K.Sun

sed根据模式替换的命令格式是这样的：s/pattern/replacement/flags其中flags可以写数字，数字是多少，就是第几个位置：我们还是看栗子吧。首先新建一个文件名为data的文本作为数据范例：test test test test test当flags没有指定的时候：$ sed 's/test/trail/' data trail test test trail test好，结果

原始数据$ cat data line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 9 line 10删除第3行：$ sed '3d' data line 1 line 2 line 4 line 5 line 6 line 7 line 8 line 9 line 10注意，此时data本身没有改变，删除2,3行：$ sed '

原始数据：$ cat data line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 9 line 10修改第三行：$ sed '3c\ > this line has been changed.' data line 1 line 2 this line has been changed. line 4 line 5 line

原始数据：$ cat data line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 9 line 10将第1,2行保存到新文件中：$ sed '1,2w test' data line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 9 line 10 $ cat

原始数据：$ cat data line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 9 line 10 $ cat tdata This is a joke.将tdata中的数据插入到data中指定的行后：$ sed '4r tdata' data line 1 line 2 line 3 line 4 This is a jo