The sed command is used to perform basic text transformations. In the example provided, 's/quick/slow/' is a substitute command that tells sed to replace the first occurrence of the pattern 'quick' with the replacement 'slow'. The result is the output of the initial string with the word 'quick' replaced by 'slow'.
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What does the 'sed' command do?
What other options can I use with the 'sed' command?
What are regular expressions and how are they used in 'sed'?