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1. Tape backups allow for archiving large amounts of data in a sequential access format and are generally cheaper than hard disks. The tar command can be used to create and extract tape archives. 2. Compression tools like gzip, bzip2, zip, etc. compress files to reduce size and allow for more efficient storage and transfer. They each use different algorithms and result in varying file extensions and compression ratios. 3. Remote connection utilities like telnet, ftp, rlogin, rcp, and ssh allow users to access and transfer files between systems. Some like rlogin and rcp rely on .rhosts files for authentication without passwords between trusted hosts.
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Andresen 8 21 02
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This Slide was presented as an introduction to Linux . Students with little experience in free operating systems were encouraged to take up Linux based operating systems.
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This document provides a tutorial on Unix/Linux. It begins with an overview of the Unix system including the kernel, shell, multi-user and multi-process capabilities, and important directory structures. It then covers basic commands, relative and absolute paths, redirecting and piping output, permissions, process management, installing software, text editors, running jobs in the foreground and background, and remote login/file transfer. The goal is to introduce fundamental Unix concepts and commands to new users.
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lec5+.docx
- 2. Create
- 3. Extract
- 5. Compression ratio “ls –l”
- 6. Source disappear or not
- 7. When give the method more than one file
- 8. Syntax [ compress - read compressed file - uncompress ]
- 9. Extension
- 12. Multi-user environment all share same resources
- 14. $ ftp host2
- 17. 331 Password required for user2.
- 19. 230 User user2 logged in.
- 20. Remote system type is UNIX.
- 21. ftp> lcd ~user1
- 22. Local directory now /export/home/user1
- 23. ftp> ls
- 24. 200 PORT command successful.
- 25. 150 Opening ASCII mode data connection for file list.
- 26. dante
- 27. dante_1
- 28. dir1
- 29. dir2
- 30. bye
- 31. ftp anyway ask for the password and the authentication
- 32. Once the prompt of the ftp appears so any command you will run its on the host
- 33. ftp> get : to get files from the remote host mget: for multiple file
- 34. ftp>put : To put files on remote host
- 35. ftp>lcd : To change directory on local host
- 36. ! before any command means to execute this command on local host
- 37. ftp>bye : to quit
- 38. rlogin:
- 39. Similar to the telnet but should be between two Unix platform
- 40. Check for the presence of the $HOME/.rhosts and so you can login without being asked for username or password
- 41. Let’s see this example for illustration
- 42. The default action of rlogin without any option that if you use rlogin you should be the same user on both machines
- 43. $ rlogin host2
- 44. Last login: Mon Mar 6 16:22:12 from host1
- 45. Sun Microsystems Inc. SunOS 5.9 Generic February 2000
- 46. $ uname –n used to check the hostname of machine
- 47. host2
- 48. $ pwd
- 50. $ exit
- 51. Connection to host2 closed.
- 53. rlogin host2host2 should be resolved through /etc/hostshost1Check for $HOME/.rhostsThis name should be resolved through /etc/hostsCheck whether same user or not
- 54. host2 10.10.10.4
- 55. host1 10.10.10.3
- 56. rcp:
- 57. Similar to the concept of FTP but should be between two Unix platform
- 58. Similat to rlogin Check for the presence of the $HOME/.rhosts and so did not ask for username and password
- 59. It is used to copy files between machines remote from each other
- 61. or
- 63. or
- 65. rsh:
- 66. Execute command on remote shell without login
- 68. /etc/dfs/dfstabmkdir myshare mount -f nfs 10.10.10.4:/etc myshare
- 70. Share permanentlyshare /etc
- 71. svcadm enable nfs/server
- 72. In order to enable the service and read configuration file
- 73. OR
- 74. shareall
- 75. Start service and read configuration file
- 81. The /etc physically is on the nfs server and host1 can deal with it as if it is on host1