Question

INPUT：

Define {
     abcd **pattern**
     xyzs wedlenle
     jqwd sadjkjnd 
} 
Define { 
     abcd asjdanja
     xyzs wedlenle
     jqwd sadjkjnd
}
Define {
     abcd **pattern**
     xyzs wedlenle
     jqwd sadjkjnd 
     ADD LINE HERE
}

预期输出：

Define {
     abcd **pattern**
     xyzs wedlenle
     jqwd sadjkjnd 
     ADD LINE HERE
} 
Define { 
     abcd asjdanja
     xyzs wedlenle
     jqwd sadjkjnd
}
Define {
     abcd **pattern**
     xyzs wedlenle
     jqwd sadjkjnd 
     ADD LINE HERE
}

需要** ADD LINE **在“}”之前定义块。

转角案例： 1）多个模式 - 在循环中使用 2）增加的线应该是空间领先的 3）只有在同一块中不存在的情况下才添加行。

Answer 1

$ cat test.awk
BEGIN {
    RS=ORS="}"
} 
{   # BELOW         don't print:       print:
    print $0 ($0 !~ /ADD LINE/ && $0 ~ /PATTERN/? "     ADD LINE HERE\n" :"")
}

测试文件：

$ cat > test.txt
Define {
     has PATTERN
     no add line
     so add it here
} 
Define {
     has PATTERN
     has ADD LINE
     dont add it here
} 
Define { 
     no pattern
     no add line
     dont add it here
}

试运行：

$ awk -f test.awk test.txt
Define {
     has PATTERN
     no add line
     so add it here
     ADD LINE HERE
} 
Define {
     has PATTERN
     has ADD LINE
     dont add it here
} 
Define { 
     no pattern
     no add line
     dont add it here
}

Answer 2

$ awk '
/}/ {
    if (f) {
        sub(/[^[:space:]].*/,"",prev)
        print prev "ADD LINE HERE"
        f=0
    }
}
/pattern/ { f=1 }
{ prev=$0; print }
' file
Define {
     abcd **pattern**
     xyzs wedlenle
     jqwd sadjkjnd
     ADD LINE HERE
}
Define {
     abcd asjdanja
     xyzs wedlenle
     jqwd sadjkjnd
}

使用AWK在模式之间添加文本

2 个答案: