Code and comments
I wish I could grep my car keys sometimes.
Back in the 80s/90s there were keyrings that would play an alarm if they heard a whistle at a particular frequency. You’re basically playing Marco Polo with your keys.
I assume they lost popularity because the batteries tended to run out at inopportune times. Batteries are better now. Maybe it’s time those things made a comeback.
My 5 cents:
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When piping output of
findtoxargs, always use-print0option offindand-0option ofxargs. This allows processing files with any allowed characters in names (spaces, new lines etc.). (However I prefer-exec.) -
There’s an
icommand to insert a line insed, it is better to use it instead ofs/^/...\n/. It makes code more readable (if we can talk about readability ofsedcode, huh). -
If you want to split a delimiter separated line and print some field, you need
cut. Keepawkfor more complicated tasks.
agree with one and two and younger me would have agreed with your third point but I think I don’t anymore.
yes cut is the simpler and mostly functional tool you need for those tasks.
but it is just so common to need a slight tweak or to want to substitute something or to want to do a specific regex match or weird multi character delimiter or something and you can do it all easily in awk instead of having to pipe three extra times to do everything with the simplest tool.
- If you want to split a delimiter separated line and print some field, you need cut. Keep awk for more complicated tasks.
Depends on the delimiter too! For anyone else reading this, sed accepts many kinds of delimiters.
sed "s@thing@thing2@g" file.txtis valid. I use this sometimes when parsing/replacing text with lots of slashes (like directory lists) so I can avoid escaping a ton of stuff.I know, but it is not the case I was talking about. I meant widely used commands like
awk '{print $2}'that can be replaced withcut -f2.I know you know, as you already demonstrated your higher understanding. I just wanted to add a little bonus trick for anyone reading that doesn’t know, and is learning from your examples.
the two are valid and no one is more correct than the other sooo…
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I always found “find” very confusing. Currently, I’m using “fd”, which I think has a more sensible UX
What software did you use to put the slide deck together? It seems to work so nicely when placed on a webpage, too…
I don’t know what OP used, but it could be any one of the Markdown presentation tools.
I like reveal.js
Your presentation can go in git, looks good anywhere, and easily shared. It’s just html rendered.
I’ve gotten tired of weird regex stuff in awk, sed, and grep, so I’ve moved to perl -E for all but the most basic of things.
In most cases extended POSIX regexes are enough and looks the same as perl regexes.
I also used perl until I needed to write highly portable scripts that can be run on systems without perl interpreter (e.g. some minimal linux containers). Simple things are also simple to do with grep/sed/awk, more complex things can be done with awk but require a longer code in comparison with perl.
Way too many ads on that link for me to read the actual content.
