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public text v1 · immutablemail:/tmp # cd test
mail:/tmp/test # touch file1 file2 file3 file4
mail:/tmp/test # ls
file1 file2 file3 file4
mail:/tmp/test # for file in `ls`; do mv $file $file.new ; done
mail:/tmp/test # ls
file1.new file2.new file3.new file4.new