Bash Cookbook [unix shell programming]

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On most Linux systems, locate is a symbolic link to slocate ; other systems may have separate programs, or may not have slocate at all.

bash Cookbook (Engels) door Carl Albing, J.P. Vossen (Boek) -

Last but not least, try using ls. Remember, if the command you wish to run is in your current directory, you must prefix it with a. Recipe 4. The command ls shows only filenames, while -l provides more details about each file. Useful options include:. Like -a , but skips the two common directories. For example, these options produce output that is similar to ls -l :. Not all operating systems and versions have all of these tools.

For example, Solaris does not include stat by default. It is also worth pointing out that directories are nothing more than files that the operating system knows to treat specially, so the commands shown here will work just fine on directories, though sometimes you may need to modify a command to get the behavior you want. For example, use ls -d to list information about the directory itself, rather than just ls which lists the contents of the directory.

Since every normal directory contains a. You can use ls -A to list all the files in a directory except those two.

For other commands where you list files with a wildcard i. Due to the way the shell handles file wildcards, the sequence. Characters enclosed in [] specify a list or range of characters, any of which will match. Given that, you might think that. The problem is that. Instead of getting just the dot files in the current directory, then, you get those files plus all the files and directories in the current directory.

This can be very confusing, to say the least, and is usually more than you want. You can experiment with the same ls command with -d and without, then try echo. The echo command simply shows you what the shell expands your. Try echo. So here we are looking for a dot, followed by any character that is not a dot, followed by any number of any characters.

There is one other special case in the ls command that helps out here. If the -d option is specified and if the filename pattern ends with a slash, then only directories that match that pattern, rather than all filenames that match, are displayed by the ls command. The first command shows the three filenames that begin with. The second command in this example uses a trailing slash on the pattern. If you see double slashes on the output of the ls -d. Use a backslash in front of the command name to avoid any alias:. Some combinations are just difficult to match.

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You could add something like.?? Or you can use.?? Which you use depends on your needs and environment; there is no good one-size-fits-all solution.

You need a rule of thumb for using command-line quoting. Enclose a string in single quotes unless it contains elements that you want the shell to interpolate. Unquoted text and even text enclosed in double quotes is subject to shell expansion and substitution. In the second example, the same is true, but we never even get there because! The third example works as expected. The exclamation point is a special case because the preceding backslash escape character is not removed.

You can work around that by using single quotes or a trailing space, as shown here:. But you can work around that by using double quotes with escapes, or by escaping a single quote outside of surrounding single quotes. You want to replace a builtin command with your own function or external command, and you need to know exactly what your script is executing e. Use the type and which commands to see if a given command exists and whether it is built in or external:.

A builtin command is just that; it is built into the shell itself, while an external command is an external file launched by the shell. The external file may be a binary, or it may be a shell script itself, and it is important to understand the difference for a couple of reasons. First, when you are using a given version of a particular shell, builtins will always be available but external programs may or may not be installed on a particular system.

Second, if you give one of your own programs the same name as a builtin, you will be very confused about the results since the builtin will always take precedence see Recipe It is possible to use the enable command to turn builtin commands off and on, though we strongly recommend against doing so unless you are absolutely sure you understand what you are doing. When you need to redefine a builtin you use the builtin command to avoid loops.

For example, we can define a shell function see Recipe To force the use of an external command instead of any function or builtin that would otherwise have precedence, use enable -n , which turns off shell builtins, or command , which ignores shell functions. Or, use command ls to use the native ls command rather than any ls function you may have created. You have some code you want to run only if you are or are not running interactively.

See a Problem?

It will contain i if the shell is interactive. Recipe 6. First, make sure bash is installed. Try typing bash --version at a command line. Otherwise, ask your system administrator where bash is, or if it can be installed. As root , you can just edit the last field of the lines in the password file to the full pathname of whatever shell you choose.

If your system has a vipw command, you should use it to ensure password file consistency. If bash is not listed in that file, you will have to have your system administrator add it. Use your regular user account whenever possible.

