linux ftp .netrc 自动登录脚本 auto-login
[root@localhost ~]# cat .netrc
machine hostname
login root
password rootpassword
macdef init
cd /root/
bin
put a.txt
quit
机器 hostname
username 用户名
password 密码
宏脚本 macdef
init自动执行
引用: http://www.mavetju.org/unix/netrc.php
How to use ftp in combination with .netrc
After answering a number of questions regarding automatic FTP on Unix-systems and the involvement of .netrc in it, I created this little guide.
Permissions and location of the .netrc
The .netrc should be in your home-directory and the permissions on the file should be unreadable for everybody except the owner:
[~] edwin@k7>ls -al .netrc -rw------- 1 edwin wheel 246 Aug 27 16:14 .netrc |
You can set to these settings with chmod 600 .netrc .
Layout of the .netrc
Machine definitions
The first part of the .netrc is filled up with host-definitions:
machine ftp.freebsd.org login anonymous password [email protected] machine myownmachine login myusername password mypassword |
What it is saying now is nothing more than "If you connect to ftp.freebsd.org , login as anonymous and use [email protected] as password." and "If you connect to myownmachine , login as myusername and use mypassword as password.".
Macro definitions
This part of the .netrc consists of macros which can be used to perform automated tasks:
macdef uploadtest cd /pub/tests bin put filename.tar.gz quit macdef dailyupload cd /pub/tests bin put daily-$1.tar.gz quit |
Keep in mind that there should be an empty line after the last macdef statement. If you don't do this, ftp will complain about it.
The first one is saying "Go to the /pub/tests directory, switch to binary mode, put a file there and quit it". The second one is saying the same, except that the name of the file is based on a parameter on the macro-call (see Usage of the .netrc for more about this).
Usage of the .netrc
Macros can be called from both inside ftp:
[~] edwin@k7>ftp myownmachine ftp: connect to address ::1: Connection refused Trying 127.0.0.1... Connected to localhost. 220 myownmachine FTP server (Version 6.00LS) ready. 331 Password required for myusername. 230 User myusername logged in. Remote system type is UNIX. Using binary mode to transfer files. ftp> $ uploadtest cd temp 250 CWD command successful. put filename.tar.gz local: filename.tar.gz remote: filename.tar.gz 150 Opening BINARY mode data connection for 'filename.tar.gz' 100% |**************************************************| 1103 00:00 ETA 226 Transfer complete. 1103 bytes sent in 0.01 seconds (215.00 KB/s) quit 221 Goodbye. |
...or from on the command-line:
[~] edwin@k7>echo "\$ uploadtest" | ftp myownmachine ftp: connect to address ::1: Connection refused Trying 127.0.0.1... 100% |**************************************************| 1103 00:00 ETA |
There is not much information here, because ftp doesn't expect a terminal here. If you use ftp -v , there will be more output.
An example with arguments is
[~] edwin@k7>echo "\$ dailyupload `date +'%Y%m%d'`" $ dailyupload 20010827 [~] edwin@k7>echo "\$ dailyupload `date +'%Y%m%d'`" | ftp myownmachine ftp: connect to address ::1: Connection refused Trying 127.0.0.1... 100% |**************************************************| 1103 00:00 ETA |
It will upload the file daily-20010827.tar.gz.
Debugging of ftp-sessions
What can go wrong
The only problems I've encountered are
- People forgetting to add an empty line after the last macdef statement.
- People with incorrect permissions on the .netrc-file.
Debugging
- If you are running the macro via the commandline, use the -v option to see more output.
- If you run ftp with the -d option you will get all commands send to the ftpd.