorized to access "user1" by ssh so i use the ssh keys created by newuser

i have the following error :
Code:
sudo: > /var/spool/mail/user1: command not found

regards
Christian

Moderator's Comments:
Mod Comment Please use code tags. Having so many posts, you should be familiar with this.
Last edited by zaxxon; 10-06-2011 at 09:54 AM.. Reason: code tags, see PM
# 2  
Old 10-06-2011
Quote:
ssh -t newuser@server "sudo -u user1 '> /var/spool/mail/user1'"
i'm not authorized to access "user1" by ssh so i use the ssh keys created by newuser

i have the following error :

Code:
sudo: > /var/spool/mail/user1: command not found
this looks like a fault with the second part of your command, try removing the single quotes from around your redirection.

i believe this removes the special meaning of the > character so instead of redirecting output it sees that as a command to be run by the user1.
# 3  
Old 10-06-2011
but this is what i want :

connecting by SSH using sudo :

Code:
ssh -t newuser@server "sudo -u user1

then running the ">" to erase the mail file :

Code:
> /var/spool/mail/user1

with the rsh this ">" works but any others commands like : touch or echo "" didn't have the permissions.

regards
Christian
# 4  
Old 10-06-2011
i mean do exactly the same but just remove the single quotes so:
Code:
ssh -t newuser@server  "sudo -u user1 > /var/spool/mail/user1"

# 5  
Old 10-06-2011
In that case it is trying to create the file by redirecting the sudo :!
ksh: cannot create /var/spool/mail/notes03: Permission denied

i want to use the ">" as a command to erase the file because we have the rights to do it.

regards
Christian
# 6  
Old 10-06-2011
then maybe try:

Code:
ssh -t newuser@server  "sudo -u user1 -i > /var/spool/mail/user1"

the -i option opening a new shell for the user reading the .profile and executing the command provided.
# 7  
Old 10-06-2011
Quote:
Originally Posted by Nicol
but this is what i want :

connecting by SSH using sudo :

Code:
ssh -t newuser@server "sudo -u user1

then running the ">" to erase the mail file :

Code:
> /var/spool/mail/user1

with the rsh this ">" works but any others commands like : touch or echo "" didn't have the permissions.

regards
Christian
can you try this
Code:
ssh -t newuser@server  "sudo -u user1 echo -n > /var/spool/mail/user1"
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