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The variable is expanded, and the shortest string that matches PATTERN is removed from the end of the expanded value. The PATTERN here and in other parameter expansions is a filename expansion (aka file globbing) pattern. Given the string Toronto and the pattern o*, the shortest matching pattern is the final o: $ var=Toronto $ var=${var%o*} $ printf "%s\n" "$var" Toront Because the truncated string has been assigned to var, the shortest string that now matches the pattern is ont: $ printf "%s\n" "${var%o*}" Tor This expansion can be used to replace the external command, dirname, which strips the filename portion of a path, leaving the path to the directory (Listing 5-3). If there is no slash in the string, the current directory is printed if it is the name of an existing file in the current directory; otherwise, a dot is printed. Listing 5-3. dname, Print the Directory Portion of a File Path case $1 in */*) printf "%s\n" "${1%/*}" ;; *) [ -e "$1" ] && printf "%s\n" "$PWD" || echo '.' ;; esac

The final point of interest regarding .NET metadata is the fact that each and every string literal in your code base is documented under the User Strings token. User Strings ------------------------------------------------------70000001 : (11) L"Jamming {0}" 70000019 : (13) L"Quiet time..." 70000035 : (23) L"CarLibrary Version 2.0!" 70000065 : (14) L"Ramming speed!" 70000083 : (19) L"Faster is better..." 700000ab : (16) L"Time to call AAA" 700000cd : (16) L"Your car is dead"

Table A-27. comment (comment module)

Note As illustrated in this last metadata listing, always be aware that all strings are clearly documented in the assembly metadata. This could have huge security consequences if you were to use string literals to capture passwords, credit card numbers, or other sensitive information.

The next question on your mind may be (in the best-case scenario) How can I leverage this information in my applications or (in the worst-case scenario) Why should I care about metadata To address both points of view, allow me to introduce .NET reflection services. Be aware that the usefulness of the topics presented over the pages that follow may be a bit of a head-scratcher until this chapter s endgame. So hang tight.

Note You will also find a number of CustomAttribute tokens displayed by the MetaInfo window, which documents the attributes applied within the code base. You ll learn about the role of .NET attributes later in this chapter.

The {comments}.cid to which this comment is a reply; if set to 0, this comment is not a reply to an existing comment. The {node}.nid to which this comment is a reply The {users}.uid who authored the comment; if set to 0, this comment was created by an anonymous user. The comment title The author s hostname The time, as a Unix timestamp, that the comment was created The time, as a Unix timestamp, when the comment was updated The published status of a comment (0 means published, and 1, not published) The vancode representation of the comment s place in a thread The comment author s name; uses {users}.name if the user is logged in; otherwise, uses the value typed into the comment form The comment author s e-mail address from the comment form if user is anonymous and the Anonymous users may/must leave their contact information setting is turned on

It should come as no surprise that .NET assemblies can be executed only on a machine that has the .NET Framework installed. For an individual who builds .NET software, this should never be an issue, as your development machine will be properly configured at the time you install the freely available .NET Framework 4.0 SDK (as well as commercial .NET development environments such as Visual Studio 2010).

However, if you deploy your application to a computer that does not have .NET installed, it will fail to run. For this reason, Microsoft provides a setup package named dotNetFx40_Full_x86.exe that can be freely shipped and installed along with your custom software. This installation program can be downloaded from Microsoft s general download area (http://www.microsoft.com/downloads). Once dotNetFx40_Full_x86.exe is installed, the target machine will now contain the .NET base class libraries, .NET runtime (mscoree.dll), and additional .NET infrastructure (such as the GAC).

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infrastructure. However, if you are deploying your application to a different Microsoft OS, such as Windows XP, you will want to ensure the target machine has the .NET runtime environment installed and configured.