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[personal profile] chebe2011-04-28 07:47 pm
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Removing Windows carriage-returns from text files

Hey all, don't think I've seen this here before, and I know there are many ways of doing this, so I thought, in a fit of geekery, that it might be fun to try and collect them all! Afterall everyone does have their own favourite programs.

I posted this at my own journal when I first came across it, but here's a new one as well;

sed -i 's/\r//' $file_name

perl -pi -e 's/\r\n/\n/g' $file_name
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karmag: Stylized face based on Dreamwidth logo (Default)
[personal profile] karmag2010-11-02 08:58 pm
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Parameter expansion to loop over pairs: ${a%b} and ${a#b}

Hey, a command line community? That's a pretty neat thing to have.

So to introduce myself, here's something I figured out pretty recently. It's in one of those eyes-glazing-over parts of the shell man page (but I had a specific problem to solve so I had to figure it out). Behold! It is a piece of "parameter expansion" magic:

$ TEST='foo:bar' ; echo ${TEST%:*} ${TEST#*:}
foo bar

Ooh, exciting! No wait, it's not. But here's the problem I had: How can I loop over pairs of values in a script or one-liner?

The solution I came up with looked something like this:

$ for f in url1:filename1 url2:filename2 url3:filename3;
do URL=${f%:*}; FILENAME=${f#*:} ;
...
; done

...and so for each pair, URL and FILENAME gets set to their respective portion. (And you'll be glad to learn that I got my Youtube-mediated crime drama fix in the end.)

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