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Almost every use of "cat SINGLEFILE | ...somecommand..." is wrong. Learn!
If anybody was wondering why UNIX hasn't taken over the world, there you go. There is absolutely nothing wrong about this use of cat. No, it's not necessary, but it works just fine. In this particular instance, it's my preferred idiom for searching a single file, because I can't reliable remember whether grep's command-line syntax is "grep pattern file" or "grep file pattern." In other words, I can't remember whether to think "search for this in that" or "search that for this." With cat and a pipe, I don't have to. UNIX is great. UNIX is fantastic. People who look at a perfectly good way of doing something with UNIX and fly off the handle, call it wrong, and command those who use it to "Learn!" kinda suck, however.
View a Lord of the Rings timeline easter egg in calendar
I can't reliable remember whether grep's command-line syntax is "grep pattern file" or "grep file pattern."
Here's a way that I remember. Grep searches multiple files for one pattern. That means that you specify the pattern first, then a bunch of files. "grep pat *" searches all files for the pattern "pat". With this in mind, it's relatively easily to reminder, since "grep * pat" is simply never seen. Don't know if this helps, but it works for me. --- |
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