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When I go to change a configuration file I always like to make a backup first. You can use "cp -p" to preserve the modification time, but it gets confusing to have file.prev, file.prev2, etc. So I like to add a YYMMDD suffix that shows when the file was last changed. "stat -c %Y" gives you the modification time in epoch seconds, then "date -d @" converts that to whatever format you specify in your "+format" string. Show Sample Output
3cp file file.$(date -d @$(stat -c '%Y' file) "+%y%m%d") -
If your `date` command has `-r` option, you don't need `stat`
3cp file{,.$(date -r file "+%y%m%d")}
What do you think?
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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