Re: Command substitution into argument to convert

From	Lewis <g.kreme@kreme.dont-email.me>
Newsgroups	alt.comp.lang.shell.unix.bourne-bash
Subject	Re: Command substitution into argument to convert
Date	2022-06-14 20:26 +0000
Organization	Miskatonic U
Message-ID	<slrntahrn9.2ok.g.kreme@m1mini.local> (permalink)
References	<t88358$ad1$1@dont-email.me> <slrntafl3g.11f5.g.kreme@zephyrus.local> <t8a0ng$umi$1@dont-email.me>

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In message <t8a0ng$umi$1@dont-email.me> Michael F. Stemper <michael.stemper@gmail.com> wrote:
> On 13/06/2022 19.21, Lewis wrote:
>> In message <t88358$ad1$1@dont-email.me> Michael F. Stemper <michael.stemper@gmail.com> wrote:
>>> I'm trying to time-stamp image files as they're downloaded. The
>>> following works fine:
>> 
>>> $ convert -pointsize 20 -fill black -draw 'text 10,20 "06/13 14:13"' RadarMap.png Stamped.png
>> 
>>> However, hard-coding the time stamp would make it worthless. What
>>> I really want to use is the output of:
>> 
>>> $ date +"%m/%d %H:%M"
>> 
>> So do that.
>> 
>> $ MYDATE=$(date +"%m/%d %H:%M");convert -pointsize 20 -fill black -draw 'text 10,20 "$MYDATE"' RadarMap.png Stamped.png

> No error message is given. The text drawn on the image is:
>    $MYDATE

Then it is still a quoting issue, probably beaus you hav single quotes
around the outside. I do not use the convert tool, so I can’t tell you
specifically what the issue is, but the first thing I wold do is
eliminate the single quotes, assuming they are not required by convert.

$ MYDATE=$(date +"%m/%d %H:%M");convert -pointsize 20 -fill black -draw "text 10,20 $MYDATE" RadarMap.png Stamped.png

or maybe 

$ MYDATE=$(date +"%m/%d %H:%M");convert -pointsize 20 -fill black -draw "text 10,20 \"$MYDATE\"" RadarMap.png Stamped.png

Remember that ' and " ae very different, and ' do not usually allow
expansion of variables contained inside, but sometimes it is hard to
know when a variable is being expanded by the shell and when it is being
passed to the command.

Either way, sometimes you just have to play with the quotes and the
escapes.

-- 
Were it not for frustration and humiliation I suppose the human race
	would get ideas above its station. -Ogden Nash

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Thread

Command substitution into argument to convert "Michael F. Stemper" <michael.stemper@gmail.com> - 2022-06-13 14:28 -0500
  Re: Command substitution into argument to convert "Michael F. Stemper" <michael.stemper@gmail.com> - 2022-06-13 15:29 -0500
  Re: Command substitution into argument to convert Grant Taylor <gtaylor@tnetconsulting.net> - 2022-06-13 16:32 -0600
  Re: Command substitution into argument to convert Lewis <g.kreme@kreme.dont-email.me> - 2022-06-14 00:21 +0000
    Re: Command substitution into argument to convert "Michael F. Stemper" <michael.stemper@gmail.com> - 2022-06-14 07:59 -0500
      Re: Command substitution into argument to convert Lewis <g.kreme@kreme.dont-email.me> - 2022-06-14 20:26 +0000
        Re: Command substitution into argument to convert Lewis <g.kreme@kreme.dont-email.me> - 2022-06-14 23:38 +0000
          Re: Command substitution into argument to convert "Michael F. Stemper" <michael.stemper@gmail.com> - 2022-06-15 07:55 -0500

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