asp net read barcode from image $ winner=dylan $ notice="The person who won is $winner" $ echo $notice The person who won is dylan in Software

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$ winner=dylan $ notice="The person who won is $winner" $ echo $notice The person who won is dylan
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You can always quote any special character, including the $ operator, by preceding it with a backslash. The backslash is useful when you want to evaluate variables within a string and also include $ characters. In the next example, the backslash is placed before the dollar sign in order to treat it as a dollar sign character, \$. At the same time, the variable $winner is evaluated, since double quotes do not themselves quote the $ operator.
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$ winner=dylan $ result="$winner won \$100.00"" $ echo $result dylan won $100.00
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Values from Linux Commands: Back Quotes
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Though you can create variable values by typing in characters or character strings, you can also obtain values from other Linux commands. However, to assign the result of a Linux command to a variable, you first need to execute the command. If you place a Linux command within back quotes on the command line, that command is executed first and its result becomes an argument on the command line. In the case of assignments, the result of a command can be assigned to a variable by placing the command within back quotes to execute it first. Tip Think of back quotes as a kind of expression that contains both a command to be executed and its result, which is then assigned to the variable. The characters making up the command itself are not assigned.
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In the next example, the command ls *.c is executed and its result is then assigned to the variable listc. The command ls *.c generates a list of all files with a .c extension, and this list of files will then be assigned to the listc variable.
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$ listc=`ls *.c` $ echo $listc main.c prog.c lib.c
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Within a script, you can use the echo command to output data and the read command to read input into variables. Also within a script, the echo command will send data to the standard output. The data is in the form of a string of characters. As you have seen, the echo command can output variable values as well as string constants. The read command reads in a value for a variable. It is used to allow a user to interactively input a value for a variable. The read command literally reads the next line in the standard input. Everything in the standard input up to the newline character is read in and assigned to a variable. In shell programs, you can combine the echo command with the read command to prompt the user to enter a value and then read that value into a variable. In the greetvar script in the next example, the user is prompted to enter a value for the greeting variable. The read command then reads the value the user typed and assigns it to the greeting variable. greetvar
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echo Please enter a greeting: read greeting echo "The greeting you entered was $greeting"
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The greetvar script is then run, as shown here:
$ greetvar Please enter a greeting: hi The greeting you entered was hi $
If the value of a variable is a special character and the variable's value is referenced with a $, then the special character will be evaluated by the shell. However, placing the evaluated variable within quotes prevents any evaluation of special characters such as $. In the greetvar script, $greeting was placed within a quoted string, preventing evaluation of any special characters. If $greeting is not quoted, then any special characters it contains will be evaluated. The Here operation is a redirection operation, redirecting data within a shell script into a command. It is called Here because the redirected data is here in the shell script, not somewhere else in another file. The Here operation is represented by two less-than signs, <<. The << operator can be thought of as a kind of redirection operator, redirecting lines in a shell script as input to a command. The << operator is placed after the command to which input is being redirected. Lines following the << operator are then taken as input to the command. The end of the input can be specified by an end-of-file character, CTRL-D. Instead of using an
end-of- file character, you can specify your own delimiter. A word following the << operator on the same line is taken to be the ending delimiter for the input lines. The delimiter can be any set of symbols. All lines up to the delimiter are read as input to the command. In the next example, a message is sent to the user mark. The input for the message is obtained from a Here operation. The delimiter for the Here operation is the word myend. mailmark
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