Remove a set of rows from a file separated by a white line having a specific key word

Question

I have a file containing lines as given below. I want to delete a set of rows from the file, if any line from a set of rows contains key word SEDS2-TOP. Each set of rows is

Answer 1

separated by a white line should lead you to paragraph mode.

Perl:

$ perl -00 -ne 'print if !/SEDS2-TOP/' sample.txt
0.00  600.00  2214.28   785.71 1.00000 SEDS1-BOTTOM
0.00  600.00  2214.28   785.71 1.00000 SEDS1-TOP
0.00  600.00  1500.00     0.00 1.00000 WATER-BOTTOM

0.00  400.00  2004.28   785.71 1.00000 SEDS1-BOTTOM
0.00  300.00  2254.28   785.71 1.00000 SEDS1-TOP
0.00  600.00  1600.00     0.00 1.00000 WATER-BOTTOM

• -00 enable paragraph mode
• -n don't print by default
• print if !/SEDS2-TOP/ - print paragraph only if it doesn't match

AWK variant:

$ awk -v RS= -v ORS='\n\n' '!/SEDS2-TOP/' sample.txt

0.00  600.00  2214.28   785.71 1.00000 SEDS1-BOTTOM
0.00  600.00  2214.28   785.71 1.00000 SEDS1-TOP
0.00  600.00  1500.00     0.00 1.00000 WATER-BOTTOM

0.00  400.00  2004.28   785.71 1.00000 SEDS1-BOTTOM
0.00  300.00  2254.28   785.71 1.00000 SEDS1-TOP
0.00  600.00  1600.00     0.00 1.00000 WATER-BOTTOM

• -v RS= - enable paragraph mode
• -v ORS='\n\n'- separate output with one new line
• !/SEDS2-TOP/ - print only if the paragraph doesn't match

A cumbersome approach to "move" the matching records into a new file would be:

perl -00 -i -ne 'if (!/SEDS2-TOP/) { print } else {print STDERR}' sample.txt 2>sample2.txt

• -i modifies sample.txt in place
• print STDERR - will print non matching lines into on STDERR
• 2>sample2.txt - saves the STDERR into the new file.

However, that requires in-place editing and not many textutils have that. Easiest approach is to create two new files, ones with the mathing records and one with non matching ones.

awk -v RS= -v ORS='\n\n' '!/SEDS2-TOP/' sample.txt >not_maching.txt
awk -v RS= -v ORS='\n\n' '/SEDS2-TOP/' sample.txt  >matching.txt