remove exclusivamente linhas indesejadas em vários arquivos

Question

Eu preciso remover dados desnecessários de vários arquivos de saída parte de cada arquivo se parece com isso

# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:18697:4431_2:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# 0 hits found
# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:26276:5181_1:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# Fields: subject title, query acc., subject acc., evalue, q. start, q. end, s. start, s. end
# 1 hits found
FJ712717_(modified) Trypanosoma brucei brucei from mouse 18S ribosomal RNA gene, partial sequence; internal transcribed spacer 1, complete sequence; and 5.8S ribosomal RNA gene, partial sequence  M03117:99:000000000-ALL7G:1:1101:26276:5181_1:N:0:196   FJ712717_(modified) 1.42e-137   1   271 53  323
# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:26276:5181_2:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# Fields: subject title, query acc., subject acc., evalue, q. start, q. end, s. start, s. end
# 1 hits found
FJ712717_(modified) Trypanosoma brucei brucei from mouse 18S ribosomal RNA gene, partial sequence; internal transcribed spacer 1, complete sequence; and 5.8S ribosomal RNA gene, partial sequence  M03117:99:000000000-ALL7G:1:1101:26276:5181_2:N:0:196   FJ712717_(modified) 1.06e-87    1   197 436 236
# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:10339:5290_1:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# 0 hits found
# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:10339:5290_2:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# 0 hits found

As primeiras 4 linhas representam um resultado de saída

# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:7647:16266_2:N:0:215
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# 0 hits found

Eu preciso remover todos os resultados de saída com 0 ocorrências ou seja, todas as 4 linhas (mostradas acima)

Eu notei que com o resultado de: 1 hits encontrados, há 2 linhas extras adicionadas. A sexta linha não começa com o símbolo "#". Como posso usar o

grep -B

comando para fazer isso? Minha saída esperada é um arquivo com apenas o resultado "1 hits encontrados". como abaixo

# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:26276:5181_1:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# Fields: subject title, query acc., subject acc., evalue, q. start, q. end, s. start, s. end
# 1 hits found
FJ712717_(modified) Trypanosoma brucei brucei from mouse 18S ribosomal RNA gene, partial sequence; internal transcribed spacer 1, complete sequence; and 5.8S ribosomal RNA gene, partial sequence  M03117:99:000000000-ALL7G:1:1101:26276:5181_1:N:0:196   FJ712717_(modified) 1.42e-137   1   271 53  323
# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:26276:5181_2:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# Fields: subject title, query acc., subject acc., evalue, q. start, q. end, s. start, s. end
# 1 hits found
FJ712717_(modified) Trypanosoma brucei brucei from mouse 18S ribosomal RNA gene, partial sequence; internal transcribed spacer 1, complete sequence; and 5.8S ribosomal RNA gene, partial sequence  M03117:99:000000000-ALL7G:1:1101:26276:5181_2:N:0:196   FJ712717_(modified) 1.06e-87    1   197 436 236
# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:11481:5777_1:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# Fields: subject title, query acc., subject acc., evalue, q. start, q. end, s. start, s. end
# 1 hits found
JN673389_(modified) Trypanosoma congolense isolate TS07210 18S ribosomal RNA gene, partial sequence; internal transcribed spacer 1, 5.8S ribosomal RNA gene, and internal transcribed spacer 2, complete sequence; and 28S ribosomal RNA gene, partial sequence M03117:99:000000000-ALL7G:1:1101:11481:5777_1:N:0:196   JN673389_(modified) 2.04e-105   1   231 23  253
# BLASTN 2.3.0+
# Query: M03117:99:000000000-ALL7G:1:1101:11481:5777_2:N:0:196
# Database: /home/alex/blast/db/tryps_ITS/tryps_ITS_db
# Fields: subject title, query acc., subject acc., evalue, q. start, q. end, s. start, s. end
# 1 hits found
TCU22315_(modified) Trypanosoma congolense IL1180 18S, 5.8S, 28S-LS1, srRNA1, complete sequence, and 28S-LS2 ribosomal RNA, partial sequence    M03117:99:000000000-ALL7G:1:1101:11481:5777_2:N:0:196   TCU22315_(modified) 1.40e-75    1   156 1176    1021

    

Answer 1

Você pode usar tac para reverter as linhas do arquivo e excluir 3 linhas antes de combinar o padrão, incluindo a linha que contém o padrão correspondente usando sed , assim:

tac filename | sed '/0 hits/I,+3 d' | tac

e se você quiser editar o arquivo no local, você pode usar a opção -i no comando sed como,

tac filename | sed -i '/0 hits/I,+3 d' filename | tac