cal - Linux command to display calendar

cal command

cal is a Linux command run on Terminal, to display built-in calendar on Terminal in text mode.

GtkColorChooser example

GtkColorChooser

#include <gtk/gtk.h>

static void 
chooser_color_activated(GtkColorChooser *chooser, 
 GdkRGBA *color, gpointer user_data)
{
 GtkLabel *label = user_data;
 gtk_label_set_text (label, gdk_rgba_to_string(color));
}

int main( int argc, char *argv[])
{
    GtkWidget *window;
    GtkWidget *box;
    GtkWidget *label;
    GtkWidget *chooser;

    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), 400, 250);
    gtk_window_set_title(GTK_WINDOW(window), "Linux-buddy.blogspot.com");

    box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);

 label = gtk_label_new("label");
    gtk_box_pack_start(GTK_BOX(box), label, FALSE, FALSE, 3);

 //Create GtkColorChooser
    chooser = gtk_color_chooser_widget_new();
    gtk_box_pack_start(GTK_BOX(box), chooser, FALSE, FALSE, 3);
    g_signal_connect (GTK_COLOR_CHOOSER(chooser),
                    "color-activated", 
                    G_CALLBACK (chooser_color_activated), 
                    label);

    g_signal_connect(G_OBJECT(window), "destroy", 
        G_CALLBACK(gtk_main_quit), NULL);

    gtk_container_add(GTK_CONTAINER(window), box);
    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}

Note: double click the color buttons to activate color change.

View hiden file start with a "."

Filenames which start with a "." (dot) are normally not shown. Use 'ls .*' or 'ls -a ...' to see them.

GTK+ example: Scale

GTK+ example: Scale

#include <gtk/gtk.h>

static gboolean
scale_changed (GtkRange *range, gpointer data)
{
    gchar *text;
    gdouble value;
    GtkLabel *label;

    label = data;
    value = gtk_range_get_value (range);
    text = g_strdup_printf ("%.1f", value);
    gtk_label_set_text (label, text);
    g_free (text);

    return TRUE;
}

int main( int argc, char *argv[])
{
    GtkWidget *window;
    GtkWidget *box;
    GtkWidget *label;
    GtkWidget *spinButton;
    GtkWidget *scale;

    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), 400, 250);
    gtk_window_set_title(GTK_WINDOW(window), "Linux-buddy.blogspot.com");

    box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);

    //Create Label
    label = gtk_label_new("label");
    gtk_box_pack_start(GTK_BOX(box), label, FALSE, FALSE, 3);

    //Create Scale
    scale = gtk_scale_new_with_range (
        GTK_ORIENTATION_HORIZONTAL, 
        0,      //gdouble min
        10,     //gdouble max
        0.5);     //gdouble step
    gtk_widget_set_hexpand (scale, TRUE);
    g_signal_connect(G_OBJECT(scale), "value-changed", 
        G_CALLBACK(scale_changed), label);

    gtk_box_pack_start(GTK_BOX(box), scale, FALSE, FALSE, 3);

    //Connects GCallback function gtk_main_quit to "destroy" signal for "window"
    g_signal_connect(G_OBJECT(window), "destroy", 
        G_CALLBACK(gtk_main_quit), NULL);

    gtk_container_add(GTK_CONTAINER(window), box);
    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}

GTK+ example: SpinButton

SpinButton displayed on Ubuntu

#include <gtk/gtk.h>

static gboolean
spinButton_changed (GtkSpinButton *spin, gpointer data)
{
    gchar *text;
    int value;
    GtkLabel *label;

    label = data;
    value = gtk_spin_button_get_value_as_int (spin);
    text = g_strdup_printf ("%02d", value);
    gtk_label_set_text (label, text);
    g_free (text);

    return TRUE;
}

int main( int argc, char *argv[])
{
    GtkWidget *window;
    GtkWidget *box;
    GtkWidget *label;
    GtkWidget *spinButton;

    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), 400, 250);
    gtk_window_set_title(GTK_WINDOW(window), "Linux-buddy.blogspot.com");

    box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);

    //Create Label
    label = gtk_label_new("label");
    gtk_box_pack_start(GTK_BOX(box), label, FALSE, FALSE, 3);

    //Create SpinButton
    spinButton = gtk_spin_button_new_with_range  (
        0,      //gdouble min
        10,     //gdouble max
        2);     //gdouble step
    gtk_widget_set_hexpand (spinButton, TRUE);
    g_signal_connect(G_OBJECT(spinButton), "value-changed", 
        G_CALLBACK(spinButton_changed), label);

    gtk_box_pack_start(GTK_BOX(box), spinButton, FALSE, FALSE, 3);

    //Connects GCallback function gtk_main_quit to "destroy" signal for "window"
    g_signal_connect(G_OBJECT(window), "destroy", 
        G_CALLBACK(gtk_main_quit), NULL);

    gtk_container_add(GTK_CONTAINER(window), box);
    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}

Remark: wrong icon displayed on Lubuntu:

SpinButton with wrong icon displayed on Lubuntu

Download file using SSH with scp command

The Linux command scp, securely copying files, uses ssh for data transfer, to copy file to, from, or between different hosts.

To download file from server using ssh, using the command:

$ scp user@hostname:file local-directory

example:
$ scp pi@192.168.111.109:~/log1 ~/PiLog
where pi is user name in server with IP 192.168.111.109, copy ~/log1 from server to local directory ~/PiLog.

scp

Redirect command output to both stdout and file

The linux command tee read from standard input and write to standard output and files.

Example:
$ ls | tee filelist.txt