Adding an extra date column in UNIX file


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# 1  
Adding an extra date column in UNIX file

Hi All,

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

Code:
cat temp.txt
22055
21088
93840
30990
50990
50950

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.

Code:
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  
What is wrong with the result ("didn't get the result as expected)?

Code:
$ sed "s/$/,$(date '+%Y%m%d')/" file
22055,20180930
21088,20180930
93840,20180930
30990,20180930
50990,20180930
50950,20180930

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  
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
Code:
awk -vd=`date +%Y%m%d` -F"," -vOFS="," '{print $1, d}'  file
22055,20180930
21088,20180930
93840,20180930
30990,20180930
50990,20180930
50950,20180930

This User Gave Thanks to RudiC For This Post:
# 4  
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  
-v declares a variable to use inside awk. You could also put that at the end, without -v. e.g.
Code:
awk -vd=`date +%Y%m%d` -F"," '{print $1, d}' OFS="," file

# 6  
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:
Quote:
-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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