Login or Register to Ask a Question and Join Our Community


UNIX for Beginners Questions & Answers

Changing CSV files with date . Subtracting date by values

 
Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Changing CSV files with date . Subtracting date by values
Prev   Next
# 1  
Old 11-01-2018
Changing CSV files with date . Subtracting date by values
Hi All,

I have a CSV file which is as below. Basically I need to take the year column in it and find if the year is >= 20152 . If that is then I should subtract all values by 6. In the below example in description I am having number mentioned as YYWW so I need to subtract those by -5. Whereever I find the year I have ti subtract by -5. If the year is >201601 then I have to subtrct by -6. The year representation is 52 week. so if the week falls on 03 for example 201403 then the subtraction of -6 will yield 201347. I am planning to do in C++ ,not sure if this possible with awk or sed.

Code:
Year representation goes like 
201101
201103
..
..
..
201151
201152
201201
201202

Original
Code:
id,description,type,year,obj
994475,1832 +TRANS     1835 10/17/18,S,201835,P
994477,1836 + NOTAPP 1839 10/17/18,S,201839,1
828058,CONTROL 1452-1527,1552-1627,S,201627,OP
828059,1452-1527,1552-1627,S,201627,UU

Modified
Code:
id,description,type,year
994475,1820 +TRANS     1829 10/17/18,S,201829,P         ---------------------  Year is 2018  should be subtracted by 6
994477,1830 + NOTAPP 1833 10/17/18,S,201833 ,1         ---------------------  Year is 2018  should be subtracted by 6
828058,CONTROL 1436-1521,1546-1621,S,201621,OP  ---------------------  Year is 2016  should be subtracted by 6
828059,1447-1522,1547-1602 ,S,201622,UU ---------------------                Year is 2015  should be subtracted by 5

Last edited by RudiC; 11-01-2018 at 04:24 PM..
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Subtracting a date based on ls output

I am trying to achieve to get only the month and the day. Example Feb 5 (as you can see if it is feb 1-9) the space is 2. If it is feb 10-28, the space is only 1. I am trying to right a script that will list a directory and shoot an email if there is an activity in last 7 days. I dont really trust... (5 Replies)
Discussion started by: invinzin21
5 Replies

2. Shell Programming and Scripting

Subtracting months from passed Date

Hi All, I am getting a date from environment variable and want to do some processing by subtracting 2 months from the date passed through the environment variable. I am trying the following syntax : date_var=2014-08-31 date_2M_ago='$date_var+"%d%m%y" --$date_var="2 months ago" '... (3 Replies)
Discussion started by: Rahul Raj
3 Replies

3. Shell Programming and Scripting

Adding/ Subtracting from Date

Hi , How can I add/substruct x number of days with date? For example My_Date=`date` Now I need Hope it's clear. (2 Replies)
Discussion started by: Anupam_Halder
2 Replies

4. Shell Programming and Scripting

Changing date format in CSV file

I have a CSV file with a date format like this; 11/19/2012 17:37:00,1.372,121.6 11/19/2012 17:38:00,0.743,121.6 Want to change the time stamp to seconds after 1970 so I can get the data in rrdtool. For anyone interested, this is data from a TED5000 unit and is Kwatts and volts. Needs to... (3 Replies)
Discussion started by: ottsm
3 Replies

5. Shell Programming and Scripting

SQL one liner for subtracting 1 from date

I got a statement like below to subtract 1 from given date using teradata. I am looking for a one line unix command to perform the same. select 'parse_this_record', (DATE '${FILE_DATE}' - 1) (FORMAT 'YYYY-MM-DD'); Input: 2012-02-21 Expected Output: 2012-02-20 PS: One liner because I am... (2 Replies)
Discussion started by: siteregsam
2 Replies

6. UNIX for Dummies Questions & Answers

mv folders/files without changing modified date?

Hi all, I'm using Red Hat Linux and want to move some folders and files around but not change the modified date. Is this possible? I know cp has a -p flag which seems to do what I want, but this is a large volume of data so copying and deleting would not be feasible. (13 Replies)
Discussion started by: Annorax
13 Replies

7. UNIX for Dummies Questions & Answers

adding or subtracting days in the o/p of date

how can we add or subtract days from the output of date command in unix... like if i want to subtract a day from the result of date command like this.. v_date=`date +%Y%m%d` this wud give me 20080519 now i want to subtract one day from this.. so tht it wud give me 20080518.. how do i do... (1 Reply)
Discussion started by: St.Fartatric
1 Replies

8. UNIX for Dummies Questions & Answers

Changing Creation Date to a Prespecified Date of a File In Unix

Dear Expert, Is there a command to do that in Unix? In such a way that we don't need to actually "write" or modified the content. -- monkfan (4 Replies)
Discussion started by: monkfan
4 Replies

9. Shell Programming and Scripting

Subtracting date / timestamps

I have looked through the forums and found many date / time manipulation tools, but cannot seem to find something that fits my needs for the following. I have a log file with date time stamps like this: Jun 21 17:21:52 Jun 21 17:24:56 Jun 21 17:27:59 Jun 21 17:31:03 Jun 21 17:34:07 Jun... (0 Replies)
Discussion started by: roadcyclist
0 Replies

10. Shell Programming and Scripting

subtracting a days from current date

Hi i am trying to subtract days from current date. For example todays date is 10/03/2006. If i subtract 2 days it should give 8/03/2006. I am also trying to find the access date of a file in dd/mm/yyyy format. Can any one please help in how to do this. Ramesh (1 Reply)
Discussion started by: rameshspal
1 Replies
Login or Register to Ask a Question