Bash Cookbook [unix shell programming] by Carl Albing, JP Vossen, Cameron Newham

By Carl Albing, JP Vossen, Cameron Newham

The main to studying any Unix method, particularly Linux and Mac OS X, is an intensive wisdom of shell scripting. Scripting is how to harness and customise the facility of any Unix method, and it really is an important ability for any Unix clients, together with process directors OS X builders. yet underneath this straightforward promise lies a treacherous ocean of diversifications in Unix instructions and standards.
bash Cookbook teaches shell scripting the way in which Unix masters perform the craft. It offers a number of recipes and methods for all degrees of shell programmers in order that a person can develop into a knowledgeable person of the most typical Unix shell -- the bash shell -- and cygwin or different well known Unix emulation programs. Packed filled with priceless scripts, in addition to examples that specify the right way to create higher scripts, this new cookbook offers pros and tool clients every thing they should automate regimen initiatives and allow them to really deal with their structures -- instead of have their structures deal with them.

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The official reference guide is also strongly recommended; see below for details. html). gnu. org/gnu/bash/. We highly recommend downloading both the source and the documentation even if you are using prepackaged binaries. Here is a brief list of the documentation. See Appendix B for an index of the included examples and source code. ps files are postscript versions of the above. html files are HTML versions of the manpage and reference manual. 0 files are formatted manual pages. txt versions are ASCII—the output of groff -Tascii.

Normal_dot_file You can use echo * as an emergency substitute for ls if the ls command is corrupt or not available for some reason. This works because * is expanded by the shell to everything in the current directory, which results in a list similar to what you’d get with ls. 6 Using Shell Quoting Problem You need a rule of thumb for using command-line quoting. Solution Enclose a string in single quotes unless it contains elements that you want the shell to interpolate. Discussion Unquoted text and even text enclosed in double quotes is subject to shell expansion and substitution.

Therefore, it’s best to leave the default shell for root unchanged. However, there’s no reason not to make bash the default shell for regular user accounts. And it goes without saying that it’s bad practice to use the root account unless it’s absolutely necessary. Use your regular (user) account whenever possible. 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.

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