Stripping lines which don't include a text phrase

Starting with a .txt file with lines li开发者_开发百科ke

adfgnfghqueendsfgdfg
dfgdfgdfg
gdfgdfgfhsfqueenjkhkjhkjg
hksad,jfhgkfdg

How would I strip the lines which don't have 'queen' in them? (preferably using an OS X Terminal command)

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You can use sed as:

1. Print only lines that have queen in them and make changes inline.

   sed  -i -n '/queen/p' file
   

2. Delete lines that do not have queen in them and make changes inline.

   sed  -i '/queen/!d' file
   

The above command delete if they find the word queen anywhere in the line, even as a part of another word. If this is not what you want and you want to delete only those lines where queen appears a separate word and not as part of another word you can make use of word boundaries \bas:

sed  -i -n '/\bqueen\b/p' file
sed  -i '/\bqueen\b/!d' file

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You can use grep. For example:

grep "queen" file.txt > newfile.txt

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sed '/queen/ d' infile.txt > outfile.txt