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sed semantics:
read lines one at a time into the pattern space
examine elements of the script one at a time for matching patterns
execute matching commands
after executing the script, print the pattern space
(unless interrupted by the d or q command)
Problem: no variables
No problem—sed has a "hold space"
Use it for holding data for later processing
x command exchanges hold and pattern spaces
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Copyright © 2011 M. J. Dominus |