![]() ![]() ![]() This can be useful to turn off tab expansion when cutting and pasting. nĭo not use Readline for line editing and do not use the command history. Write all query output into file filename, in addition to the normal output destination. This is similar to the meta-command \list. Other non-connection options are ignored. This is equivalent to \pset format html or the \H command. If the value begins with a slash, it is used as the directory for the Unix-domain socket. Specifies the host name of the machine on which the server is running. This is equivalent to \pset fieldsep or \f. Use separator as the field separator for unaligned output. On the other hand, the variant using the shell's input redirection is (in theory) guaranteed to yield exactly the same output you would have received had you entered everything by hand. There is also a slight chance that using this option will reduce the start-up overhead. In general, both will do what you expect, but using -f enables some nice features such as error messages with line numbers. Using this option is subtly different from writing psql < filename. ![]() Note however that Readline is not used in this case (much as if -n had been specified). If filename is - (hyphen), then standard input is read until an EOF indication or \q meta-command. This is in many ways equivalent to the meta-command \i. After the file is processed, psql terminates. Use the file filename as the source of commands instead of reading commands interactively. This is equivalent to setting the variable ECHO_HIDDEN to on. You can use this to study psql's internal operations. EĮcho the actual queries generated by \d and other backslash commands. This is equivalent to setting the variable ECHO to queries. eĬopy all SQL commands sent to the server to standard output as well. If so, connection string parameters will override any conflicting command line options. This is equivalent to specifying dbname as the first non-option argument on the command line. Specifies the name of the database to connect to. It's better to feed multiple commands to psql's standard input, either using echo as illustrated above, or via a shell here-document, for example: psql <<EOF Also, only the result of the last SQL command is returned.īecause of these legacy behaviors, putting more than one command in the -c string often has unexpected results. This is different from the behavior when the same string is fed to psql's standard input. If the command string contains multiple SQL commands, they are processed in a single transaction, unless there are explicit BEGIN/ COMMIT commands included in the string to divide it into multiple transactions. To achieve that, you could pipe the string into psql, for example: echo '\x \\ SELECT * FROM foo ' | psql. Thus you cannot mix SQL and psql meta-commands with this option. Start-up files ( psqlrc and ~/.psqlrc) are ignored with this option.Ĭommand must be either a command string that is completely parsable by the server (i.e., it contains no psql-specific features), or a single backslash command. Specifies that psql is to execute one command string, command, and then exit. This is equivalent to setting the variable ECHO to errors. Print failed SQL commands to standard error output. (The default output mode is otherwise aligned.) -b (This does not apply to lines read interactively.) This is equivalent to setting the variable ECHO to all. It is not enough if it just visually coincides with the correct answer.Print all nonempty input lines to standard output as they are read. Try to prove that your construction satisfies the statement of the problem. Switch to the Explore mode (the orange button) and take a look how the answer depends on point configuration. But, for example, a midpoint or a tangent point can never be red. In general, you do not need to avoid them since some optimal solutions are impossible without red points. A correct construction should satisfy the statement of the problem for any configuration of points and figures.Ĭheck the red points. Select the Hand tool and try to drag different points. For example, you could forget to set a point in one of the ends of a line segment. Make sure that the required object is really constructed. You can also review definitions in our glossary by tapping "?" under the statement. To review it tap a preview card in the top left corner of the game screen. Read carefully the statement of the problem. Most probably your solution is not accepted because it is just an approximation. The app just verifies that the target object is present on the screen. There are no built-in solutions in Euclidea. ![]()
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