Concatenating text and command output in Bash script to output to file

问题

I'm writing a bash script in FreeBSD that appends commands to a log file. Before I execute the commands that will append the log data, I want to print a line in the file which shows the current date above the data, like this:

---Tue Aug 20 17:26:37 EDT 2019---

I know that I can use the date command to output the timestamp, but I'm not sure how to include the "---" before and after the timestamp to add to the file. What's the simplest way to do this?

回答1:

You can pass a format string to date:

date '+---%a %b %e %H:%M:%S %Z %Y---'

来源：https://stackoverflow.com/questions/57581745/concatenating-text-and-command-output-in-bash-script-to-output-to-file