delete environment variable command line unix

... the :? syntax, if the username variable is defined and it has a non-null value, the value of the username variable is used in the echo command. If the username variable is defined but does not ... used. If that variable is set to only a null value, then that value is used. If, however, the username variable is undefined, the script will exit and display the variable, the line of code ... result, this command uses the value of the LOGNAME variable for the echo com- mand, and sets the value of username to the value of LOGNAME. 32 CHAPTER 5 ■ ACCEPTING COMMAND- LINE OPTIONS,...

Ngày tải lên: 05/10/2013, 08:51

... the uuencode and uudecode commands are not installed on your system, you can find the appro- priate installation package of the UNIX sharutils utilities, where both commands are included. A version ... received it, I copied the headers into the test message. I have preserved the line spacing of the copied message. Notice the line in the preceding code that defines a boundary string ( mime- attachment-boundary). ... destination address manually. Finally we remove the temporary file for cleanup. 151 ■ ■ ■ CHAPTER 23 Command- Line E-mail Attachments I often send e-mail to myself containing information gathered from...

Ngày tải lên: 05/10/2013, 08:51

... com- mand line is command and file completion. With this feature, you can start to type a path or command, and once you’ve typed a sufficient number of characters for the path or command to ... entry to /home/rbpeters. Pressing Enter then executes the command. 100 CHAPTER 15 ■ COMMAND- LINE EDITING AND HISTORY When you enter command mode you start at the bottom of your history and ... history list. Once you have found the desired command, you can make any appropriate modifications and press Enter to run the command. One last command- history function that has been extremely...

Ngày tải lên: 05/10/2013, 08:51

... and reuse. 1. To read a file line- by -line where the lines contain more than a single “word,” refer to Chapter 10. 104 CHAPTER 16 ■ SCRIPTING FROM THE COMMAND LINE concurrent package installation ... lines at once), you can return to the previous (mistyped) command in your history and then edit the command sequence using vi-style command- line editing. You can also recall a previously entered ... kinds of scripts efficiently is command- line recall, which is discussed in Chapter 15. If you make a mistake while typing (not unlikely when you’re working with many lines at once), you can return...

Ngày tải lên: 05/10/2013, 08:51

... IDE: ECLIPSING THE COMMAND LINE3 4 9810ch02.qxd 5/15/08 11:04 AM Page 34 The IDE: Eclipsing the Command Line T here are two main ways you can work with Python: through the command line or through an ... you’ll learn how to use it both from the command line and from within Eclipse using the Subversive plug-in. CHAPTER 2 ■ THE IDE: ECLIPSING THE COMMAND LINE4 0 9810ch02.qxd 5/15/08 11:04 AM Page ... 2 ■ THE IDE: ECLIPSING THE COMMAND LINE 27 9810ch02.qxd 5/15/08 11:04 AM Page 27 Summary Eclipse is an increasingly popular IDE that offers many advantages over the command line. It’s free, and it...

Ngày tải lên: 05/10/2013, 10:20

... ping and arp from the Command Line In chapter 9, we looked at the ping and arp commands. These are available from the web interface but they are also available from the command line. To ping another ... The directory must be empty. eg. rmdir temp rm Remove (delete) a file. eg. rm deleteme rm - rf Remove (delete) a non empty directory and delete all the file and sub directories in it. Use with ... two computers. It is most commonly used as a secure command line interface to a remote computer. This means that you can access the command line interface of the FreeNAS server from a remote computer...

Ngày tải lên: 19/10/2013, 01:20

... Features 234 Command Tokens 234 Command Line Completion 234 Moving About the Command Line 236 Context-Sensitive Help 236 History 237 Disabling/Enabling CLI Tracing 237 Aborting an Executing Command ... 309 Command History 311 Examples 311 Chapter 11 Martian Addresses Overview 314 Martian Address Commands 314 martian 315 Name 315 Syntax 315 Mode 315 Parameters 315 Description 316 Default 316 Command ... 652 Default 653 Command History 653 Table of Contents 27 Default 498 Command History 498 Examples 498 neighbor use-med 499 Name 499 Syntax 499 Mode 499 Parameters 499 Description 499 Default 500 Command...

