更清洁的方式来写入多个sed命令？(Cleaner way to write multiple sed commands?)

更清洁的方式来写入多个sed命令？(Cleaner way to write multiple sed commands?)

是否有更多的DRY方式来编写下列命令（将它们放入bash shell脚本中）：

sudo sed -i 's/^#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config sudo sed -i 's/PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config sudo sed -i 's/^#PermitEmptyPasswords yes/PermitEmptyPasswords no/' /etc/ssh/sshd_config sudo sed -i 's/PermitEmptyPasswords yes/PermitEmptyPasswords no/' /etc/ssh/sshd_config sudo sed -i 's/^#PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config sudo sed -i 's/PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config sudo sed -i 's/^#X11Forwarding yes/X11Forwarding no/' /etc/ssh/sshd_config sudo sed -i 's/X11Forwarding yes/X11Forwarding no/' /etc/ssh/sshd_config

Is there a more DRY way to write the following commands (will be putting them in a bash shell script):

sudo sed -i 's/^#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config sudo sed -i 's/PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config sudo sed -i 's/^#PermitEmptyPasswords yes/PermitEmptyPasswords no/' /etc/ssh/sshd_config sudo sed -i 's/PermitEmptyPasswords yes/PermitEmptyPasswords no/' /etc/ssh/sshd_config sudo sed -i 's/^#PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config sudo sed -i 's/PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config sudo sed -i 's/^#X11Forwarding yes/X11Forwarding no/' /etc/ssh/sshd_config sudo sed -i 's/X11Forwarding yes/X11Forwarding no/' /etc/ssh/sshd_config

最满意答案

由于要匹配的模式相似，因此可以使用4个字符串的替代方法并捕获它。 使字符串开头的#为可选。

以下将结合成一个：

sed -i -r 's/^#?(PermitRootLogin|PermitEmptyPasswords|PasswordAuthentication|X11Forwarding) yes/\1 no/' /etc/ssh/sshd_config

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如果您的sed版本不支持扩展正则表达式，则可以这样说：

sed -i 's/^#\{0,1\}\(PermitRootLogin\|PermitEmptyPasswords\|PasswordAuthentication\|X11Forwarding\) yes/\1 no/' /etc/ssh/sshd_config

Since the patterns to be matched are similar, you could make use of alternation for the 4 strings and capture it. Make the # at the beginning of the string optional.

The following would combine those into one:

sed -i -r 's/^#?(PermitRootLogin|PermitEmptyPasswords|PasswordAuthentication|X11Forwarding) yes/\1 no/' /etc/ssh/sshd_config

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If your version of sed doesn't support extended regular expressions, you could say:

sed -i 's/^#\{0,1\}\(PermitRootLogin\|PermitEmptyPasswords\|PasswordAuthentication\|X11Forwarding\) yes/\1 no/' /etc/ssh/sshd_config