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The "stream editor" (sed) is a useful tool for changing the contents of a file (or stream).
- E.g. sed s/apples/oranges/ myfile.txt will change the first occurrence of "apples" on each line of myfile.txt into "oranges". To change every occurrence, do the following: sed s/apples/oranges/g myfile.txt.
sed is great in scripts, but it can also be used from the command line. E.g., in conjunction with the foreach command, it's a handy way to rename lots of files, like all *.JPEG files to *.jpg (EFTS).