Extract date and time part from filename


 
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# 1  
Old 04-09-2019
Extract date and time part from filename

Hi,

I am facing one scenario in which I need to extract exact position of date and time from the name of the files. For example, Below is the record in which I need to extract position of YYYYMMDD,HHMISS and YYMMDD. Date and time variables can come more than once. I need to use these position and rename ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt file in ABC_123_V01P.YYYYMMDD.HHMISS.txt format i.e. If I receive file as ABC_123_20190401_V01P1234190401190242.txt then I should be able to rename it as ABC_123_V01P.20190401.190242.txt.

Code:
$ cat RECORD
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY
$

I have tried below code but, I am not getting desired result.

My Code -
Code:
$ cat timestamp_format.csv | awk -F"," -v OFS="," '{print $1,$2,$3,$4}' | while IFS="," read FILE_TIMESTAMP FILE_TIMESTAMP_PARAM FILE_TIMESTAMP_REGEX EXP_FILE_TIMESTAMP_FORMAT
do
awk -v OFS="|" -v FILE_TIMESTAMP="${FILE_TIMESTAMP}" -v FILE_TIMESTAMP_REGEX="${FILE_TIMESTAMP_REGEX}" -v EXP_FILE_TIMESTAMP_FORMAT="${EXP_FILE_TIMESTAMP_FORMAT}" 'FNR==NR{a[NR]=$1;b[NR]=$3;c[NR]=$4;CNT=NR;next}
{
SOURCE_FILENAME=$4
TARGET_FILENAME=$5
for (i=1;i<=CNT;i++)
{
VAR=a[i];
DATE_FORMAT_REGEX=b[i];
S1=index($4,VAR);
L1=length(VAR);
S_FTP_FILE_TIMESTAMP1=index(SOURCE_FILENAME,FILE_TIMESTAMP);
L_FTP_FILE_TIMESTAMP1=length(FILE_TIMESTAMP);
TEMP_SOURCE_FILENAME=sub(VAR,DATE_FORMAT_REGEX,SOURCE_FILENAME);
S2=index(SOURCE_FILENAME,VAR);
L2=length(VAR);
S_FTP_FILE_TIMESTAMP2=index(SOURCE_FILENAME,FILE_TIMESTAMP);
L_FTP_FILE_TIMESTAMP2=length(FILE_TIMESTAMP);
for (j=1;j<=CNT;j++)
{
DVAR=a[j];
EXP_DATE_FORMAT=c[j];
DS1=index($5,DVAR);
DL1=length(DVAR);
DS_FILE_TIMESTAMP1=index(TARGET_FILENAME,FILE_TIMESTAMP);
DL_FILE_TIMESTAMP1=length(FILE_TIMESTAMP);
TEMP_TARGET_FILENAME=sub(VAR,DATE_FORMAT_REGEX,TARGET_FILENAME);
DS2=index(TARGET_FILENAME,DVAR);
DL2=length(DVAR);
DS_FILE_TIMESTAMP2=index(TARGET_FILENAME,FILE_TIMESTAMP);
DL_FILE_TIMESTAMP2=length(FILE_TIMESTAMP);
if ( S1 > 0 && DS1 > 0 && S_FTP_FILE_TIMESTAMP1 > 0 && DS_FILE_TIMESTAMP1 > 0 )
{
print $0,S1,L1,substr($4,S1,L1),DATE_FORMAT_REGEX,S_FTP_FILE_TIMESTAMP1,L_FTP_FILE_TIMESTAMP1,FILE_TIMESTAMP,FILE_TIMESTAMP_REGEX,S2,L2,substr($4,S2,L2),DATE_FORMAT_REGEX,S_FTP_FILE_TIMESTAMP2,L_FTP_FILE_TIMESTAMP2,FILE_TIMESTAMP,FILE_TIMESTAMP_REGEX,DS1,DL1,substr($5,DS1,DL1),EXP_DATE_FORMAT,DS_FILE_TIMESTAMP1,DL_FILE_TIMESTAMP1,FILE_TIMESTAMP,FILE_TIMESTAMP_REGEX,EXP_FILE_TIMESTAMP_FORMAT,DS2,DL2,substr($5,DS2,DL2),EXP_DATE_FORMAT,DS_FILE_TIMESTAMP2,DL_FILE_TIMESTAMP2,FILE_TIMESTAMP,FILE_TIMESTAMP_REGEX,EXP_FILE_TIMESTAMP_FORMAT
}
}
}
}' FS="," date_format.csv FS="|" RECORD
done
$

