 Technical Briefs
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ftp File Types
There are two basic types of files you will want to get from a remote host:
- ASCII files (text) which means they have not been saved in the file format of the application that created them.
- BINARY files (programs, non-text) which means they have been saved in the file format of the application that created them. Also, many of these are saved as archived and/or compressed files.
You can usually tell the type of file you are transferring by the name of the file extension. The file extension is the last three letters of a filename after the period. Often, ASCII files will have no extension at all. Use the following chart as a guide:
File Extensions [Kind] and Their Transfer Mode
- .ARC [Archive/Compression]
- BINARY
- none [Text documents]
- ASCII
- .doc [Text document]
- ASCII
- .gif [Graphical Interchange Format]
- BINARY
- .Hqx [BinHex - Archive]
- ASCII
- .pit [PackIt - Archive/Compression]
- BINARY
- .sea [Self-extracting Archives]
- BINARY
- .sit [StuffIt - Archive/Compression]
- BINARY
- .tar [Tape Archive - Archive/Compression]
- BINARY
- .txt [Text document]
- ASCII
- .z [compress]
- BINARY
- .ZIP [PKZIP - Archive/Compression]
- BINARY
To transfer in BINARY mode, you must use ftp to tell the host you want BINARY mode. Syntax is:
-
ftp> binary
the host will respond with
-
ftp> 200 Type set to I
To return to ASCII mode, the syntax is:
-
ftp> ascii
-
ftp> 200 Type set to A
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