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conditional replacement

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# 1  
Old 11-26-2010
conditional replacement
Hi all,

I need a bash, sed, awk script or one liner to do the following task:

This is the format of a text file:
Code:
2010-06-11 20:01 902656 HOP-W-100412-1.doc
2010-11-05 18:01 364447 NEX-W-101104-1
2010-07-06 10:01 64512 Cerintele
2010-07-06 10:01 599420 content
2010-07-19 14:01 1785344 specifications.ppt
2010-05-03 13:01 542673 Attends
...

I need to delete from this file the lines where the date and time in the first two columns are older then a given date.
I think may be a good solution to replace the date and time with the format of date in seconds since 1970-01-01 00:00:00.
Code:
cut -d" " -f1,2 textfile.txt | date -f - +$s

This command is working, but I don't know how to replace the output in place.

After that may be using some kind of conditional grep...
Code:
grep -v ($1 < $myconstant) textfile.txt

- I know, this command isn't exist, just an example...

Thank you in advance,

vazi
Last edited by vbe; 11-26-2010 at 07:47 AM.. Reason: code tags please
# 2  
Old 11-26-2010
Try:
Code:
awk -F- '$1$2$3>=d' d=20100719 infile

This User Gave Thanks to Scrutinizer For This Post:
gc_sw
# 3  
Old 11-26-2010
I don't know how to use your example, it's not doing anything. It's just echoing the infile...
# 4  
Old 11-26-2010
If I apply this to your file it deletes every line that is older than 20100719
Code:
$ awk -F- '$1$2$3>=d' d=20100719 infile
2010-11-05 18:01 364447 NEX-W-101104-1
2010-07-19 14:01 1785344 specifications.ppt

You can use any date
Code:
$ awk -F- '$1$2$3>=d' d=20101105 infile
2010-11-05 18:01 364447 NEX-W-101104-1

# 5  
Old 11-26-2010
Ah, sorry... I see now.

But I need to put in game the time entry too in the second column.

Thanks,
# 6  
Old 11-26-2010
It seemed to me time does not really matter if your are deleting posts after a certain date.

If you want to delete everything older than a specific point in time you could do this:
Code:
$ awk -F'[-: \t]' '$1$2$3$4$5>=d' d=201007191500 infile
2010-11-05 18:01 364447 NEX-W-101104-1

Code:
$ awk -F'[-: \t]' '$1$2$3$4$5>=d' d=201007191400 infile584
2010-11-05 18:01 364447 NEX-W-101104-1
2010-07-19 14:01 1785344 specifications.ppt

Last edited by Scrutinizer; 11-26-2010 at 09:17 AM..
# 7  
Old 11-26-2010
Seams to work for me.

Thank you wm,
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