Mapping files used are -
Code:
$ cat date_format.csv
YYYYMMDD,[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9],........,%Y%m%d
YYYY-MM-DD,[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9],....-..-..,%Y-%m-%d
YYYY_MM_DD,[0-9][0-9][0-9][0-9]_[0-9][0-9]_[0-9][0-9],...._.._..,%Y_%m_%d
YYMMDD,[0-9][0-9][0-9][0-9][0-9][0-9],......,%y%m%d
YY-MM-DD,[0-9][0-9]-[0-9][0-9]-[0-9][0-9],..-..-..,%y-%m-%d
DD-MMM-YYYY,[0-9][0-9]-[a-z|A-Z][a-z|A-Z][a-z|A-Z]-[0-9][0-9][0-9][0-9],..-...-....,%d-%b-%Y
DD_MMM_YYYY,[0-9][0-9]_[a-z|A-Z][a-z|A-Z][a-z|A-Z]_[0-9][0-9][0-9][0-9],.._..._....,%d_%b_%Y
D-MMM-YYYY,[0-9]-[a-z|A-Z][a-z|A-Z][a-z|A-Z]-[0-9][0-9][0-9][0-9],.-...-....,%e-%b-%Y
D_MMM_YYYY,[0-9]_[a-z|A-Z][a-z|A-Z][a-z|A-Z]_[0-9][0-9][0-9][0-9],._..._....,%e_%b_%Y
$

Code:
$ cat timestamp_format.csv
XXXXXXXXXX,[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9],..........,%s
HHMISS,[0-9][0-9][0-9][0-9][0-9][0-9],......,%H%M%S
$

Above code is giving me this output, which is wrong -
Code:
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|........|32|6|HHMISS|......|0|8|ABC_123_|........|32|6|HHMISS|......|14|8|YYYYMMDD|%Y%m%d|23|6|HHMISS|......|%H%M%S|0|8|ABC_123_|%Y%m%d|23|6|HHMISS|......|%H%M%S
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|........|32|6|HHMISS|......|0|8|ABC_123_|........|32|6|HHMISS|......|16|6|YYMMDD|%y%m%d|23|6|HHMISS|......|%H%M%S|0|6|ABC_12|%y%m%d|23|6|HHMISS|......|%H%M%S
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|11|6|YYMMDD|......|32|6|HHMISS|......|0|6|ABC_12|......|32|6|HHMISS|......|14|8|YYYYMMDD|%Y%m%d|23|6|HHMISS|......|%H%M%S|0|8|ABC_123_|%Y%m%d|23|6|HHMISS|......|%H%M%S
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|11|6|YYMMDD|......|32|6|HHMISS|......|0|6|ABC_12|......|32|6|HHMISS|......|16|6|YYMMDD|%y%m%d|23|6|HHMISS|......|%H%M%S|0|6|ABC_12|%y%m%d|23|6|HHMISS|......|%H%M%S

Expected Output is as follows -
Code:
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|........|32|6|HHMISS|......|26|6|YYMMDD|......|0|0|||14|8|YYYYMMDD|%Y%m%d|23|6|HHMISS|......|%H%M%S|0|0||||0|0||||

Can someone advise on this code or suggest better approach?
This User Gave Thanks to Prathmesh For This Post:
# 2  
Old 04-09-2019
Hello Prathmesh,

Very good that you have shared all your efforts and tried to post nice stuff with complete details. Sorry but it is still NOT fully clear, if you edit your post with more descriptive details and more descriptive sample input and specially sample expected output it will be easy for us to help you on this one. Keep up the good job of learning and sharing, cheers and enjoy learning on this site Smilie

Thanks,
R. Singh

Last edited by RavinderSingh13; 04-09-2019 at 09:03 AM..
# 3  
Old 04-09-2019
Quote:
Originally Posted by RavinderSingh13
Hello Prathmesh,

Very good that you have shared all your efforts and tried to post nice stuff with complete details. Sorry but it is still NOT fully clear, if you edit your post with more descriptive details and more descriptive sample input and specially sample expected output it will be easy for us to help you on this one. Keep up the good job of learning and sharing, cheers and enjoy learning on this site Smilie

Thanks,
R. Singh
Thanks Ravinder for your attention.

Basically, I have below pipe delimited record as an input in which column 4 has the filename as received on the source side and column 5 has the filename required as an output. In short, we have to rename filename from format in column 4 to format in column 5. But, here date and time parts are variables in specific format. So, I have created 2 mapping files one with name date_format.csv and other with name timestamp_format.csv which will give predefined formats which are expected in input file.

