到目前为止提供的所有答案都假设您了解要替换的文本，这是有意义的，因为这是OP所要求的。我提供的答案假设您对要替换的文本一无所知，并且文件中可能有与您不希望被替换的内容相同或类似的单独行。此外，我假设您知道要替换的行号。

下面的例子演示了如何通过特定的行号删除或更改文本:

# replace line 17 with some replacement text and make changes in file (-i switch)
# the "-i" switch indicates that we want to change the file. Leave it out if you'd
#   just like to see the potential changes output to the terminal window.
# "17s" indicates that we're searching line 17
# ".*" indicates that we want to change the text of the entire line
# "REPLACEMENT-TEXT" is the new text to put on that line
# "PATH-TO-FILE" tells us what file to operate on
sed -i '17s/.*/REPLACEMENT-TEXT/' PATH-TO-FILE

# replace specific text on line 3
sed -i '3s/TEXT-TO-REPLACE/REPLACEMENT-TEXT/'

要做到这一点，不依赖任何GNUisms，如-i不带参数或c不带换行符:

sed '/TEXT_TO_BE_REPLACED/c\
This line is removed by the admin.
' infile > tmpfile && mv tmpfile infile

在这种(POSIX兼容的)命令形式中

c\
text

文本可以由一行或多行组成，应该成为替换的一部分的换行符必须转义:

c\
line1\
line2
s/x/y/

其中s/x/y/是一个新的sed命令后，模式空间已替换为两行

line1
line2

下面的命令对我有用。哪个是处理变量的

sed -i "/\<$E\>/c $D" "$B"

bash-4.1$ new_db_host="DB_HOSTNAME=good replaced with 122.334.567.90"
bash-4.1$ 
bash-4.1$ sed -i "/DB_HOST/c $new_db_host" test4sed
vim test4sed
'
'
'
DB_HOSTNAME=good replaced with 122.334.567.90
'

它运行正常

这和上面那个很相似。

sed 's/[A-Za-z0-9]*TEXT_TO_BE_REPLACED.[A-Za-z0-9]*/This line is removed by the admin./'

我经常使用regex从文件中提取数据，我只是用它来替换文字引号\"与// nothing:-)

cat file.csv | egrep '^\"([0-9]{1,3}\.[0-9]{1,3}\.)' | sed  s/\"//g  | cut -d, -f1 > list.txt