asp.net reading barcode SysV Init: init.d Scripts in Software

Printing QR Code in Software SysV Init: init.d Scripts

SysV Init: init.d Scripts
Decode QR-Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Encoding QR Code JIS X 0510 In None
Using Barcode generation for Software Control to generate, create Quick Response Code image in Software applications.
The startup and shutdown of server daemons is managed using special startup scripts located in the /etc/rc.d/init.d directory. These scripts often have the same name as the server's program. For example, for the /usr/sbin/httpd Web server program, a corresponding script is called /etc/rc.d/init.d/httpd. This script actually starts and stops the Web server. This method of using init.d startup scripts to start servers is called SysV Init, after the method used in UNIX System V. Note If you change the configuration of a server, you may need to start and stop it several times as you refine the configuration. Several servers provide special management tools that enable you to perform this task easily. The apachectl utility enables you to start and stop the Apache Web server easily. It is functionally equivalent to using the /tec/rc.d/init.d/httpd script to start and stop the server. For the domain name server, the ndc utility enables you to start and stop the named server. It is, however, advisable not to mix the use of init.d scripts and the management tools. The startup scripts in the /etc/rc.d/init.d directory can be executed automatically whenever you boot your system. Be careful when accessing these scripts, however. These start essential programs, such as your network interface and your printer daemon. These init scripts are accessed from links in subdirectories set up for each possible runlevel. In the /etc/rc.d directory is a set of subdirectories whose names have the format rcN.d, where N is a number referring to a runlevel. The rc script detects the runlevel in which the system was started, and
Denso QR Bar Code Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
QR Code JIS X 0510 Encoder In C#
Using Barcode creator for .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
then executes only the startup scripts specified in the subdirectory for that runlevel. The two runlevels most commonly used are 3, the multiuser level, and 5, the graphical login. When you start your system, the rc script executes the startup scripts specified in the rc3.d directory, if you are performing a command line login, and rc5.d if you are using a graphical login. The rc3.d and rc5.d directories hold symbolic links to certain startup scripts in the /etc/rc.d/init.d directory. So, the httpd script in the /etc/rc.d/init.d directory is actually called through a symbolic link in the rc3.d or the rc5.d directory. The symbolic link for the /etc/rc.d/httpd script in the rc3.d directory is S85httpd. The S prefixing the link stands for "startup" and calls the corresponding init.d script with the start option. The number indicates the order in which startup scripts are run, lower ones first. S85httpd invokes /etc/rc.d/init.d/httpd with the option start. The numbers in these links are simply there for ordering purposes. If you change the name of the link to start with a K, then the script is invoked with the stop option, stopping it. Such links are used in the runlevels 0 and 6 directories, rc6.d and rc0.d. Runlevel 0 halts the system and runlevel 6 reboots it. You can use the runlevel command to find out what runlevel you are currently operating at (see 28 for more details on runlevels). A listing of runlevels is shown here: Runlevel 0 1 2 3 5 6 rc.d Directory rc0.d rc1.d rc2.d rc3.d rc5.d rc6.d Description Halt (shut down) the system Single-user mode (no networking, limited capabilities) Multiuser mode with no NFS support (limited capabilities) Multiuser mode (full operational mode) Multiuser mode with graphical login (full operation mode with graphical login added) Reboot system
Making QR Code 2d Barcode In .NET
Using Barcode encoder for ASP.NET Control to generate, create QR image in ASP.NET applications.
Painting QR Code 2d Barcode In VS .NET
Using Barcode generation for Visual Studio .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
Most server software using RPM Red Hat packages will automatically install the startup scripts and create the needed links in the appropriate rcN.d directories. Startup scripts, though, can be used for any program you may want run when your system starts up. To have such a program start automatically, you first create a startup script for it in the /etc/rc.d/init.d directory, and then create symbolic links to that script in the /etc/rc.d/rc3.d and /etc/rc.d/rc5.d directories. A shutdown link (K) should also be placed in the rc6.d directory used for runlevel 6 (reboot). A simplified version of the startup script httpd used on Red Hat systems is shown here. You can see the different options listed under the case statement: start, stop, status, restart, and reload. If no option is provided (*), then the script use syntax is displayed. The httpd script first executes a script to define functions used in these startup scripts. The daemon function with httpd actually executes the /usr/sbin/httpd server program.
Encoding QR In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
Draw Barcode In None
Using Barcode generator for Software Control to generate, create barcode image in Software applications.
Draw Bar Code In None
Using Barcode generator for Software Control to generate, create barcode image in Software applications.
Code 128 Code Set B Generation In None
Using Barcode generation for Software Control to generate, create Code 128A image in Software applications.
Code 3/9 Generator In None
Using Barcode generator for Software Control to generate, create Code39 image in Software applications.
ECC200 Printer In None
Using Barcode creation for Software Control to generate, create DataMatrix image in Software applications.
Generating RoyalMail4SCC In None
Using Barcode generator for Software Control to generate, create Royal Mail Barcode image in Software applications.
Matrix 2D Barcode Printer In VB.NET
Using Barcode maker for .NET framework Control to generate, create 2D Barcode image in .NET framework applications.
Recognizing Code-128 In C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in VS .NET applications.
EAN13 Drawer In Java
Using Barcode drawer for Java Control to generate, create EAN13 image in Java applications.
Barcode Drawer In .NET
Using Barcode generator for Visual Studio .NET Control to generate, create barcode image in .NET framework applications.
Barcode Maker In C#
Using Barcode creation for .NET framework Control to generate, create bar code image in .NET framework applications.
Barcode Encoder In .NET
Using Barcode printer for Reporting Service Control to generate, create barcode image in Reporting Service applications.
Scan Code 39 In VB.NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in VS .NET applications.
Copyright © OnBarcode.com . All rights reserved.