Linux face Questions (3)

First, the topic

(1) Use Iptables to write out only 22 ports that allow 10.1.8.129 access to this server
(2) Query 1.txt add a line before line seventh, the content is "ABC"
(3) Print out the 6th to 10th line of the 1.txt file
(4) Transfer files larger than 100k in the/usr/local/test directory to the/tmp directory
(5) Print out 1.txt 1th to 3rd column
(6) How to forward the local 80 port request to 8080 port, the current host IP is 192.168.2.18
(7) Write a crontab statement that executes the/usr/bin/waks.day.sh once every morning at 3.
(8) Write a crontab statement that executes a/usr/bin/baks_week.sh every Sunday morning at 4.
(9) How Apache achieves load balancing
(10) How to tell if the file is empty

Second, the answer

(1) iptables-i input-s 10.1.8.179-p tcp--dport 22-j ACCEPT
(2) sed-i ' 7 i\abc ' 1.txt
(3) sed-n ' 6,10 ' P 1.txt
(4) Find-type f-size +100k/usr/local/test-exec mv {}/tmp/\;
(5) Awk-f ': ' {print $1,$2,$3} ' 1.txt
(6) Iptables-t nat-i prerouting-d 192.168.2.18-p tcp--dport 80-j DNAT--to 127.0.0.1:8080
(7) 0 3 * * */bin/bash/usr/bin/waks.day.sh
(8) 0 4 * * 7/bin/bash/usr/bin/baks_week.sh
(9) Multiple machines run Apache, then one of the running Nginx, let Nginx agent more than one Apache to achieve load balancing
(10) [! -S filename]

Linux face Questions (3)