Editing Data Type
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But most of the time, however, only ASCII and binary types are used or even implemented. | But most of the time, however, only ASCII and binary types are used or even implemented. | ||
− | ASCII type is used to transfer text files. The problem with text files is that different platforms have different kinds of line endings. Microsoft Windows for example uses a CR+LF pair (carriage return and line feed), while Unix(-like) systems, including Linux and MacOS X, only | + | ASCII type is used to transfer text files. The problem with text files is that different platforms have different kinds of line endings. Microsoft Windows for example uses a CR+LF pair (carriage return and line feed), while Unix(-like) systems, including Linux and MacOS X, only uses LF and traditional MacOS systems (MacOS 9 or older) only uses CR. The purpose of ASCII type is to ensure that line endings are properly changed to what is right on the platform. According to the FTP specification, ASCII files are always transferred using a CR+LF pair as line ending. |
So in case the file is transferred from the client to the server, the client has to make sure CR+LF is used. Therefore it has to add nothing (on Microsoft Windows), add CR (on Unix) or add LF (on legacy MacOS) to each line ending. The server then adjusts the line ending again to what is used on the platform the server runs at. If it is Microsoft Windows, nothing has to be removed, while on Unix the superfluous CR is removed and on legacy MacOS the unneeded LF. | So in case the file is transferred from the client to the server, the client has to make sure CR+LF is used. Therefore it has to add nothing (on Microsoft Windows), add CR (on Unix) or add LF (on legacy MacOS) to each line ending. The server then adjusts the line ending again to what is used on the platform the server runs at. If it is Microsoft Windows, nothing has to be removed, while on Unix the superfluous CR is removed and on legacy MacOS the unneeded LF. | ||
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So when you are not sure what to use, always go for binary type. Nowadays, nearly all (good) text editors can handle the three possible line endings, and other textual files like the ones of scripting languages such as Perl or PHP, as well as XML files (nearly) always work with any line ending as well. | So when you are not sure what to use, always go for binary type. Nowadays, nearly all (good) text editors can handle the three possible line endings, and other textual files like the ones of scripting languages such as Perl or PHP, as well as XML files (nearly) always work with any line ending as well. | ||
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