bash - 使用 awk 在文件中搜索

Question

我需要像哈希一样在文件中搜索。想知道 awk 是否是正确的解决方案

输入示例：

bla   123.123.123.0
# This line should be a comment
ble      www.ble.com
bli  <random whitespace> ::1
blo   anything

根据上下文，我需要两个不同的输出：

获取密钥：

bla ble bli blo

并搜索（ble）

www.ble.com

我希望这是微不足道的awk

编辑：改进了输入格式的描述

Answer 1

像这样的一种方式（要求不是很清楚）：

$ awk '!/^#/{a[$1]=$2}END{print a[x];}' x='ble' file
www.ble.com

Answer 2

获取密钥：

kent$  grep -oP "^\w+(?= )" file
bla
ble
bli
blo

如果您希望它们与 awk 放在一行中

kent$  awk 'NR!=2{printf $1" "}' test
bla ble bli blo 

Answer 3

不是很清楚格式...首先这个怎么样？

$ awk '/^[^#]/{print $1}/www/{print $2}' input.txt
bla
ble
www.ble.com
bli
blo

或“两个不同的输出：

/^[^#]/ {
    k[$1]++
}
/www/ {
    w[$2]++
}

END {
    print "keys:"
    for (x in k)
        print "\t"x
    print "urls:"
    for (x in w)
        print "\t"x

}

输出：

$ awk -f keys.awk input.txt
keys:
    bla
    ble
    bli
    blo
urls:
    www.ble.com