请教一个正则

nogroup

内容如下：
Host 202.101.76.200.static.redip.inext.net.mx (200.76.101.202) appears to be up ... good.
Interesting ports on 202.101.76.200.static.redip.inext.net.mx (200.76.101.202):
Not shown: 1133 closed ports
PORT     STATE    SERVICE
21/tcp   open     ftp
22/tcp   filtered ssh
23/tcp   open     telnet
53/tcp   open     domain
80/tcp   open     http
443/tcp  open     https
2000/tcp open     sieve
8080/tcp filtered webcache

Read data files from: /etc
Nmap done: 1 IP address (1 host up) scanned in 17.83 seconds


如何取到如上内容的PORT  STATE  SERVICE下面的第一列内容，即 21/tcp  22/tcp 23/tcp 53/tcp 80/tcp 443/tcp 2000/tcp 8080/tcp ( 将列的内容放在一行)

yy_galois

gawk 'NF==3' hostport.txt  | gawk '$1~/tcp/  {print $1} '

或者

gawk 'NF==3 && $1~/tcp/ {print $1}' hostport.txt

[ 本帖最后由 yy_galois 于 2009-6-30 17:00 编辑 ]

thinshootout

nawk '/^PORT/,/^$/{print $1}' urfile | nawk '/\/tcp/{printf("%s ",$1)}END{print}'

[ 本帖最后由 thinshootout 于 2009-6-30 17:02 编辑 ]

wtuter

[W]cat 1
Host 202.101.76.200.static.redip.inext.net.mx (200.76.101.202) appears to be up ... good.
Interesting ports on 202.101.76.200.static.redip.inext.net.mx (200.76.101.202):
Not shown: 1133 closed ports
PORT     STATE    SERVICE
21/tcp   open     ftp
22/tcp   filtered ssh
23/tcp   open     telnet
53/tcp   open     domain
80/tcp   open     http
443/tcp  open     https
2000/tcp open     sieve
8080/tcp filtered webcache

Read data files from: /etc
Nmap done: 1 IP address (1 host up) scanned in 17.83 seconds

[W]awk 'NR>4&&$1~/^[0-9]/{printf "%s ",$1}' 1
21/tcp 22/tcp 23/tcp 53/tcp 80/tcp 443/tcp 2000/tcp 8080/tcp

MYSQLER

awk 'NR>=5&&NR<=12{print $1}' file | tr '\n'  ' '

awk 'NR>=5&&NR<=12{printf "%s",$1}' file

[ 本帖最后由 MYSQLER 于 2009-6-30 17:17 编辑 ]

liaosnet

awk '/[0-9]+\/tcp/{printf $1""$FS}END{print ""}' ufile

zjdick

awk '/^[0-9]+\/[A-Za-z]+/{print $1}' 1|tr -s "\n" " "
21/tcp 22/tcp 23/tcp 53/tcp 80/tcp 443/tcp 2000/tcp 8080/tcp

[ 本帖最后由 zjdick 于 2009-6-30 17:24 编辑 ]

Minsic

awk '/^PORT/,/^ *$/{if($1~/^[0-9]+/)printf $1" "}END{printf "\n"}' urfile

lucash

awk '/^[0-9]+/ {printf $1" "}' urfile

[ 本帖最后由 lucash 于 2009-6-30 17:33 编辑 ]