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The ftp program provides a basic set of commands for managing files and directories on your remote site, provided you have the permission to do so (see Table 19-5). You can use mkdir to create a remote directory, and rmdir to remove one. Use the delete command to erase a remote file. With the rename command, you can change the names of files. You close your connection to a system with the close command. You can then open another connection if you want. To end the ftp session, use the quit or bye command. Table 19-5: ftp Client Commands Effect Invokes ftp program Opens a connection to another system Closes connection to a system Ends ftp session Lists the contents of a directory Lists the contents of a directory in long form Sends file from remote system to local system
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Table 19-5: ftp Client Commands Effect Sends file from local system to remote system Enables you to download several files at once from a remote system; you can use special characters to specify the files; you are prompted one by one, in turn, for each file transfer Enables you to send several files at once to a remote system; you can use special characters to specify the files; you are prompted one by one for each file to be transferred Toggles storing of files with unique filenames. If a file already exists with the same filename on the local system, a new filename is generated Resumes transfer of an interrupted file from where you left off Transfers files in binary mode Transfers files in ASCII mode Changes directories on the remote system Changes directories on the local system Lists ftp commands Creates a directory on the remote system Deletes a remote directory Deletes a file on the remote system Deletes several remote files at once Renames a file on a remote system Displays progressive hash signs during download Displays current status of ftp
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To transfer files to and from the remote system, use the get and put commands. The get command receives files from the remote system to your local system, and the put command sends files from your local system to the remote system. In a sense, your local system gets files from the remote and puts files to the remote. In the next example, the file weather is sent from the local system to the remote system using the put command:
ftp> put weather PORT command successful. ASCII data connection ASCII Transfer complete. ftp>
If a download is ever interrupted, you can resume the download with reget. This is helpful for an extremely large file. The download resumes from where it left off, so the whole file needn't be downloaded again. Also, be sure to download binary files in binary mode. For most FTP sites, the binary mode is the default, but some sites might have ASCII (text) as the default. The command ascii sets the character mode, and the command binary sets the binary mode. Most software packages available at Internet sites are archived and compressed files, which are binary files. In the next example, the transfer mode is set to binary, and the archived software package mydata.tar.gz is sent from the remote system to your local system using the get command:
ftp> binary ftp> get mydata.tar.gz PORT command successful. Binary data connection Binary Transfer complete. ftp>
You may often want to send several files, specifying their names with wildcard characters. The put and get commands, however, operate only on a single file and do not work with special characters. To transfer several files at a time, you have to use two other commands, mput and mget. When you use mput or mget, you are prompted for a file list. You can then either enter the list of files or a file-list specification using special characters. For example, *.c specifies all the files with a .c extension, and * specifies all files in the current directory. In the case of mget, each file is sent, one by one, from the remote system to your local system. Each time, you are prompted with the name of the file being sent. You can type y to send the file or n to cancel the transmission. You are then prompted for the next file. The mput command works in the same way, but it sends files from your local system to the remote system. In the next example, all files with a .c extension are sent to your local system using mget:
ftp> mget (remote-files) *.c mget calc.c y PORT command successful ASCII data connection ASCII transfer complete mget main.c y PORT command successful ASCII data connection ASCII transfer complete ftp>
Answering the prompt for each file can be a tedious prospect if you plan to download a large number of files, such as those for a system update. In this case, you can turn off the prompt with the prompt command, which toggles the interactive mode on and off. The mget operation then downloads all files it matches, one after the other.
ftp> prompt Interactive mode off. ftp> mget (remote-files) *.c PORT command successful ASCII data connection ASCII transfer complete PORT command successful
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