[SOLVED] Using a long Bash command including single quotes and pipes in a Bash script
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It's recommended not to use backticks to embed commands. It's been superseded by the $() form. I don't get any errors when I use location=$(<your_long_command>).
Edit: By the way, you can usually use "sed -e 'expression1' -e 'expression2', to combine your filters into a single command.
Also, I can't be 100% certain because I don't know what your input value is supposed to be, but I'm guessing the error is coming from a '/' value being in the sed input somewhere, messing up the reading of the separators. Or something like that. You can change the sed separator to another character instead (e.g. sed -e 's|ip address flag ||') which also eliminates the error messages.
By the way, just what exactly are you trying to extract from the lynx output anyway? It's likely we can clean up the command and make it more efficient. I tried running it with the ip address of google.com and got nothing.
Last edited by David the H.; 07-22-2009 at 09:33 AM.
Besides that, using all of perl, awk, sed, egrep and grep is, to say the least, an overkill. Either awk or perl should be enough to do all the parsing, or even sed. I'd also drop lynx in favor of wget -O - if possible, it seems to be much standard these days, but that's just my opinion.
I haven't looked deeply into the purpose of that one-liner, but it seems to me that you are creating complication for nothing.
Well, I'd help you to find a better way, but all I'm getting now is a "You reached your limit of 10 lookup queries per day" message, so I can't test it anymore. If you could provide a sample of the output we could work from instead, I'm sure we could give you a cleaner way to get that info.
My goal was to get a string representing the current city in which I am. (I push this string to a list which serves as the source for a web page on which some colleagues of mine can read my latest location update.) Looking for a simple way to extract my current location, I came across a working one liner at http://www.commandlinefu.com/ which produced relevant output for me: