inux删除文件中空行的几种方法

[root@test1 test]# cat file
1
2 The world is not you can do, but you should.

o

[root@test1 test]# sed '/^$/d' file
1
2 The world is not you can do, but you should.

o
[root@test1 test]#
[root@test1 test]# sed '/^\s*$/d' file
1
2 The world is not you can do, but you should.
o

[root@test1 test]# grep -v "^\s*$" file
1
2 The world is not you can do, but you should.
o

[root@test1 test]# awk NF file
1
2 The world is not you can do, but you should.
o

[root@test1 test]# awk '!/^$/' file
1
2 The world is not you can do, but you should.

o
未剔除含有空格的空行
[root@test1 test]# awk '!/^[[:space:]]+/ && !/^$/' file
1
2 The world is not you can do, but you should.
o
剔除了含有空格的行