Ngày tải lên: 19/10/2013, 12:15

... this command line creates a new message with report.doc attached: ã "C:\Program Files\Microsoft Office\Office11\Outlook.exe " ã /a "C:\My Documents\report.doc" The command- line ... "C:\My Documents\report.doc" The command- line examples might be printed on two or more lines, but when typing them in, use one line and leave a space before the slash (/), as seen ... many cases, the following group of commands is more appropriate to use to programmatically use a feature, rather than for regular use. The format of the command line needed for these switches is...

Ngày tải lên: 24/10/2013, 06:15

... section will give you an overview of most of the command- line switches that are available. Command- Line Syntax In Table B-5, you can see all the command- line switches understood by the Visual Basic ... tools and will also detail the command- line usages of vbc.exe. Command Utilities In order to be able to run these command- line utilities, you must configure the environment properly. The Visual ... installation includes a command file (VCVARS32.bat) that configures the command environment properly by setting the path variable to include the Visual Studio .NET directory. The command file is installed...

Ngày tải lên: 04/11/2013, 16:15

Ngày tải lên: 20/11/2013, 21:24

... /all IP Configuration (Display DNS Cache Contents) ipconfig /displaydns IP Configuration (Delete DNS Cache Contents) ipconfig /flushdns IP Configuration (Release All Connections) ipconfig ... certmgr.msc Character Map charmap Check Disk Utility chkdsk Clipboard Viewer clipbrd Command Prompt cmd Component Services dcomcnfg Computer Management compmgmt.msc Date...

Ngày tải lên: 09/12/2013, 22:15

... ARE authenticated. Command- Line Basics The command line is important, because a system administrator can do anything from it. Linux has many, many commands, more than you will ever know, and new commands ... ,INUX COMMAND HAS .EXT we’ll talk about characters that you can and can’t use in Linux commands. Figure 1-4 shows what a command line looks like, when started as a terminal from a graphical environment. Figure ... the source code of the command. /PTIONS ARE VERY SPECIFIC TO THE COMMAND YOU USE 3OME COMMANDS DONT HAVE ANY OPTIONS and other commands can have more than 50. The i]j command normally gives...

Ngày tải lên: 10/12/2013, 14:15

... EXEC Mode (the enable Command) 6 43 Cisco Security Appliance Command Line Configuration Guide OL-12172-01 About This Guide Document Conventions Document Conventions Command descriptions use ... ã Examples depict screen displays and the command line in screen font. ã Information you need to enter in examples is shown in boldface screen font. ã Variables for which you must supply a ... 527-0883 Cisco Security Appliance Command Line Configuration Guide For the Cisco ASA 5500 Series and Cisco PIX 500 Series Software Version 8.0 Customer Order Number: N/A, Online only Text Part Number:...

Ngày tải lên: 21/12/2013, 05:18

... __________________________________________________________________________ Step 9 Use the command history feature a. Use the command history to see and reuse the previously entered commands. Press the up arrow or Ctrl-p to see the last entered command. Press it ... Step 6 List the show commands a. List all show commands by entering show ? at the router privileged EXEC prompt. Router#show ? b. Is running-config one of the available commands from this mode? ... configuration by using the command show running-config at the privileged EXEC router prompt. Router#show running-config b. List six key pieces of information shown with this command: ...

Ngày tải lên: 18/01/2014, 04:20

... li t kê n i dung c a th m c ệ ộ ủ ư ụ root (bao g m c file n).ồ ả ẩ command option arguments 1 The Command The Command Line Line Tài Li u H ng D n H c ệ ướ ẫ ọ Tài Li u H ng D n H c ệ ướ ẫ ọ Linux ... 2 The Command Line The Command Line  Giới thiệu dòng lệnh  Cú pháp dòng lệnh  Một số lệnh thông dụng  Chuyển hướng ... nhệ Cú pháp dòng l nhệ  Cú pháp c a m t dòng l nh g m có ba thnh ph n: < ;command& gt; [option] [arguments] ã command: h th ng s lm gỡ? ã option: h th ng s lm gỡ? ã arguments: h th ng...

Ngày tải lên: 21/01/2014, 18:20

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