Adding an extra date column in UNIX file

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# 1  
Old 09-30-2018
Adding an extra date column in UNIX file

Hi All,

I have a file with only one column of data (without delimiter). For Ex:

cat temp.txt

I want to insert an additional column with current date as value. So, i have used below command but didn't get the result as excepted. Could onyone over here please help me in writing the current script command. Also i need to get rid of "space" after the comma delimiter.

awk -vd=`date +%Y%m%d` -F"," -OFS="," '{$2=d; print $1,$2}' temp.txt
22055, 20180928
21088, 20180928
93840, 20180928
30990, 20180928
50990, 20180928
50950, 20180928

# 2  
Old 09-30-2018
What is wrong with the result ("didn't get the result as expected)?

$ sed "s/$/,$(date '+%Y%m%d')/" file

Add the -i option to sed, if it's supported in your version, to write the changes directly to the file if the result is as expected.
This User Gave Thanks to Scott For This Post:
# 3  
Old 09-30-2018
The result you present is not quite reproducible. -OFS="," causes an error, but when corrected like -vOFS="," , it should yield the desired output without space. You could even simplify your code snippet like
awk -vd=`date +%Y%m%d` -F"," -vOFS="," '{print $1, d}'  file

This User Gave Thanks to RudiC For This Post:
# 4  
Old 10-01-2018
Thanks both of you for your response and showing the error in the command which I return.

1. I clarified with sed command.
2. For the output with AWK command what is the difference between OFS and vOFS (should we need to use when we pass a variable to the awk script)?

Could you please let me know.

Thanks & regards,
Suresh G
# 5  
Old 10-01-2018
-v declares a variable to use inside awk. You could also put that at the end, without -v. e.g.
awk -vd=`date +%Y%m%d` -F"," '{print $1, d}' OFS="," file

# 6  
Old 10-01-2018
For 2.: Your phrasing doesn't target the right question. We're dealing with two things:

a) the -v option to awk, which you correctly deploy for the passing of the d variable. man awk:
-v var=value assigns value to program variable var.

b) the redefinition of the OFS variable. This can be done in many ways, amongst which

  • -vOFS="<chars?>" in front of the script.
  • OFS="<chars?>" trailing the script
  • BEGIN {OFS="<chars?>"...} (or any other place) within the script
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