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With commands like sudo , you should very rarely need a root shell. If all else fails, you can probably replace your existing login shell with bash using exec , but this is not for the faint of heart. You need to keep both bash and your entire system up-to-date with security patches. Keeping your entire system up-to-date is out of the scope of this book; consult your system administrator and documentation. How you keep bash up-to-date depends on how you got it in the first place.

That may not be the case if you are using a very old system that is no longer supported, in which case you need to update the entire thing. If you installed from source, it will be up to you to update your source and rebuild as appropriate. You want to get bash for your Linux system, or you want to make sure you have the latest version.

You must be root or have sudo or the root password to upgrade or install applications. See Recipe For Debian and Debian-derived systems such as Ubuntu and Linux Mint, use one of the various graphical user interface GUI tools or a command-line tool such as apt-get , aptitude , or apt to make sure it is installed and current:. For a command line only, use:. You may also use the command-line rpm tool.

Fortunately, much of that evolution is in the area of ease of use, so it should not be very difficult to figure out how to install software on your distribution of choice. When using LiveCDs, software updates and installations will most likely fail due to the read-only media. Versions of such distributions that have been installed to a hard disk should be updatable. If you are wondering what version of bash is available in a given Linux distribution, search for the distro on DistroWatch.

If you are an experienced BSD user, you may prefer using the ports collection, but we will not cover that here. If you are wondering what version of bash is available in a given BSD distribution, search for the distro on DistroWatch. For FreeBSD, use the command:. You may have to adjust the FTP path for your version and architecture. Also, there may be a statically compiled version.

1. Introduction

You want to get bash for your Mac, or you want to make sure you have the latest version. There are also precompiled OS X packages of bash You want to get bash for your Unix system, or you want to make sure you have the latest version. Solaris 2. Oracle ships bash AIX users can get precompiled versions of bash IBM makes bash HP-UX users can get bash You want to get bash for your Windows system, or you want to make sure you have the latest version.

Use Cygwin or Ubuntu on Windows, or a virtual machine. Download Cygwin and run it. Follow the prompts and choose the packages to install, including bash , which is located in the shells category and is selected by default. Once Cygwin is installed, you will have to configure it. For Ubuntu on Windows you need a version of Windows 10 from summer or newer; then follow the install instructions, detailed in the Discussion.

Top 6 Books For Unix And Shell Scripting Beginners

To use a virtual machine, see Recipe Finally, though we hate to say it, maybe the right solution is to use native tools like PowerShell. Cygwin is a Linux-like environment for Windows that provides a Linux look and feel. You must rebuild your application from source if you want it to run on Windows. Again, you need to build your apps from source if you want to take advantage of Cygwin functionality.

The Cygwin DLL currently works with all recent, commercially released x86 32 bit and 64 bit versions of Windows, starting with Windows Vista. Cygwin is a true Unix-like environment running on top of Windows. He has worked for large companies and small startups, in technical as well as in managerial and marketing roles. Carl's software projects, past and present, involve the design and development of distributed computing software, medical image processing applications, compilers, medical devices, web-based factory floor automation, and more.

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Carl's education includes a Ph. He has spoken at conferences and training seminars in the US, Canada and Europe as well as local high schools and colleges. Carl enjoys speaking at user groups and seminars on Linux, C, Java, and bash topics. JP Vossen has been working with computers since the early 80s and has been in the IT industry since the early 90s, specializing in Information Security since the late 90s.

He's been fascinated with scripting and automation since he first understood what an autoexec. On those few occasion when he's not in front of a computer, he is usually taking something apart, putting something together, or both. Cameron Newham lives in Perth, Western Australia. After completing a Bachelor of Science majoring in information technology and geography at the University of Western Australia, Cameron joined Universal Defence Systems later to become Australian Defence Industries as a software engineer.

He has been with ADI for six years, working on various aspects of command and control systems. In his spare time Cameron can be found surfing the Internet, ballroom dancing, or driving his sports car.