Input Record -
Code:
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY

Expected Output is as follows -
Code:
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|........|32|6|HHMISS|......|26|6|YYMMDD|......|0|0|||14|8|YYYYMMDD|%Y%m%d|23|6|HHMISS|......|%H%M%S|0|0||||0|0||||

In the above expected output,
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEG ORY ---- This part is same as input
9|8|YYYYMMDD|........ ---- 9 is start position of format YYYYMMDD, 8 is length of format YYYYMMDD, YYYYMMDD is date format as mentioned in date_format.csv and ........ is the number of characters in format YYYYMMDD as metioned in date_format.csv.
32|6|HHMISS|...... ---- 32 is start position of format HHMISS, 6 is length of format HHMISS, HHMISS is time format as mentioned in timestamp_format.csv and ...... is the number of characters in format HHMISS as metioned in timestamp_format.csv.
26|6|YYMMDD|...... ---- 26 is start position of format YYMMDD, 6 is length of format YYMMDD, YYMMDD is date format as mentioned in date_format.csv and ...... is the number of characters in format YYMMDD as metioned in date_format.csv.
0|0|| ---- As we do not have second set of HHMISS the results are start_position=0,length=0,format blank (we can keep format as HHMISS|...... if it is easy)
Above part is checked against column 4 and below part is checked against column 5.
14|8|YYYYMMDD|%Y%m%d ---- 14 is start position of format YYYYMMDD, 8 is length of format YYYYMMDD, YYYYMMDD is date format as mentioned in date_format.csv , ........ is the number of characters in format YYYYMMDD as metioned in date_format.csv and %Y%m%d is the date format for YYYYMMDD in date command also defined in date_format.csv.
23|6|HHMISS|......|%H%M%S ---- 23 is start position of format HHMISS, 6 is length of format HHMISS, HHMISS is time format as mentioned in timestamp_format.csv , ...... is the number of characters in format HHMISS as metioned in timestamp_format.csv and %H%M%S is the time format for HHMISS in date command also defined in timestamp_format.csv.
0|0||||0|0|||| ---- remaining parameters are 0 or blank as they represent second occurance of date/time in start_position, length, date/time format, character regex and respective format of date command.

Hope this clarifies the requirement. Let me know if it is still not clear or if you have any better approach to extract date/time part.
# 4  
Old 04-10-2019
This is not easy a request, both to understand and to implement. I have understood that you want to search two input fields, $4 and $5, for date/Ttime format descriptors, and append their metadata to the line. Additional data that shows up in your desired output, as ......, |0|0|, or %Y%m%d are even harder to implement as specified. Try this a a first starting point:


Code:
awk -F"|" '
BEGIN   {MXFM = split ("YYYYMMDD|YYMMDD|HHMISS", FMT)
        }

        {printf "%s", $0
         for (j=4; j<=5; j++)   {TMP = $j
                                 PTR = 0
                                 for (i=1; i<=MXFM; i++) if (match (TMP, FMT[i]))       {printf "|%s|%s|%s|...", PTR + RSTART, RLENGTH, substr (TMP, RSTART, RLENGTH)
                                                                                         TMP = substr (TMP, RSTART+RLENGTH)
                                                                                         PTR += RSTART + RLENGTH - 1
                                                                                        }
                                }
         print ""
        }
'  OFS="|" file
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|...|26|6|YYMMDD|...|32|6|HHMISS|...|14|8|YYYYMMDD|...|23|6|HHMISS|...

and see how far it gets you.
This User Gave Thanks to RudiC For This Post:
# 5  
Old 04-10-2019
Thanks for your help. I will try this out and see how it goes.
# 6  
Old 04-10-2019
Quote:
Originally Posted by RudiC
This is not easy a request, both to understand and to implement. I have understood that you want to search two input fields, $4 and $5, for date/Ttime format descriptors, and append their metadata to the line. Additional data that shows up in your desired output, as ......, |0|0|, or %Y%m%d are even harder to implement as specified. Try this a a first starting point:


Code:
awk -F"|" '
BEGIN   {MXFM = split ("YYYYMMDD|YYMMDD|HHMISS", FMT)
        }

        {printf "%s", $0
         for (j=4; j<=5; j++)   {TMP = $j
                                 PTR = 0
                                 for (i=1; i<=MXFM; i++) if (match (TMP, FMT[i]))       {printf "|%s|%s|%s|...", PTR + RSTART, RLENGTH, substr (TMP, RSTART, RLENGTH)
                                                                                         TMP = substr (TMP, RSTART+RLENGTH)
                                                                                         PTR += RSTART + RLENGTH - 1
                                                                                        }
                                }
         print ""
        }
'  OFS="|" file
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|...|26|6|YYMMDD|...|32|6|HHMISS|...|14|8|YYYYMMDD|...|23|6|HHMISS|...

and see how far it gets you.
Thanks RudiC. This is very close, I will try to build on your solution and see how I can use it.
Only difference is I want same number of "." characters as in YYYYMMDD, YYMMDD or HHMISS.

