Tutorial by Examples: l

AWK often used for manipulating entire files containing a list of strings. Let's say file awk_test_file.txt contains: First String Second String Third String To convert all the strings to lower case execute: awk '{ print tolower($0) }' awk_test_file.txt This will result: first string se...

Using The Terminal The examples in this document assume that you are using a POSIX-compliant (such as bash, sh, zsh, ksh) shell. Large portions of GNU/Linux functionality are achieved using the terminal. Most distributions of Linux include terminal emulators that allow users to interact with a...

ShortcutDescriptionCtrl + rsearch the history backwardsCtrl + pprevious command in historyCtrl + nnext command in historyCtrl + gquit history searching modeAlt + .use the last word of the previous commandrepeat to get the last word of the previous + 1 commandAlt + n Alt + .use the nth word of the pr...

ShortcutDescriptionCtrl + cStop the current jobCtrl + zSuspend the current job (send a SIGTSTP signal)

Converter between boolean and visibility. Get bool value on input and returns Visibility value. NOTE: This converter have already exists in System.Windows.Controls namespace. public sealed class BooleanToVisibilityConverter : IValueConverter { /// <summary> /// Convert bool or Nu...

Show how to create simple converter with parameter via property and then pass it in declaration. Convert bool value to Visibility. Allow invert result value by setting Inverted property to True. public class BooleanToVisibilityConverter : IValueConverter { public bool Inverted { get; set; } ...

Show how to create simple IMultiValueConverter converter and use MultiBinding in xaml. Get summ of all values passed by values array. public class AddConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { ...

There are a few ways to determine the current shell echo $0 ps -p $$ echo $SHELL

To change the current bash run these commands export SHELL=/bin/bash exec /bin/bash to change the bash that opens on startup edit .profile and add those lines

package { import flash.events.TimerEvent; import flash.events.TimerEvent; import flash.utils.Timer; public class RandomTimer extends Timer { public var minimumDelay:Number; public var maximumDelay:Number; private var _count:uint = 0; privat...

The hooks feature can be globally enabled/disabled by setting the following item in the application/config/config.php file: $config['enable_hooks'] = TRUE;

If you use the paste command from your terminal emulator program, Vim will interpret the stream of characters as if they were typed. That will cause all kind of undesirable effects, particularly bad indendation. To fix that, from command mode: :set paste Then move on to insert mode, with i, for...

$ IFS= read -r foo <<EOF > this is a \n line >EOF $ printf '%s\n' "$foo" this is a \n line

$ read -r foo <<EOF > this is a line >EOF $ printf '%s\n' "$foo" this is a line

Even if third-party libraries are good, a simple way to parse the JSON is provided by protocols You can imagine you have got an object Todo as struct Todo { let comment: String } Whenever you receive the JSON, you can handle the plain NSData as shown in the other example using NSJSONSeria...

Instead of using the delegate pattern, that split the implementation in various part of the UIViewController class, you can even use closures to pass data back and forward. By assuming that you're using the UIStoryboardSegue, in the prepareForSegue method you can easily setup the new controller in ...

Check existing partitions on Schema SELECT * FROM user_tab_partitions;

This creates a table partitioned by lists, in this example on store id. CREATE TABLE orders ( order_nr NUMBER(15), user_id VARCHAR2(2), order_value NUMBER(15), store_id NUMBER(5) ) PARTITION BY LIST(store_id) ( PARTITION p1 VALUES (1,2,3), PARTITION p2 VALUES(4,5,6...

Select data from a partition SELECT * FROM orders PARTITION(partition_name);

ALTER TABLE table_name MOVE PARTITION partition_name TABLESPACE tablespace_name;