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Convert date format and numbers in column on Linux

Posted on 2014-11-19
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Last Modified: 2014-11-26
Hi,
I have file on Linux with 50000+ lines like below:
Wed Nov 19 04:42:33 2014|1969929|877973|439.549|
Wed Nov 19 04:43:05 2014|1291231|969149|138.522|
Wed Nov 19 04:43:05 2014|969151|969149|5.884|

I need to do the following on Linux:
    First column convert to format "%Y%m%d%H%M%S"
    Second and third column divide by 1048576
    Forth column roundup

20141119044233|1.87|0.84|439


Thanks in advance
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Question by:IKeystone
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24 Comments
 
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Expert Comment

by:ozo
ID: 40453809
perl -aF'\W' -ne '$"="";printf "$F[6]${{Jan=>1,Feb=>2,Mar=>3,Apr=>4,May=>5,Jun=>6,Jul=>7,Aug=>8,Sep=>9,Oct=>10,Nov=>11,Dec=>12}}{$F[1]}@F[2..5]|%.2f|%.2f|%.d\n",(map$_/1048576,@F[7,8]),$F[9]' file
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by:tel2
ID: 40456346
Well said, ozo.

IKeystone, when you say "Forth column roundup", what do you mean in the context of your example, which has "439.549" as input and "439" as output?  Looks more like "truncate forth column to 0 decimal places", to me.
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by:tel2
ID: 40456397
Hi again IKeystone,

If you are wanting to round the forth column to the nearest integer, here are some slight modifications of ozo's code which seem to do it:

perl -aF'\W' -ne '$"="";printf "$F[6]${{Jan=>1,Feb=>2,Mar=>3,Apr=>4,May=>5,Jun=>6,Jul=>7,Aug=>8,Sep=>9,Oct=>10,Nov=>11,Dec=>12}}{$F[1]}@F[2..5]|%.2f|%.2f|%f\n",(map$_/1048576,@F[7,8]),$F[9]+$F[10]/1000' file

Here's the output:
20141119044233|1.88|0.84|440
20141119044305|1.23|0.92|139
20141119044305|0.92|0.92|6
If that's not what you want, please claify your requirements.
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by:ozo
ID: 40456405
perl -aF'[^\w.]' -ne '$"="";printf "$F[6]${{Jan=>1,Feb=>2,Mar=>3,Apr=>4,May=>5,Jun=>6,Jul=>7,Aug=>8,Sep=>9,Oct=>10,Nov=>11,Dec=>12}}{$F[1]}@F[2..5]|%.2f|%.2f|%.f\n",(map$_/1048576,@F[7,8]),$F[9]'
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by:tel2
ID: 40456420
Well said again, ozo.

IKeystone, note that my '%f' was meant to read '%.f'.  But my code only works if the forth column has 3 decimal places (e.g. 5.5 would be considered the same as 5.005).  ozo's new solution doesn't have that limitation, though...and it's shorter...as usual.
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Author Comment

by:IKeystone
ID: 40458710
Working fine. Can you change you script to have double digit month. Jan=01, etc ...
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by:tel2
ID: 40458722
Good to hear it, IKeystone.

I expect ozo will give you that fix shortly...if I don't beat him to it.

And would you want double digit days, too?  No extra charge if you do.  Just say the word.

Meanwhile...
What do you mean by "Forth column roundup", IKestone?  For example, do you want "5.499" to round down to "5" or up to "6"?  What about "5.001"?
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Author Comment

by:IKeystone
ID: 40458743
Mean 4.589=5, 5.3467=5, 5.001=5, 116.5=117 (I think). Roundup to nearest integer
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by:tel2
ID: 40458747
Or more simply, "round to nearest integer", I guess.
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by:tel2
ID: 40458760
What was the answer to the question in my last post about "double digit days", IKeystone?

Why is it that I have to ask everything more than once?  I'm trying to prevent you from running into problems and having to come back and ask again.  Please make it easy for us to help you, especially when we are trying to go the extra mile for you.
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Accepted Solution

