Passing SED variable 2

[SteveR77]

This is one of those things that always seems to bite me.

I have the following in my script -
sed -i '284s/"[^"]*"/"mclane.com mclane.mclaneco.com"/g' <filename>

I need to configure the command so the 284 line number can be read as $ln in case the file
gets modified and the line number that actually needs to be edited changes.

I thought the following would work but that is not the case.

sed -i "$ln s/"[^"]*"/"mclane.com mclane.mclaneco.com"/g" <filename>


Thank you for your insight and assistance.

SteveR77

I.T. where a world of choas and confusion comes down to nothing but 1s and 0s.

 

[feherke]

Hi

That would be correct for Sed, however the shell will probably yell at you because of unterminated string :
[pre]sed -i [highlight #8AE234]"$ln s/"[/highlight][^[highlight #8AE234]"]*"[/highlight]/[highlight #8AE234]"mclane.com mclane.mclaneco.com"[/highlight]/g[highlight #8AE234]" <filename>[/highlight] [highlight #8AE234] [/highlight] [highlight #8AE234] [/highlight] [highlight #8AE234] [/highlight][/pre]

You can either :

[gray]# escape internal double quotes[/gray]
sed -i "$ln s/\"[^\"]*\"/\"mclane.com mclane.mclaneco.com\"/g" <filename>

[gray]# double quote ( or not quote ) only the variable[/gray]
sed -i "$ln"' s/"[^"]*"/"mclane.com mclane.mclaneco.com"/g' <filename>
sed -i $ln' s/"[^"]*"/"mclane.com mclane.mclaneco.com"/g' <filename>

Feherke.
feherke.ga

 

[SteveR77]

Feherke,

Thank you. The single, double quoting, triple single quotes is always fun to attempt to keep straight.

I went with double quoting the variable and then using the single quotes which are more sed "standard" for syntax.

Thank you once again.

SteveR77

I.T. where a world of choas and confusion comes down to nothing but 1s and 0s.