awk or sed to print the character from the previous line after the regexp match - UNIX and Linux Forums
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A Visual Guide to Sed. Mastering the text substitution tool | by Sebastian Carlos | Better Programming
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The command-line GNU sed: become the MASTER of plain text // Part 01 - Basics [Learn by Practicing] - YouTube
SED Tutorial - How to print a particular line, last line, range of lines from a file ~ Oracle Apps Knowledge Sharing
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A Visual Guide to Sed. Mastering the text substitution tool | by Sebastian Carlos | Better Programming
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