So, Output will look like this -
Code:
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|........|26|6|YYMMDD|......|32|6|HHMISS|......|14|8|YYYYMMDD|........|23|6|HHMISS|......

Also, Instead of hardcoding YYYYMMDD, YYMMDD and HHMISS in split ("YYYYMMDD|YYMMDD|HHMISS", FMT) can we use separate files to pass them. I am trying to use below files.

Code:
$ cat RECORD
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY

Code:
$ cat date_format.csv
YYYYMMDD,[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9],........,%Y%m%d
YYYY-MM-DD,[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9],....-..-..,%Y-%m-%d
YYYY_MM_DD,[0-9][0-9][0-9][0-9]_[0-9][0-9]_[0-9][0-9],...._.._..,%Y_%m_%d
YYMMDD,[0-9][0-9][0-9][0-9][0-9][0-9],......,%y%m%d
YY-MM-DD,[0-9][0-9]-[0-9][0-9]-[0-9][0-9],..-..-..,%y-%m-%d
DD-MMM-YYYY,[0-9][0-9]-[a-z|A-Z][a-z|A-Z][a-z|A-Z]-[0-9][0-9][0-9][0-9],..-...-....,%d-%b-%Y
DD_MMM_YYYY,[0-9][0-9]_[a-z|A-Z][a-z|A-Z][a-z|A-Z]_[0-9][0-9][0-9][0-9],.._..._....,%d_%b_%Y
D-MMM-YYYY,[0-9]-[a-z|A-Z][a-z|A-Z][a-z|A-Z]-[0-9][0-9][0-9][0-9],.-...-....,%e-%b-%Y
D_MMM_YYYY,[0-9]_[a-z|A-Z][a-z|A-Z][a-z|A-Z]_[0-9][0-9][0-9][0-9],._..._....,%e_%b_%Y

Code:
$ cat timestamp_format.csv
XXXXXXXXXX,[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9],..........,%s
HHMISS,[0-9][0-9][0-9][0-9][0-9][0-9],......,%H%M%S

So, I am trying to write awk using three files RECORD, date_format.csv and timestamp_format.csv to achieve below output.

Code:
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|........|26|6|YYMMDD|......|32|6|HHMISS|......|14|8|YYYYMMDD|........|23|6|HHMISS|......

Kindly advise how can I use awk on these three files.
# 7  
Old 04-10-2019
Hmmmm - not quite clear yet when you want the dots, and when the printf format strings, or when both... See how far this gets you:



Code:
awk '
FNR == 1        {FILENR++
                }
FILENR <= 2     {CNT++
                 CHFM[CNT] = $1
                 RGEX[CNT] = $2
                 DOTS[CNT] = $3
                 FMTS[CNT] = $4
                 next
                }
                {printf "%s", $0
                 for (j=4; j<=5; j++)   {TMP = $j
                                         PTR = 0
                                         for (i=1; i<=CNT; i++) if (match (TMP, CHFM[i]))       {printf "|%s|%s|%s|%s|%s", PTR + RSTART, RLENGTH, CHFM[i], DOTS[i], FMTS[i]
                                                                                                 TMP = substr (TMP, RSTART+RLENGTH)
                                                                                                 PTR += RSTART + RLENGTH - 1
                                                                                                }
                                        }
                 print ""
                }
'  FS=","  *format.csv FS="|" OFS="|" RECORD
SOURCE|LOGIN|SERVER|ABC_123_YYYYMMDD_V01P1234YYMMDDHHMISS.txt|ABC_123_V01P.YYYYMMDD.HHMISS.txt|CATEGORY|9|8|YYYYMMDD|........|%Y%m%d|26|6|YYMMDD|......|%y%m%d|32|6|HHMISS|......|%H%M%S|14|8|YYYYMMDD|........|%Y%m%d|23|6|HHMISS|......|%H%M%S

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