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How to run commands on remote server using ssh password less authentication?

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# 1  
Old 01-29-2015
How to run commands on remote server using ssh password less authentication?
Hi,

I need to run a script located in a directory on remote server by using ssh authentication from my local unix server. Can anyone help me in this.

I have tried the below command. It worked for echo command but when i tried to open a file using cat command it is showing "cat: cannot open the <filename>". I have given the required permissions as well.

Code:
ssh <username>@<ipaddress> cd <path>;cat <filename>

thanks in advance.
# 2  
Old 01-29-2015
Quote:
Originally Posted by ssk250
Hi,

I need to run a script located in a directory on remote server by using ssh authentication from my local unix server. Can anyone help me in this.

I have tried the below command. It worked for echo command but when i tried to open a file using cat command it is showing "cat: cannot open the <filename>". I have given the required permissions as well.

Code:
ssh <username>@<ipaddress> cd <path>;cat <filename>

thanks in advance.
Have you tried putting those commands into a script?

ie:

Code:
echo "cd <path>" >file1.ksh
echo "cat <filename>" >> file1.ksh
chmod +x file1.ksh

make sure it's owned by <username>

then try again:

Code:
ssh <username>@<ipaddress> <path_to_file1.ksh>/file1.ksh

??
This User Gave Thanks to Ditto For This Post:
ssk250
# 3  
Old 01-29-2015
Did the cd <path> succeed, and does <filename> exist in that path?
# 4  
Old 01-29-2015
The problem here is that the cat is running locally. Your local shell is seeing the semicolon as a command separator between the ssh command and the cat command. Try quoting the command string to send it to the remote side eg:

Code:
ssh <username>@<ipaddress> "cd <path>;cat <filename>"

or

Code:
ssh <username>@<ipaddress> cd <path>\;cat <filename>

If you have a more complex command e.g. involving awk I'd suggest a here-doc:

Code:
ssh <username>@<ipaddress> <<"EOF"
    cd /var/log/httpd
    awk '/Invalid method/ { print $5} ' error_log
EOF

This User Gave Thanks to Chubler_XL For This Post:
ssk250
# 5  
Old 01-29-2015
Have you tried
ssh user@host cat /path-to-file/file ?
This User Gave Thanks to JustaDude For This Post:
ssk250
# 6  
Old 02-01-2015
When i tried the commands above I am getting the below error

"cannot open <filename>"

Is it that there will be no permission to execute/open files using commands on remote server?
# 7  
Old 02-01-2015
Remote server will have same permissions to the filesystem that the "username" user has.

Why not try running the command from an interactive shell you can then debug/sort out required permissions:

Code:
$ ssh username@ipaddress
Last login: Fri Jan 30 16:19:27 2015 from your-pc.your.domain

ipaddress $ cat /path-to-file/file
This is the file contents

ipaddress $ exit
Connection to ipaddress closed.

$

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