On Tue, Nov 15, 2016 at 10:30 AM, Rich Shepard <[email protected]> wrote:
> Trying to change the date format from a forward slash (/) to a dash (-).
> There's a syntax error in my sed script: "file change-date-format.sed line
> 6: invalid reference \3 on `s' command's RHS" and I'm not seeing why. Here's
> the script:
>
> #!/usr/bin/sed
> #
> # Change date format from / to -.
>
> s/[0-9]\{4\}\/[0-9]\{2\}\/[0-9]\{2\}/\1-\2-\3/g
>
> Please show me what I've done incorrectly here.
Example input and sample expected data would be helpful. But if I
were to guess (which is usually a really bad idea), your input date
string looks like this:
1996/03/10
and you want your output data to look like this:
1996-03-10
If that's correct (highly unlikely because I am guessing), then this would work:
$ <<< '1996/03/10' tr / -
1996-03-10
But if you insist on sed:
$ <<< '1996/03/10' sed -e 's#/#-#g'
1996-03-10
Or insist on sed using groups:
$ <<< '1996/03/10' sed -e
's#\([0-9]\{4\}\)\/\([0-9]\{2\}\)\/\([0-9]\{2\}\)#\1-\2-\3#g'
1996-03-10
or
$ <<< '1996/03/10' sed -re
's#([0-9]\{4\})\/([0-9]\{2\})\/([0-9]\{2\})#\1-\2-\3#g'
1996/03/10
Good luck and let us know what works for you.
Regards,
- Robert
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