How do I print a formatted system date + hostname using printf in bash.
Something like printf "%s:%s\n" date hostname?
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1 Answer
printf "%s:%s\n" "$(date)" "$(hostname)"
6 Comments
devnull
Or more succinctly, thus:
printf "$(date):$(hostname)\n"
Jimson James
@devnull that was cute and simple.
Mikhail T.
Instead of invoking a subshell with date in it, why not simply rely on the date format of bash's built-in implementation of
printf(1)? For example: printf '%(%a %b %d %T %Z %Y)T:%s\n' -1 $(hostname)
berbt
@devnull: that can be problematic. "
printf interprets escape sequences and format specifiers in the format string. If variables are included, any escape sequences or format specifiers in the data will be interpreted too, when you most likely wanted to treat it as data.". From github.com/koalaman/shellcheck/wiki/SC2059
Chazy Chaz
@devnull aside from what was already pointed out, doesn't that defeat the purpose of printf? There's no (string) format whatsoever in your example.
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