The osascript command can be used to run Apple commands or scripts. A common situation for MacAdmins is the following osascript: osascript -e 'display dialog "Hello, World"' Sometimes it is necessary to have a set of quotes within quotes. But the easiest is to move the special character out of the quotes: dirpath=~"/Library/Application Support" You could use the $HOME variable instead (but be sure you are in a context where this is set). You could escape the space with a backslash. There are a few ways to solve this problem. But when you put the ~ in the quotes, it will not be substituted to the user’s home directory path. For example, when you want to refer to the path ~/Library/Application Support, you should put it in quotes, because of the space. Things can start getting complicated when you want special characters with their special functionality. Combining literal strings with special characters Whether you should use double quotes or single quotes depends on the use case. In general, it is a good rule to always quote literal strings. The parenthesis syntax is more readable and can be nested. Though you should be using the $(…) syntax for command substitution instead of backticks `. > echo "The Computer Name is `scutil -get ComputerName`" This allows us to use old-style command substitution with backticks and variable substitution (dollar sign) within double quoted strings: > echo "Hello, $name" (There are slight differences between the shells on this.) A single quoted string of '#$"\!' will represent exactly those characters.ĭouble quotes escape most characters, except the double quote " the backtick `, the dollar sign $, the backslash \, and the exclamation mark !. Single quotes escape every special character except the single quote itself. The difference between single quotes and double quotes is important. ( More details in this post.) name='John Doe' Space is proverbial ‘killer character’, especially for file paths. When the literal string contains special characters, you need to either escape the special characters with the backslash \ or quote the entire string with either single quotes ' or double quotes ". When you use the variable, you prefix a $ symbol: > echo $name In shell scripts (sh, bash, and zsh) you use the equals character = to assign a string value to a variable: > name=JohnĪs long as there are no special characters in the literal string, there is no need to quote the string. ![]() It looks simple and straightforward enough, but there are lots of small devils in the details, that can come out and haunt you. Usually commercial software or games are produced for sale or to serve a commercial purpose.Quoting strings and variable substitutions is a bit of a dark art in shell scripts. Even though, most trial software products are only time-limited some also have feature limitations. ![]() After that trial period (usually 15 to 90 days) the user can decide whether to buy the software or not. Trial software allows the user to evaluate the software for a limited amount of time. Demos are usually not time-limited (like Trial software) but the functionality is limited. In some cases, all the functionality is disabled until the license is purchased. Demoĭemo programs have a limited functionality for free, but charge for an advanced set of features or for the removal of advertisements from the program's interfaces. In some cases, ads may be show to the users. Basically, a product is offered Free to Play (Freemium) and the user can decide if he wants to pay the money (Premium) for additional features, services, virtual or physical goods that expand the functionality of the game. This license is commonly used for video games and it allows users to download and play the game for free. There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared. Programs released under this license can be used at no cost for both personal and commercial purposes. Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use). Freeware programs can be downloaded used free of charge and without any time limitations.
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