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Issue in using variable within sed command

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# 1  
Old 06-05-2012
Issue in using variable within sed command
Hi All,

I am trying to use a variable within the sed command but I am not able to get the output.

When I am using the following command (without variable) its working fine:
Code:
sed -n '/2011\/12\/10 18:11:11./,$p' < Log.txt > Delta_Log.txt

But when I am putting the value 2011\/12\/10 18:11:11. in variable date_str and then use the variable, there is no output.

Have tried the following syntax's:
Code:
sed -n '/$date_str/,$p' < Log.txt > Delta_Log.txt

Code:
sed -n '/"$date_str"/,$p' < Log.txt > Delta_Log.txt

Last edited by Franklin52; 06-05-2012 at 09:10 AM.. Reason: Please use code tags for data and code samples
# 2  
Old 06-05-2012
Single quotes prevent the shell to expand the variables, try it with double quotes:
Code:
sed -n "/$date_str/,$p" < Log.txt > Delta_Log.txt

# 3  
Old 06-05-2012
Hi Franklin,

Tried it with double quotes but getting the following error message:

Code:
sed: Function /2011\/12\/10 18:11:11./, cannot be parsed

Last edited by Scrutinizer; 06-05-2012 at 09:18 AM.. Reason: code tags
# 4  
Old 06-05-2012
When you are weak-quoting (double-quotes) for expansion/evaluation by the shell, make sure that the $ (last line for sed) is not evaluated by escaping it.

Code:
sed -n "/${date_str}/,\$p" <filename>

# 5  
Old 06-05-2012
Thanks a lot!!!

Now it works
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