linux 中grep命令如何匹配空白字符

 

001、

[root@pc1 test2]# ls
a.txt
[root@pc1 test2]# cat a.txt                 ## 测试数据
NC_003074.8     1000177 1000243 exon141402
NC_003074.8     1000177 1000243 exon141414
NC_003070.9     3630    3913    exon1
NC_003070.9     3995    4276    exon2
NC_003070.9     4485    4605    exon3
[root@pc1 test2]# grep "3630    3913" a.txt
[root@pc1 test2]# grep "3630\t3913" a.txt
[root@pc1 test2]# grep "3630[\t ]\+3913" a.txt
[root@pc1 test2]# grep "3630[[:space:]]3913" a.txt    ## grep中空格匹配
NC_003070.9     3630    3913    exon1
[root@pc1 test2]# grep "1000177[[:space:]]1000243" a.txt    ## 匹配空格
NC_003074.8     1000177 1000243 exon141402
NC_003074.8     1000177 1000243 exon141414