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tel2 earned 250 total points
ID: 40458769
While I'm waiting for a response to my last post, try this:

perl -aF'[^\w.]' -ne '$"="";printf "%d%02d%02d%02d%02d%02d|%.2f|%.2f|%.f\n",$F[6], ${{Jan=>1,Feb=>2,Mar=>3,Apr=>4,May=>5,Jun=>6,Jul=>7,Aug=>8,Sep=>9,Oct=>10,Nov=>11,Dec=>12}}{$F[1]},@F[2..5],(map$_/1048576,@F[7,8]),$F[9]' file
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by:ozo
ID: 40459074
perl -aF'[^\w.]' -ne '$"="";printf "$F[6]${{Jan=>"01",Feb=>"02",Mar=>"03",Apr=>"04",May=>"05",Jun=>"06",Jul=>"07",Aug=>"08",Sep=>"09",Oct=>10,Nov=>11,Dec=>12}}{$F[1]}@F[2..5]|%.2f|%.2f|%.f\n",(map$_/1048576,@F[7,8]),$F[9]' file
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Expert Comment

by:simon3270
ID: 40459992
Alternatively, just using standard commands ("date" to convert the date, "bc" to handle the division, and printf to do the rounding (bc just truncates)):
OIFS=$IFS
IFS='|'
while read dat; do
  set $dat
  d1=$(date -d "$1" '+%Y%m%d%H%M%S')
  d2=$(echo "scale=5;$2/1048576.0" | bc)
  d3=$(echo "scale=5;$3/1048576.0" | bc)
  printf "%s|%0.2f|%0.2f|%0.0f\n" "$d1" "$d2" "$d3" "$4"
done < file
IFS=$OIFS

Open in new window

(Note that printf rounds down when the fraction is exactly 0.5)
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by:tel2
ID: 40460919
Works for me, Simon.

> "(Note that printf rounds down when the fraction is exactly 0.5)"
Good point.  I never knew this.  Strange!  0.5 rounds down, and 1.5 etc rounds up!
$ printf "%1.0f\n" 0.5
0
$ printf "%1.0f\n" 1.5
2

What's that about?

Same thing happens via printf in Perl, so I maybe it uses the same code.

tel2
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Expert Comment

by:ozo
ID: 40460955
The standard when rounding in a base that is a multiple of 2 but not a multiple of 4 (such as base 10 or base 2) is to round values that are half way between an even number and an odd number to the even number.
(see Knuth, Graham, et al.)
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Expert Comment

by:tel2
ID: 40460963
Thanks ozo.  And that's what seems to be happening below.

$ printf "%1.0f\n" 2.5
2
$ printf "%1.0f\n" 3.5
4
$ printf "%1.0f\n" 4.5
4
$ printf "%1.0f\n" 5.5
6
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Author Comment

by:IKeystone
ID: 40462713
Latest changes from ozo doesn't work.

syntax error at -e line 1, at EOF
Missing right curly or square bracket at -e line 1, within string
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Expert Comment

by:tel2
ID: 40463120
Have you tried my amendments to ozo's code, IKeystone?  See post 40458769, above.  What is wrong with that code?

And I know I've already asked this twice, but I in the absense of an ansewer, could you please answer my question in post 40458760.

Thanks.
tel2
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Author Comment

by:IKeystone
ID: 40463277
Sorry for misunderstanding. 40458769 working fine. And yes, I need double digit days and month
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Expert Comment

by:tel2
ID: 40463346
Thanks for the clarification, IKeystone.  My version of ozo's code handles double digit months and days.

Does that cover your requirements, or have we missed anything?
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Assisted Solution

by:ozo
ozo earned 250 total points
ID: 40464017
perl -aF'[^\w.]' -ne 'BEGIN{$"="";@m{qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)}="01".."12"} printf "$F[6]$m{$F[1]}@F[2..5]|%.2f|%.2f|%.f\n",(map$_/1048576,@F[7,8]),$F[9]' file
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Expert Comment

by:tel2
ID: 40467847
Thanks for the points, IKeystone.  Generous (to me) considering that ozo provided the basic code, but I guess some of my points are for nagging you to give us full spec's, which is all part of the work.  8)
Personally I think simon deserved some credit for providing a perfectly working solution too, although I expect the Perl solutions would be much faster (if speed is a consideration).

ozo, that's very concise/elegant, as usual.  Did you notice that it doesn't always output 2 digits for days though?  That is part of the final spec's.  For example, this input:
    Wed Jan 2 04:43:05 2014|969151|969149|5.4|
gives results in this output:
    2014012044305|0.92|0.92|5
but should result in this output:
    20140102044305|0.92|0.92|5

tel2
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by:simon3270
ID: 40467863
@tel2 - Maybe that's an argument for using the shell-based version. The  formatting is a little more visible, though I do think that  the Perl version is more concise! :-)
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by:tel2
ID: 40467878
True, Simon.  Concise, but cryptic.  Though it could be written more readably, starting by not writing it as a one-liner.
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