Linux Server and Workstation Configuration How To

1. IPv6 Configuration on FreeBSD

...  Oct 17 18:39:45 lola gw6c: Authentication success. Oct 17 18:39:45 lola gw6c: Got tunnel parameters from server. Setting up local tunnel. Oct 17 18:39:45 lola gw6c: Executing configuration script: /bin/sh ...

2. Transfer of static routes to DHCP

... 16 (mask) 172.16.0.0 (network) 10.16.40.100 (gateway) here is script to generate content "option classless-route" in hexadecimal notation for older versions of dhcpd: #!/usr/bin/perl use strict; ...

3. Internet gateway on FreeBSD

... squid Now go back to the firewall. Here is example script. #! /bin/sh # Before we start, reset the list ipfw -q -f flush # Set the prefix command to set the rules cmd = "ipfw -q add"  ...

4. vi editor commands

  Basic vi commands Command Description TERM = terminal_name export TERM Setting Terminal configuration tput init Initialize terminal as terminal_name vi filename Open ...

5. whatis

Command whatis Searches for whole words in the database whatis (see command apropos). Syntax whatis keyword Options no Description whatis command displays the result of search whole words ...

6. wc

... displays only the number of rows. Description wc command displays the number of bytes, words and lines found in the file. If the input file is not specified, wc reads from standard input.  ...

7. uptime

Command uptime Displays the time of continuous operation of the system. Syntax uptime Options no Description uptime utility displays the current time, time of continuous operation of the system, ...

8. uname

...  -v displays the version of the operating system (compilation date). Description The uname command displays various information about the machine and operating system (Linux).  ...

9. unalias

Command unalias Eliminates the abbreviation as defined previously by using the alias. Syntax unalias abbreviation Options no Description command unalias removes the abbreviation as defined ...

10. touch

... of the mentioned file. -t MMDDhhmm uses the specified date and time. Description touch command lets you change the date and time of last modification file (this information is stored with the file). ...

11. top

... priority (for this you should be a privileged user). d interval specifies the interval in seconds between updates of information. Description top command generates full-screen record of running processes ...

12. tar

... in the file file. -v verbose. -z compresses or decompresses the archive with gzip. -j compresses or decompresses the archive through bzip2. Description The tar command creates an archive file, or ...

13. tail

... reads a file at specified intervals and displays the new line. Description tail command displays the last lines of the file. By default last 10 lines of the file.  ...

14. rmdir

Command rmdir Deletes the specified directory (if it is empty). Syntax rmdir [options] directory Options -p remove all parent directories which become empty. Description The command rmdir ...

15. rm

... contained in the catalog. -v displays the names of the files before deleting them. Description The rm command removes the specified files. To delete a file, you must have the right to record the directory ...

16. pwd

Command pwd Prints the current working directory. Syntax pwd Options No Description The command pwd prints the current working directory. It is a built-in command of Bash.  ...

17. pstree

... line. -n sorts the processes by their identifiers (and not by name). -p displays the process IDs. Description Pstree command displays all the processes in the form of a tree - so it's easier to see ...

18. ps

... about memory usage of each process. u displays the user name and start time. x displays processes that are not associated with any terminal. Description The ps command displays the status of processes ...

19. passwd

Command passwd Changes the password. Syntax passwd [username] Options No Description The passwd command changes your password. It asks for old password, and then the new password. If you are ...

20. mv

... -f remove existing files without confirmation. -i asks for confirmation before overwriting existing files. -v displays the name of the file before moving. Description The mv command renames a file ...