sed替換爲大文本

Question

場景：嘗試使用sed修改大部分httpd配置文件。

我已經試過什麼：

read -d '' _OLD <<"EOF" 
<Directory "/var/www/html"> 

# 
# Possible values for the Options directive are "None", "All", 
# or any combination of: 
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews 
# 
# Note that "MultiViews" must be named *explicitly* --- "Options All" 
# doesn't give it to you. 
# 
# The Options directive is both complicated and important. Please see 
# http://httpd.apache.org/docs/2.2/mod/core.html#options 
# for more information. 
# 
    Options Indexes FollowSymLinks 

# 
# AllowOverride controls what directives may be placed in .htaccess files. 
# It can be "All", "None", or any combination of the keywords: 
# Options FileInfo AuthConfig Limit 
# 
    AllowOverride None 
EOF 

read -d '' _NEW <<"EOF" 
<Directory "/var/www/html"> 

# 
# Possible values for the Options directive are "None", "All", 
# or any combination of: 
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews 
# 
# Note that "MultiViews" must be named *explicitly* --- "Options All" 
# doesn't give it to you. 
# 
# The Options directive is both complicated and important. Please see 
# http://httpd.apache.org/docs/2.2/mod/core.html#options 
# for more information. 
# 
    Options Indexes FollowSymLinks 

# 
# AllowOverride controls what directives may be placed in .htaccess files. 
# It can be "All", "None", or any combination of the keywords: 
# Options FileInfo AuthConfig Limit 
# 
    AllowOverride All 
EOF 

echo -n ${_OLD} 
echo -n ${_NEW} 
sed -i "s/$_OLD/$_NEW/g" /etc/httpd/conf/httpd.conf 

如果您發現唯一改變的事情就是AllowOverride All我只是想修改的規則/var/www/html而不是其他實例因此，爲什麼我期待在這整個街區。

我知道有可能是一個更好的方式做什麼，我試圖完成。方向將不勝感激。

Answer 1

sed -r '\%<Directory "/var/www/html">%,\%</Directory>% s%(AllowOverride)\s+None%\1 All%i' 

Answer 2

爲什麼不使用正則表達式？ Sed本地支持他們。 More details here。

Answer 3

好了，我的（外的日期）版本的sed不允許多行「舊」模式（正則表達式），需要多行更換新行之前有反斜槓，

sed "s/lifetime/birth\ 
…\ 
death/" 

......所以這是一個或兩個問題。另一種方法是，即使您的模式和替換項在其中有斜線，您仍然使用/作爲分隔符。

我建議你使用正則表達式地址：

sed '/<Directory "\/var\/www\/html">/,/AllowOverride/s/AllowOverride None/AllowOverride All/' 

在 其他 的話，做任何適用線（S）的s/AllowOverride None/AllowOverride All/替代一個<Directory "/var/www/html">線 和下一個AllowOverride之間line。 （當心在第一正則表達式的報價。）