By Carl Albing
The major to learning any Unix method, in particular Linux and Mac OS X, is an intensive wisdom of shell scripting. Scripting is how to harness and customise the ability of any Unix approach, and it is a necessary 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 criteria. bash Cookbook teaches shell scripting the way in which Unix masters perform the craft. It offers numerous recipes and tips for all degrees of shell programmers in order that somebody can develop into a trained person of the commonest Unix shell -- the bash shell -- and cygwin or different renowned Unix emulation programs. Packed filled with priceless scripts, besides examples that designate how you can create higher scripts, this new cookbook supplies pros and gear clients every little thing they should automate regimen initiatives and permit them to actually deal with their platforms -- instead of have their structures deal with them.
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Additional info for bash Cookbook: Solutions and Examples for bash Users (O'Reilly Cookbooks)
5 Showing All Hidden (dot) Files in the Current Directory Problem You want to see only hidden (dot) files in a directory to edit a file you forget the name of or remove obsolete files. * doesn’t do what you think it will. Solution Use ls -d along with whatever other criteria you have. ]* Or construct your wildcard in such a way that . and .. don’t match. * does not behave as you might expect or desire. , or [ is treated as a pattern, and replaced by an alphabetically sorted list of file names matching the pattern.
To match anything starting with a dot that is also at least three characters long. * will then display anything that matches both patterns twice. a. Which you use depends on your needs and environment; there is no good one-size-fits-all solution. $ ls -a . 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.
Solution Use the head or tail commands. By default, head will output the first 10 lines and tail will output the last 10 lines of the given file. If more than one file is given, the appropriate lines from each of them are output. , -5) to change the number of lines. tail also has the -f and -F switches, which follow the end of the file as it is written to. ” Using Just the Beginning or End of a File | 39 Discussion head and tail, along with cat, grep, sort, cut, and uniq, are some of the most commonly used Unix text processing tools out there.