|
藍森林 http://www.lslnet.com 2006年6月26日 11:18
 請教大家一個AWK的腳本！
最近移植djbdns到ARM上，裡面有一個AWK的腳本，我看不太懂，想請大家幫忙分析一下，看看主要是實現什麼功能的，多謝大家了！
awk -F: '
BEGIN { OFS=":" }
{
if ($5 == "tx") next
if ($5 == "A") {
print "glue",$6,$3,$4,"answer",$6" A "$7
next
}
if ($5 == "NS") {
print "glue",$6,$3,$4,"answer",$6" NS "$7
next
}
print
}
' | sort -t: +0 -2 +4 +3 -4 +2 -3 | uniq | awk -F: '
{
type = $1
q = $2
c = $3
ip = sprintf("%-16s",$4)
if (q != lastq) { print ""; lastq = q }
if ($5 == "ALERT") {
result = "A\bAL\bLE\bER\bRT\bT:\b: " $6
}
else if ($5 == "answer") {
if (index($6,q" ") == 1)
$6 = substr($6,length(q) + 2)
result = $6
}
else if ($5 == "see") {
result = "see " $6
}
else if ($5 == "CNAME") {
result = "CNAME "$6
}
else
result = $5
if (c != ".") {
q = substr(q,1,length(q) - length(c))
for (i = 1;i <= length(c);++i) {
ci = substr(c,i,1)
q = q "_\b" ci
}
}
print type,q,ip,result
}
' |
請教大家一個AWK的腳本！
NS A tx "A\bAL\bLE\bER\bRT\bT:\b: "看這個應該是過濾一些DNS記錄重新格式化排序送給less或什麼程序閱讀的 |
| |
