Print only fields of matched header starting after matched records
Question
I'm trying to extract specific fields from my file. Basically, output fields only containing a matched expression, with output starting after the matched records.
This is an example of my input. Sometimes the fields are in different orders as well as having a different number of lines before the header I'm trying to match.
I was having a hard time finding out how to achieve this with cut and sed commands and couldn't quite find an awk method.
CGATS.17
FORMAT_VERSION 1
KEYWORD "SampleID"
KEYWORD "SAMPLE_NAME"
NUMBER_OF_FIELDS 45
WEIGHTING_FUNCTION "ILLUMINANT, D50"
WEIGHTING_FUNCTION "OBSERVER, 2 degree"
BEGIN_DATA_FORMAT
SampleID SAMPLE_NAME CMYK_C CMYK_M CMYK_Y CMYK_K LAB_L LAB_A LAB_B nm380 nm390 nm400
END_DATA_FORMAT
NUMBER_OF_SETS 182
BEGIN_DATA
1 1 40 40 40 0 62.5 6.98 4.09 0.195213 0.205916 0.212827
2 2 0 40 40 0 73.69 25.48 24.89 0.200109 0.211081 0.218222
3 3 40 40 0 0 63.95 12.14 -20.91 0.346069 0.365042 0.377148
4 4 0 70 70 0 58.91 47.69 35.54 0.080033 0.084421 0.087317
END_DATA
This is the dirty code I used which mostly did the job but without the field header conditional search. The awk command is just to remove empty lines surrounding the output.
cut -f 7-9 -s input.txt |
sed -E 's/(LAB_.)//g' |
awk 'NF' > file.txt
The output I would expect appears like this. It's still tab-delimited containing only the values of the fields starting directly under (LAB_.)
62.5 6.98 4.09
73.69 25.48 24.89
63.95 12.14 -20.91
58.91 47.69 35.54
No correct solution