Shell Programming and Scripting

Hi All,

In continuation of my previous thread 'Add text at the end of line conditionally', I need to further modfiy the file after adding text at the end of the line. Now, I need to add a fixed charater string at alternate lines starting from first line using awk or sed.My file is now as below:

Code:

cat myfile

aaaa.txt
bbbb.txt
cccc.txt

VAR="This is a new file"
I have the string stored in the variable VAR and I need the output as below:

Code:

cat myfile

This is a new file
aaaa.txt
This is a new file
bbbb.txt
This is a new file
cccc.txt

Regards
Angshuman

Try:

Code:

sed "s/^/$VAR\n/" file

Hi Scrutinizer,

It is inserting the value but not adding a new line. Actually, I tried this earlier also but it did not work. Here is what I did:

Code:

sed "s/^/$VAR\n/" myfile >tempfile.txt
mv tempfile.txt myfile

cat myfile

This is a new filenaaaa.txt
This is a new filenbbbb.txt
This is a new filencccc.txt

Regards
Angshuman

Code:

awk -vvar=$VAR '{print var;print $0}' file

@angshuman. Are you on Solaris? Use /usr/xpg4/bin/sed instead of sed.

Hi Scrutinizer,
I am on HP Unix
Regards
Angshuman

You probably need to use an actual linefeed character:

Code:

sed "s/^/$VAR^M/" myfile >tempfile.txt

^M is entered as CTRL-V <ENTER>