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Full Discussion: sed command throwing error while deleting a line from a file
Top Forums Shell Programming and Scripting sed command throwing error while deleting a line from a file Post 302902817 by vivek d r on Thursday 22nd of May 2014 11:29:31 AM
Old 05-22-2014
sed command throwing error while deleting a line from a file
Hi all,


I ahve a program which has to delete a line in a file... if i run the sed command through shell prompt it works fine. But if run it using code its throwing error. May i know where i am doing wrong.



the file has 3 lines
Code:
[root@ ~]# cat /root/.ssh/known_hosts
|1|MXOU9X7fgx6AHKiY334LC42jZ1Q=|cWBsRbmCKgYzDotT1TuVS1iyc3s= ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAzwqooVvj4pkERPlaxfCqbhOeuha3bbv3/YLLy6+drGn8W2mV/sS2vrOfHnYfU3xGdWNt6GFoA7PC5dEdU/MWlkMcxq4y7ceBVVojl9Q1qJntHpEvzW6oKNMg+Usx4BiuAOBqpCgcdequBCBzsvFdO7boJXckwanEVLAkI91Nlo/8bafQYCiOcxIx7D15UPFvVEUd+H7PSs8YC7FySymXTOuq45ppQfHV3ztlF9LWUasbTDKdUhmysV0dos49GzhMUkyrbph+NC+J/jWAMXAtHTiIbi9Sy4tVXpcM8Aq+8isDMpBKtIjESsF7Lei4xD9GKQUdz7sp4MgK3EjL0/hJww==
|1|j5o3eNW9A4j5UKZ8xUCQqCVlym4=|paupRZ08Js918aoLZO1mwQRgUYE= ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAt9rMbOvoPnaL0TJdENoYA1ZOrALwXTEbjyi67cxNOYAQzdjbNgm3bUXkAjumhgjGLwSz04PbjXFv+W+bTffh2EDFuQSW6tEiG1ITTsckOymG6My0A5zSLPsaIAGIWgo9F+mw8x6URAY6yBT+ja187CpjhVoUMnJrE5ght+3PZaRJcFdSWlT3izj3++4khpS+Q4cxNogCuEslGxN5uAxBFbQLxkp3qFEJGCAOl1zrU5gcmTLeIO1Q3+fBEX3F1u3y0/+/vcZ55ZOSkHUvxOVUZ0u3RdWId0sAL5yNrexj8jrsgziJnjWrHhNOjtH0Ou33VXOxyBTCvWmtxex2plTgyw==
|1|RcXETg1pFCqRpgvAB9tVWoL0pl8=|uW/xYTXcf+O22U8Xam4dT35C0gE= ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAt9rMbOvoPnaL0TJdENoYA1ZOrALwXTEbjyi67cxNOYAQzdjbNgm3bUXkAjumhgjGLwSz04PbjXFv+W+bTffh2EDFuQSW6tEiG1ITTsckOymG6My0A5zSLPsaIAGIWgo9F+mw8x6URAY6yBT+ja187CpjhVoUMnJrE5ght+3PZaRJcFdSWlT3izj3++4khpS+Q4cxNogCuEslGxN5uAxBFbQLxkp3qFEJGCAOl1zrU5gcmTLeIO1Q3+fBEX3F1u3y0/+/vcZ55ZOSkHUvxOVUZ0u3RdWId0sAL5yNrexj8jrsgziJnjWrHhNOjtH0Ou33VXOxyBTCvWmtxex2plTgyw==
[root@ ~]#

The error thrown is as below...
Code:
here 1 : lineno: 1
'ed: -e expression #1, char 2: unknown command: `
here 2
'ed: -e expression #1, char 2: unknown command: `

below is the part of the code where its going wrong.
Code:
echo "here 1 : lineno: $lineno"
sed -i "${lineno}d" /root/.ssh/known_hosts
echo "here 2"
sed -i ''$lineno'd' '/root/.ssh/known_hosts'


can anyone give me a quick fix for this. any help is deeply appreciated. thanks
 

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LEARN ABOUT LINUX

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

     ssh-keysign -- ssh helper program for host-based authentication

SYNOPSIS

     ssh-keysign

DESCRIPTION

     ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with
     SSH protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the global client configuration file /etc/ssh/ssh_config by setting
     EnableSSHKeysign to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about host-based authen-
     tication.

FILES

     /etc/ssh/ssh_config
	     Controls whether ssh-keysign is enabled.

     /etc/ssh/ssh_host_dsa_key
     /etc/ssh/ssh_host_ecdsa_key
     /etc/ssh/ssh_host_rsa_key
	     These files contain the private parts of the host keys used to generate the digital signature.  They should be owned by root, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if host-
	     based authentication is used.

     /etc/ssh/ssh_host_dsa_key-cert.pub
     /etc/ssh/ssh_host_ecdsa_key-cert.pub
     /etc/ssh/ssh_host_rsa_key-cert.pub
	     If these files exist they are assumed to contain public certificate information corresponding with the private keys above.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								  August 31, 2010							       BSD
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