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Emulate group-by in shell script


 
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# 1  
Old 03-22-2017
Emulate group-by in shell script

Hello All,

I saw this problem on one of the forum and solved it using group-by in oracle sql, though I am a bit curious to implement it using shell script :

There is a file having number of operations :
Code:
Opeation,Time-Taken
operation1,83621
operation2,72321
operation3,13288
operation2,12312
operation1,12321
operation2,45455
operation2,42543
operation1,87934
operation4,94865
operation5,27383
operation6,322
operation6,93483
operation7,3223

My task is to find the min and max time taken by each operation. Expected output :
Code:
operation1,12321,87934
operation2,12312,72321
operation3,13288,13288
operation4,94865,94865
operation5,27383,27383
operation6,322,93483
operation7,3223,3223

I have tried solving it using combination of sort and uniq but not successful :
Code:
sort -nk 2 | uniq

Any help is highly appreciated.
# 2  
Old 03-22-2017
Hi, try:
Code:
awk '
  NR==1 {
    next
  }

  !($1 in L) {
    L[$1]=$2
  }

  $2<L[$1] {
    L[$1]=$2
  } 

  $2>=H[$1] {
    H[$1]=$2
  }

  END {
    for(i in L) print i, L[i], H[i]
  }
' FS=, OFS=,  file


Last edited by Scrutinizer; 03-24-2017 at 03:14 AM.. Reason: Added header skip
This User Gave Thanks to Scrutinizer For This Post:
# 3  
Old 03-22-2017
awk -F, -f muk.awk myFile OFS=, where muk.awk is:
Code:
FNR>1 {
   if (!($1 in amin))
       amin[$1]=amax[$1]=$2
   else {
      if($2<amin[$1]) amin[$1]=$2
      if($2>amax[$1]) amax[$1]=$2
   }
}
END {
  for (i in amin)
    print i,amin[i], amax[i]
}

This User Gave Thanks to vgersh99 For This Post:
# 4  
Old 03-23-2017
Code:
perl -nalF',' -e '
 print "@F[0],MIN,MAX" and next if $. == 1;
 push @{$o{$F[0]}}, $F[1];
 END{ for( sort keys %o ){ @so = sort @{ $o{$_} };
      $l = $so[-1] ? $so[-1] : $so[0];
      print "$_,$so[0],$l" }
 }' mukulverma2408.file


Output:

Code:
Opeation,MIN,MAX
operation1,12321,87934
operation2,12312,72321
operation3,13288,13288
operation4,94865,94865
operation5,27383,27383
operation6,322,93483
operation7,3223,3223

This User Gave Thanks to Aia For This Post:
# 5  
Old 03-23-2017
Hi.

As with other non-oracle solutions such as awk, perl, here is datamash:
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate statistics for grouped data, datamash.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
em() { pe "$*" >&2 ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C datamash

FILE=${1-data1}
E=expected-output.txt

pl " Input data file $FILE:"
cat $FILE

pl " Expected output:"
cat $E

pl " Results:"
datamash -t',' --sort --group=1 min 2 max 2 < data1 |
tee f1

pl " Verify results if possible:"
C=$HOME/bin/pass-fail
[ -f $C ] && $C || ( pe; pe " Results cannot be verified." ) >&2

pl " Details for datamash:"
dixf datamash

exit 0

producing:
Code:
$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.7 (jessie) 
bash GNU bash 4.3.30
datamash (GNU datamash) 1.0.6

-----
 Input data file data1:
operation1,83621
operation2,72321
operation3,13288
operation2,12312
operation1,12321
operation2,45455
operation2,42543
operation1,87934
operation4,94865
operation5,27383
operation6,322
operation6,93483
operation7,3223

-----
 Expected output:
operation1,12321,87934
operation2,12312,72321
operation3,13288,13288
operation4,94865,94865
operation5,27383,27383
operation6,322,93483
operation7,3223,3223

-----
 Results:
operation1,12321,87934
operation2,12312,72321
operation3,13288,13288
operation4,94865,94865
operation5,27383,27383
operation6,322,93483
operation7,3223,3223

-----
 Verify results if possible:

-----
 Comparison of 7 created lines with 7 lines of desired results:
 Succeeded -- files (computed) f1 and (standard) expected-output.txt have same content.

-----
 Details for datamash:
datamash        command-line calculations (man)
Path    : /usr/bin/datamash
Version : 1.0.6
Type    : ELF 64-bit LSB executable, x86-64, version 1 (SYSV ...)
Help    : probably available with -h,--help
Repo    : Debian 8.7 (jessie) 
Home    : http://www.gnu.org/software/datamash

Best wishes ... cheers, drl
This User Gave Thanks to drl For This Post:
# 6  
Old 03-23-2017
Quote:
Originally Posted by mukulverma2408
I saw this problem on one of the forum and solved it using group-by in oracle sql, though I am a bit curious to implement it using shell script
I have actually written a whole article about exactly this:

How to do a "Control Break" (Algorithm)

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
# 7  
Old 03-23-2017
Thanks Every-one, that is really helpful Smilie

---------- Post updated at 05:55 PM ---------- Previous update was at 05:27 PM ----------

Quote:
Originally Posted by Scrutinizer
Hi, try:
Hi Scrutinizer, thanks for the solution, the problem is I am not very well versed with awk, would be really helpful if you can explain what's happening here.

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