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Throughout this book, you ve used F# printf format strings to format text and output; 4 introduced the basic format specifiers for this kind of text formatting. Functions such as printf and printfn are located in the Microsoft.FSharp.Text.Printf module. Another way to format strings is to use the System.String.Format static method or the other .NET composite formatting functions such as System.Console.WriteLine and TextWriter.WriteLine. This is a distinct set of formatting functions and directives redesigned and implemented from the ground up for the .NET platform. Like printf, these methods take a format specifier and the objects to be formatted. The format specifier is a string with any number of format items acting as placeholders and designating which object is to be formatted and how. Consider the following simple example: > System.String.Format("{0} {1} {2}", 12, "a", 1.23);; val it : string = "12 a 1.23" Each format item is enclosed in braces giving the index of the object to be formatted, and each can include an optional alignment specification (always preceded by a comma after the index, giving the width of the region in which the object is to be inserted, as in {0, 10}) and a format type that guides how the given object is formatted (as in {0:C}, where C formats as a system currency). The general syntax of the format item is as follows: {index[,alignment][:formatType]} You can use the alignment value to pad the formatted object with spaces; text alignment is left if its value is negative and right if positive. Table 10-7 summarizes the most often used format types.

Currency Decimal/long date Scientific Fixed-point General Number Percent Hexadecimal Short/long date Short/long time Month Year

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It is also possible to manage permissions using the Finder s Info pane, shown in Figure 4 9. However, this interface is fairly pared down, and the POSIX/ACL system is abstracted a bit. One large limitation is that it is not possible to change the POSIX owner or group. It is possible to change the mode for owner, group, and everyone class, but outside of that, you can only manage ACLs. For ACEs, the Finder uses the Read & Write, Read Only, and Write Only presets used by Server Admin with one crucial change: they do not set any of the inheritance properties. It is possible to propagate permissions to enclosing items using the Finder (once again found under a similar widget menu), but the propagation doesn t set any inheritance properties either. This means that newly created subdirectories or files will not inherit any ACEs that you establish through this procedure. This is a fairly significant limitation. If you are attempting to manage ACEs on an OS X client machine and wish for propagation, you ll need to set the inheritance rights yourself using the command line.

PicSay is probably the best known of several photo-editing apps that allow you to make artistic and novel changes to photos before uploading them, as shown in Figure 9 13. PicSay comes in a free trial version and a paid app (about $4.00 as I write this). Google Checkout will convert the currency if you buy the app through the Android Market. The trial version of PicSay has an older version of the interface than the for-pay version, and limits the size of pictures. The pro version also offers more editing options.

You can find more information about .NET composite formatting at www.expert-fsharp.com/Topics/ TextFormatting.

You may often find yourself managing permissions from the command line. There are a few primary command line apps that you will use to do this: chown, chgrp and chmod. To change POSIX ownership of a file or folder, you use the chown utility. Its syntax is fairly straightforward:

It s often necessary to convert string data between different formats. For example, files read using the ReadLine method on the System.IO.StreamReader type are read with respect to a Unicode encoding. You can specify this when creating the StreamReader; if left unspecified, the .NET libraries attempt to determine the encoding for you. One common requirement is to convert strings to and from ASCII representations, assuming that all the characters in the strings are in the ASCII range 0 to 127. You can do this using System.Text.Encoding.ASCII.GetString and System.Text.Encoding.ASCII.GetBytes. Table 10-8 shows the predefined encodings and commonly used members in the System.Text.Encoding type. Table 10-8. Types and Members Related to Unicode Encodings

If all you re doing is changing ownership, you can omit the :group [the colon followed by the actual value for group]. Alternatively, you can use the chgrp command, which has similar syntax, but you instead provide the desired group name in the place of a user. OS X won t let just anyone change the owner of a file. To change ownership, you must either have granted the chown ACL right, or you must be running as root. However, even if you have been granted the chown ACL right, you will only be able to assume ownership of a file yourself. Only the root user can change the owner to a user other than itself. For example, the following command changes the owner of file /tmp/myfile.txt to hunterbj :

System.Text.Encoding UTF8 : Encoding ASCII : Encoding Unicode : Encoding UTF32 : Encoding GetEncoding : string -> Encoding member GetBytes : string -> byte[] member GetChars: byte[] -> char[] member GetString : byte[] -> string

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