WOW...
Thanks for the explanation...
I will need to read up on Sed... However I have used the explanation to help
me modify another script that I needed.
On 4/13/06, Ryan Schmidt <subversion-2006Q1@ryandesign.com> wrote:
>
> Hi Phil. I'll CC the users list on this reply in case anyone else was
> wondering.
>
>
> On Apr 13, 2006, at 22:21, Phil wrote:
>
> > I have two questions about the script. It works great. In fact it
> > helped me modify another script so that I could add comments to the
> > error output.
> >
> > 1- $SED -n 's/^\(A\|.U\)\s*\(.*[^/]\)$/\2/p'` what is this part
> > doing :)
>
> Ah, regular expressions. My favorite. :-) sed is not my favorite. But
> it'll do in a pinch.
>
> sed normally prints all lines of its input. I wanted only certain
> lines. So "-n" tells it not to print by default, and the "p" at the
> end of the line says to print the things that match the preceding
> regular expression.
>
> The "s" at the beginning of the argument to sed means "substitute." I
> want to replace the thing I match with another thing. What I match is
> this:
>
> ^\(A\|.U\)\s*\(.*[^/]\)$
>
> Breaking it down:
>
> ^ anchor the match to the beginning of the line
> \(A\|.U\) an "A" as the first character (meaning the item was
> added), or
> a "U" as the second character (meaning its properties
> were updated)
> \s* any amount of whitespace
> \(.*[^/]\) any amount of anything that doesn't end in a slash -- so
> this
> is how the directories are excluded, since they end in a
> slash
> $ anchor the match to the end of the line
>
> Then, after the next slash, is what I replace this all with: \2,
> meaning the second parenthesized expression above, meaning the path
> of the file.
>
>
> > 2- # Attempt to get the svn:needs-lock property.
> > $SVNLOOK propget -t "$TXN" "$REPO" svn:needs-lock "$a_file" >/
> > dev/null 2>&1
> >
> > # Exit and alert if an error occurred doing that.
> > if [ $? -ne 0 ]; then
> > echo "File $a_file doesn't have the svn:needs-lock property
> > set." 1>&2
> > echo "Repository policy dictates that all files must set
> > the svn:needs-lock property." 1>&2
> > exit 1
> > fi
> >
> > why is is I need the 2>1& and the 1>2& added to these lines?
>
> I only cared about the exit code of svnlook. I didn't care about its
> stdout or stderr output and wanted to throw it away. So I directed
> stdout to the trash (">/dev/null") and sent stderr to the same place
> I'd just sent stdout ("2>&1").
>
> If a pre-commit hook exits with a nonzero status, then the svn client
> will output to the user's screen anything that the hook emitted on
> stderr. Anything sent to stdout is ignored. echo sends its output to
> stdout, not stderr, so I had to redirect stdout (stream 1) to stderr
> (stream 2) for it to go to the right place for the svn client to see it.
>
>
>
>
Received on Mon Apr 17 15:23:05 2006