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awk '{print $0 > $0".txt" }'  inputfile

Or

awk '{print $0 > "output_file." NR }' inputfile

awk '{print > $0".txt" }'  inputfile

would create one file per unique line in inputfile named after the content of those lines (with a .txt extension). But beware that when the limit of concurrent open files is reached, some awk implementations will fail.

Or

awk '{f = "output_file." NR; print $0 > f; close(f)}' inputfile

To have numbered output files.

awk '{print $0 > $0".txt" }'  inputfile

Or

awk '{i++}{print $0 > "output_file."i }' inputfile

awk '{print $0 > $0".txt" }'  inputfile

Or

awk '{print $0 > "output_file." NR }' inputfile

awk '{print $0 > $0".txt" }'  inputfile

Or

awk '{i++}{print $0 > "output_file."i }' test.txt

awk '{print $0 > $0".txt" }'  inputfile

Or

awk '{i++}{print $0 > "output_file."i }' inputfile