Question

我正在尝试使用SED对CUPS配置文件进行一些更改。

我想要做的是找到以下文字：

# Restrict access to the server...
<Location />
  Order allow, deny

并将其附加到它：

  Allow from all

我已经尝试了sed '/# Restrict access to the server...\n<Location />\n Order allow, deny\n/ a\ Allow from all' etc/cups/cupsd.conf，但我不知道如何逃避＆gt;，并且在它前面添加一个反斜杠不起作用。

Answer 1

这对你有用：

sed 'N;/<Location \/>\n *Order allow, deny/s//&\n  Allow from all/;P;D' file

或者

sed $'N;/<Location \\/>\\n *Order allow, deny/a\\\nAllow from all\nP;D;' file

实施例

$ sed 'N;/<Location \/>\n *Order allow, deny/s//&\n  Allow from all/;P;D' cups.in
# other stuff here
# Restrict access to the server...
<Location />
  Order allow, deny
  Allow from all
</Location>
stuff

$ sed $'N;/<Location \\/>\\n *Order allow, deny/a\\\n  Allow from all\nP;D;' cups.in
# other stuff here
# Restrict access to the server...
<Location />
  Allow from all
  Order allow, deny
</Location>
stuff

请注意，添加Allow from all的顺序是不同的，尽管我不认为这会使功能有所不同。

Answer 2

这可能对您有用：

sed '/# Restrict access to the server/{$!N;$!N;s/<Location \/>\n  Order allow, deny$/&\n  Allow from all/}' file

或者这个：

sed ':a;$!{N;ba};s/# Restrict access to the server[^\n]*\n<Location \/>\n  Order allow, deny[^\n]*/&\n  Allow from all/' file

或者很可能是这个（GNU awk？）：

sed '/# Restrict access to the server/,+3s/Order allow, deny/&\n  Allow from all/' file

使用sed在文件中插入一些文本

2 个答案:

实施例