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USaddaon
 

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    1. PO
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      1. PTAnswer
    2. POInstruction to register an application incorrect
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      1. PTQuestion
    1. PO
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    2. POIs wchar_t guaranteed to be distinct from any integer type?
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    3. PO
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      1. PODetecting display type in Android
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      1. VTBountyStart
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      1. PORender-to-texture and synchronization
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      1. POGoogle+ Button: Login for .clearScopes() is working and setScope() is not
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      1. VTFavorite
    1. COThis program isn't really doing any parsing at all... instead, it's just calling the given program with the first argument provided, under the further constraint that the program live in the `/usr` directory.
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    2. COIt's up to the shell, which is the (interactive, in this case) program that reads the input and passes it on to other programs (after doing its own validation). In the example you give, no, it's rather more complex than that. Most shells will pass `program` the `-e` option, then past `blah` the (separate) options `blah`, `blah`, and `123`, and also configure the I/O of the programs such that the standard output of `program` is connected to the standard input of `blah` (the meaning of the pipe character in common shells).
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      1. POAlgorithm to read and write command line string
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    3. COI suspect you'll find you have a bit of learning to do before you're able to rephrase this question in a way where we'll really be able to help. Things to keep in mind: each program can parse its command line arguments however it wants, and there really aren't standards. And multiple programs can interact on the command line, in a way defined by the current shell. Things to think about: All of `program "/path/to file"`, `program /path/to\ file`, and `program /path/to file` are legal. Also: how do you validate `echo -e "1\n2\n3\n4\n5" | perl -lne 'print if (1x$_) !~ /^1?$|^(11+?)\1+$/'`?
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      1. POAlgorithm to read and write command line string
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