Linux Server and Workstation Configuration How To

1. Internet gateway on FreeBSD

... and somewhere to climb on the lo0 $cmd 030 deny ip from any to 127.0.0.0/8 $cmd 040 deny ip from 127.0.0.0/8 to any # Send all on a transparent squid $cmd 050 fwd 127.0.0.1,3129 tcp from $lannet ...

2. killall

... send a signal equal to 9 (signal destruction).  ...

3. kill

Command - kill Kill command sends a signal to the process. Syntax kill [options] id_process Options -Nsignal sends a specified signal (where Nsignal - the number or name). -l displays the number ...

4. diff

... slows down the diff). -e generates a script editor ed to convert the file first_file in second_file. -f generates output similar to -e, but in reverse order. -i ignores case of characters. -l sends ...

5. Send Mail Script

Mail content text is /tmp/message.txt # mail -s 'Server Status Report' george@example.com -c Jon@example.com < /tmp/message.txt Send Mail With Attachment # !/bin/bash # tar -zcf /tmp/backup.tar.gz ...

6. Linux, UNIX User Management Commands

...      wall Send a message to everybody's terminal.     who Display the users logged in.     whoami Print effective user id. Get ...

7. Default Port Numbers

... null discard 9/udp sink null systat 11/tcp users daytime 13/tcp daytime 13/udp netstat 15/tcp qotd 17/tcp quote msp 18/tcp # message send protocol msp 18/udp # message send protocol ...