Hola,
How can I add a column to a existing file??

PS: The column which should be added need to be the first column and it will be a parameter from the script.
Example:
1 name1
2 name2
3 name3
4 name3

Need to add parameter $file as a first column. $file is a file name with time stamp which will be same for all the rows.

Thanks
Olivia

I'm not sure if that's your input data, or your output data.

We really need to see both to understand what you want.

file=<filename with timestamp>

while read LINE
do 
    echo "$file $LINE" >> temp_file.txt
    
done < input_file 

temp_file.txt > input_file

where input_file is 1 name1 2 name2 3 name3 4 name3 which after code should be <filename with timestamp> 1 name1 <filename with timestamp> 2 name2 <filename with timestamp> 3 name3 <filename with timestamp> 4 name3

Apologize, I was not clear

That's is input
my output should be

$File 1 name1
$File 2 name2
$File 3 name3
$File 4 name4


$File is the file name generated from the script.

---------- Post updated at 04:17 PM ---------- Previous update was at 04:10 PM ----------

Thank you both yeah, thats exactly what I am looking for i appreciate your help.

---------- Post updated at 04:57 PM ---------- Previous update was at 04:17 PM ----------

Yeah it worked but is there any other way as because it's been adding first column to the blank rows too

Show us a representative sample of your input, then, and a representative sample of your output.

for your previous post ..

$ awk '{print "filename"$0}' infile

Hi.
cheers, drl