使用sed，如何将字符串附加到包含模式且尚未附加字符串的行？

Question

式 我有以下内容的文件

ERR001 just some random text
ERR002 blah blah blah
ERR001 again some text //IGNORE
ERR001 blah blahblah blah blah
ERR002 abc def ghi

我编写一个sed命令，将// IGNORE附加到所有具有ERR001但尚未附加// IGNORE的行。因此sed命令应为上述文件提供以下输出

ERR001 just some random text //IGNORE
ERR002 blah blah blah
ERR001 again some text //IGNORE
ERR001 blah blahblah blah blah //IGNORE
ERR002 abc def ghi

Answer 1

sed 解决方案：

sed '/\/\/IGNORE$/! s/^ERR001 .*/& \/\/IGNORE/' inputfile

• /\/\/IGNORE$/!-否定匹配，确保行不以//IGNORE结尾（!-否定符号）
• s/^ERR001 .*/& \/\/IGNORE/-替换以ERR001开头的行

输出：

ERR001 just some random text //IGNORE
ERR002 blah blah blah
ERR001 again some text //IGNORE
ERR001 blah blahblah blah blah //IGNORE
ERR002 abc def ghi