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Tcl Input and Output: gets and puts
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Tcl can read input from the standard input or a file using the gets command and write output to the standard output with the puts command. The following command reads a line from the standard input, usually the keyboard. The input is placed in the variable line.
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gets line
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The puts command outputs a string to the standard output or to a file. It takes as its argument the string to be output.
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puts $line.
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gets reads a line into the variable specified as its argument. You can then use this variable to manipulate whatever has been read. For example, you can use line in a puts command to display what was input.
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myread #!/usr/bin/tclsh gets line puts "This is what I entered: $line" $ myread larisa and aleina This is what I entered: larisa and aleina
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You can use the puts command to write data to any file or to the standard output. File handle names are placed after the puts command and before any data such as strings or variables. If no filename is specified, then puts outputs to the standard output. To output formatted values, you can use the results of a format command as the argument of a puts command. format performs a string conversion operation on a set of values, formatting them according to conversion specifiers in a format string.
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puts [format "%s" $myname]
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If you want to output different kinds of values in a puts operation, you can use the format command to first transform them into a single string. The puts command will only output a single string. In the following example, the contents of the $firstname and $age variables are output as a single string by first using the format command with two string specifiers, "%s %d", to make them one string. %d will transform a numeric value into its corresponding character values.
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puts [format "%s %d" $firstname $age]
For string values, you can just make them part of the single string by placing them within double quotes. In this example, firstname and lastname are made part of the same string:
puts "$firstname $lastname"
Tcl File Handles
You use the open command to create a file handle for a file or pipe (see Table 7 for a list of Tcl file commands). The open command takes two arguments, the filename and the file mode, and returns a file handle that can then be used to access the file. The filename argument can be the name of the file or a variable that holds the name of the file. The file mode is the permissions you are opening the file with. This can be r for read-only, w for write-only, and a for append only. To obtain both read and write permission for overwriting and updating a file, you attach a + to the file mode. r+ gives you read and write permission. The syntax for open follows:
open ( filename-string, file-mode );
Table 7: Tcl: File Access and Input/Output Commands File Access Commands Description file open close eof fcopy flush glob read seek tell socket Input/Output Commands format scan gets puts Format a string with conversion specifiers, like sprintf in C Read and convert elements in a string using conversion specifiers, like scanf in C Read a line of input Write a string to output Obtain file information Open a file Close a file Check for end of file Copy from one file to another Flush output from a file's internal buffers Match filenames using glob pattern characters Read blocks of characters from a file Set the seek offset of a file Return the current offset of a file Open a TCP/IP network connection
You would usually use the open command in a set command so that you can assign the file handle returned by open to a variable. You can then use that file handle in that variable in other file commands to access the file. In the next example, the user opens the file reports with a file mode for reading, r, and assigns the returned file handle to the myfile variable.
set myfile [open "reports" r]
Often, the filename will be held in a variable. You then use the $ with the variable name to reference the filename. In this example, the filename reports is held in the variable filen:
set myfile [open $filen r]
Once you have finished with the file, you close it with the close command. close takes as its argument the file handle of the file you want to close.
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