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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 DEBIAN

platform::shell

platform::shell(3tcl)					       Tcl Bundled Packages					     platform::shell(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4						     platform::shell(3tcl)
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