The Linux Programmers Toolbox

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And these generally useful tools ended up in my Embedded Toolbox. But can your calculator accept complete expressions in the C-syntax , which you can cut-and-paste directly to and from your embedded code? How many buttons do you need to push to see your result in decimal, hex and binary? I begin with describing QCalc features and then I tell you how to download and launch it. QCalc is also a powerful floating-point scientific calculator and supports all mathematical functions sin , cos , tan , exp , ln , …. Some examples of acceptable expressions are:.

If the result of expression evaluation is integer as opposed to floating point , QCalc automatically displays the result in hexadecimal and binary formats see QCalc GUI. For better readability the hex display shows a comma between the two bit half-words e. Similarly, the binary output shows a comma between the four 8-bit bytes e.

Here are a few examples of such expressions:. QCalc remembers the history of up to 8 most recently entered expressions. Expressions that you enter into QCalc might have all kinds of errors: syntax errors, computation errors e. To launch QCalc, you need to open this file with the wish Tk interpreter. You use QCalc by typing or pasting an expression in the user input field and pressing the Enter key to evaluate the expression.

You can also resize the QCalc window to see more or less of the input field. The directory contains also a shortcut qcalc , which you can copy to your desktop. Most Linux distributions contain the Tk interpreter, which you can use to launch QCalc. This entry was posted on Tuesday, June 27th, at pm and is filed under productivity. You can follow any responses to this entry through the RSS 2. It is possible to keep the local share enabled, for this we need to create a new virtual device with a new IP address for the tunnel, the smb share will be connected over this address.

Furthermore the local RDP is already listening on , so we choose For this example let's use a virtual IP of It is possible to create multiple loop devices and tunnel. On Windows , only putty worked for me. On Windows Vista also forward the port in addition to the port Also on Vista the patch KB prevents the port to be forwarded, so I had to uninstall this path in Vista. With the ssh. Since ssh. Now create the loopback interface with IP Configure the IP address of the fake device to Enable Client for Microsoft Networks.

I HAD to reboot for this to work. Debug If it is not working: Are the ports forwarded: netstat -an? Look at 0. You need the checkbox "Local ports accept connections from other hosts". Connect two clients behind NAT Suppose two clients are behind a NAT gateway and client cliadmin has to connect to client cliuser the destination , both can login to the gate with ssh and are running Linux with sshd.

You don't need root access anywhere as long as the ports on gate are above We use on gate. Also since the gate is used locally, the option GatewayPorts is not necessary. On client cliwin to gate: ssh -R localhost user gate On client cliadmin from host to gate : ssh -L localhost admin gate Now the admin can connect directly to the client VNC with: vncconnect -display :0 localhost Dig a multi-hop ssh tunnel Suppose you can not reach a server directly with ssh, but only via multiple intermediate hosts for example because of routing issues.

Sometimes it is still necessary to get a direct client - server connection, for example to copy files with scp, or forward other ports like smb or vnc. One way to do this is to chain tunnels together to forward a port to the server along the hops. This "carrier" port only reaches its final destination on the last connection to the server. Suppose we want to forward the ssh port from a client to a server over two hops. Once the tunnel is build, it is possible to connect to the server directly from the client and also add an other port forward.

The connection is automatically rebuilt if closed. You can add multiple -L or -R tunnels on one line. One advantage with SSH is that there is no need to install and configure additional software.

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Additionally the tunnel uses the SSH authentication like pre shared keys. The drawback is that the encapsulation is done over TCP which might result in poor performance on a slow link.

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Also the tunnel is relying on a single fragile TCP connection. The connection is started from hclient to hserver and is done as root. The tunnel end points are Once on the server and once on the client.

The Linux Programmer’s Toolbox

Connect to the server Connection started on the client and commands are executed on the server. Connect two networks In addition to the p2p setup above, it is more useful to connect two private networks with an SSH VPN using two gates. Suppose for the example, netA is The procedure is similar as above, we only need to add the routing. NAT must be activated on the private interface only if the gates are not the same as the default gateway of their network. Configure the IP addresses of the tunnel. Add the routing for the two networks.

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If necessary, activate NAT on the private interface of the gate. The setup is started from gateA in netA. In this case the clients would not know where to forward the response, and nat must be activated. RSYNC Rsync can almost completely replace cp and scp, furthermore interrupted transfers are efficiently restarted. A trailing slash and the absence thereof has different meanings, the man page is good Rsync uses SSH for the transport per default and will use the ssh key if they are set. Use ":" as with SCP. This is typically used for backups. This is very convenient for automated backups.

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Edit the "Path" system variable and add the full path to the installed rsync, e. This way the commands rsync and ssh are available in a Windows command shell. Automatic backups have to avoid a user interaction, for this the SSH public key authentication can be used and the rsync command will run without a password. All the following commands are executed within a Windows console.

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  6. For example create the file backup. SUDO Sudo is a standard way to give users some administrative rights without giving out the root password. Sudo is very useful in a multi user environment with a mix of server and workstations. It is enclosed in! This is useful for larger setups.

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    User sysadmin can mess around in the DMZ servers with some commands. However note that this is highly insecure. Use aescbc instead of aescbc to get even stronger encryption. This uses also more CPU. Furthermore gpg and also provides an advanced key management system. This section only covers files encryption, not email usage, signing or the Web-Of-Trust.

    The Linux programmer's toolbox /John Fusco. – National Library

    The simplest encryption is with a symmetric cipher. In this case the file is encrypted with a password and anyone who knows the password can decrypt it, thus the keys are not needed. Gpg adds an extention ". The private and public keys are the heart of asymmetric cryptography. What is important to remember: Your public key is used by others to encrypt files that only you as the receiver can decrypt not even the one who encrypted the file can decrypt it.

    The public key is thus meant to be distributed. Your private key is encrypted with your passphrase and is used to decrypt files which were encrypted with your public key. The private key must be kept secure. Also if the key or passphrase is lost, so are all the files encrypted with your public key.