Shell Programming and Scripting

I know that I want to entirely replace line 3 in my file filename.txt. I have tried all sorts of variations of

sed 3,3,c\replacement stuff\ filename.txt with no success.

about the only thing that causes any reaction is

sed 3,3c\\ filename.txt
but it just prints out the whole file.

Your help would be much appreciated. I would like to run this from the command line and to run from within a shell script.

The text I actually want to put in line 3 is .run login.txt; just in case there are any peculiarities with dealing with any of those characters.

Many Thanks,

Susan

Did you try

sed 3c"replacement txt" filename.txt

I have now - the response was
sed: 0602-404 Function 3creplacement txt cannot be parsed.

I put your script

>sed 3c"replacement txt" filename.txt

directly into the command line

Is there another alternative?

Regards,

Susan

Try

Code:

sed '3c "replacement txt"' filename.txt

I get
sed: 0602-404 Function 3c "replacement txt" cannot be parsed.

for sed '3c "replacement txt"' filename.txt

Regards,

Susan

How about

Code:

sed '3c\
replacement txt' filename.txt

Note that you have to enter a newline after the backslash.

That's great - it works a treat. Thank you very much.

All the best,

Susan