用sed删除空行
我的代码如下:
class Song
def initialize(name)
@name = name
end
def tell
puts @name
end
end
class ZhouSong < Song
def initialize(name,artist)
super(name)
@artist = artist
end
def tell
super
puts @artist
end
def name=(newName)
@name = newName
end
attr_writer :artist
end
s = Song.new("song")
s.tell
zs = ZhouSong.new("zhousong","zhoujielun")
zs.tell
zs.name = "name : new zhou song"
zs.tell
zs.artist = "artist : zhoujielun "
zs.tell
我希望删除所有的空行,可以用sed来实现
文件名是a.rb
more a.rb | sed "/^\s*$/d"
结果如下:
class Song
def initialize(name)
@name = name
end
def tell
puts @name
end
end
class ZhouSong < Song
def initialize(name,artist)
super(name)
@artist = artist
end
def tell
super
puts @artist
end
def name=(newName)
@name = newName
end
attr_writer :artist
end
s = Song.new("song")
s.tell
zs = ZhouSong.new("zhousong","zhoujielun")
zs.tell
zs.name = "name : new zhou song"
zs.tell
zs.artist = "artist : zhoujielun "
zs.tell
如果您想直接修改文件,那么可以用
sed -i "/^\s*$/d" a.rb