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The first and last sentence should use the word "Free.zip" (should skip 4 Download Free.zip). The second-to-last sentence should be a list of three things you can do with the free download: "Unzip it, change its folder name", "Run it as an app", and "Run it as a command line tool". This post summarizes some common ways to use Unix utilities like grep and zsh that you may not know about, including using grep to search through files for regular expressions, using zsh to operate on text using pipelines, and using zsh's directory stack to easily navigate your way around a big file or directory tree. Binary Spaces in Bash Let's start by looking at the "usual" way to perform a grep search in Bash. The command syntax is grep -i string pattern-string . Where pattern-string is a regular expression and string is the text you want to find. The "-i" (ignore case) argument tells grep to ignore any differences in case and treat both strings as the same. The "-i" argument further allows you to specify an ignore pattern, which can be useful if you don't want to search for all matching patterns (for example, you might only want to ignore case-converted characters). To search for both the word "yes" and "Yes", you could use an ignore pattern of "i". So you would run grep -i i yes Yes . Anyone who's worked in Unix for a while will be familiar with using pipes to join two or more utilities together to perform a task. A pipe is created by putting one utility's output directly into another utility's input. For example, to display all of the lines of a text file ending in "foo" (i.e., lines ending with an end-of-line marker of " ") you could use the following command: echo 'lines' | grep -E '^$' | sort | uniq > lines.uniq This will display all the lines in a file (lines) and tell you if any of those lines end with a dot (indicating the end of file). Then, we use sort to turn that into sorted, non-overlapping lists of lines. Finally we run uniq on that list and store the result in a new file named "lines.uniq". One nice thing about Unix utilities is that you can also chain their output together. For example, if you wanted to display all lines which contain the string "foo" in grep, but only if the word was at least 3 characters long, you could use the following command: "lines" | grep -L 'foo' Notice that this uses two different commands instead of just one. The first part of this command runs grep on lines and then pipes the output into sort. That will sort files with text ending in foo alphabetically. The "-L" (lowercase L) argument tells sort to look at each line of each file and choose the ten longest strings for comparison purposes. cfa1e77820
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