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

你需要在前后使用通配符(.*)来替换整行:

sed 's/.*TEXT_TO_BE_REPLACED.*/This line is removed by the admin./'

您可以使用change命令替换整行，并使用-i标志进行适当的更改。例如，使用GNU sed:

sed -i '/TEXT_TO_BE_REPLACED/c\This line is removed by the admin.' /tmp/foo

用于配置文件的操作

我受到skensell答案的启发想出了这个解决方案

保密[搜索][重播][文件]

它将:

如果不存在，则创建该文件 替换searchPattern匹配的整行(所有行) 如果没有找到pattern，则在文件末尾添加replaceLine

功能:

function configLine {
  local OLD_LINE_PATTERN=$1; shift
  local NEW_LINE=$1; shift
  local FILE=$1
  local NEW=$(echo "${NEW_LINE}" | sed 's/\//\\\//g')
  touch "${FILE}"
  sed -i '/'"${OLD_LINE_PATTERN}"'/{s/.*/'"${NEW}"'/;h};${x;/./{x;q100};x}' "${FILE}"
  if [[ $? -ne 100 ]] && [[ ${NEW_LINE} != '' ]]
  then
    echo "${NEW_LINE}" >> "${FILE}"
  fi
}

疯狂的退出状态魔术来自https://stackoverflow.com/a/12145797/1262663

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/'

将包含指定字符串的整行替换为该行的内容

文本文件:

Row: 0 last_time_contacted=0, display_name=Mozart, _id=100, phonebook_bucket_alt=2
Row: 1 last_time_contacted=0, display_name=Bach, _id=101, phonebook_bucket_alt=2

单一的字符串:

$ sed 's/.* display_name=\([[:alpha:]]\+\).*/\1/'
output:
100
101

由空格分隔的多个字符串:

$ sed 's/.* display_name=\([[:alpha:]]\+\).* _id=\([[:digit:]]\+\).*/\1 \2/'
output:
Mozart 100
Bach 101

调整regex以满足您的需要

[:alpha]和[:digit:] 字符类和括号表达式