query: Script to `grep` a file with variable
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positive_passages.text: Use of quotes in GNU grep regular expressions
negative_passages.docid: 158360
negative_passages.text: How can I "grep" patterns across multiple lines?
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negative_passages.text: How does grep work?
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negative_passages.text: Replace a string in shell script using a variable
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negative_passages.text: Using grep to find a string
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negative_passages.text: How do I read a variable from a file?