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Old friends pass away, new friends appear. It is just like the days. An old day passes, a new day arrives. The important thing is to make it meaningful: a meaningful friend - or a meaningful day.
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dynamic date value in shell scripts

dynamic date value in shell scripts
using a variable – easier to read in scripts:
NOW=$(date +”%Y%m%d%H%M%S”)
echo “bar” > “$NOW”foobar.txt

one-line, equivalent to above:
echo “bar” > $(date +”%Y%m%d%H%M%S”)foobar.txt

alternate single-line format:
echo “bar” >> $(date “+myfile%Y%m%d.txt”)

man strftime to see formatting values

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