Hi Fishers,
In fish, command substitution returns a list when the command outputs
multiple lines, like this:
> function foo; echo $argv[1]; end
> foo (echo a; echo b; echo c)
a
But what do you do when you need the output as one word? (Where, in
Other Shells, you might do ‘foo "$(echo a; echo b; echo c)"’.)
Here's the problem that leads me to ask this: I wanted to tell
subversion to ignore all files present in my directory that are not
already under version control. This command gets me a list of those files:
> alias svnlist "svn st | grep '\?' | tr -s ' ' | cut -d ' ' -f 2"
It outputs one file per line, which is just the format that the
‘svn:ignore’ property expects. But this
> svn ps svn:ignore (svnlist) .
fails because the property value must be a single word. On the other
hand, this
> svn ps svn:ignore (svnlist | tr '\n' ' ') .
as well as this
> set tmp (svnlist); svn ps svn:ignore "$tmp" .
does not work because it puts all the files on one line.
In the present case you can use ‘svn propset’s --file option, either
with standard input
> svnlist | svn ps svn:ignore -F - .
or in combination with ‘psub’. One of these workarounds is likely to
work in many cases. But still, is there a way to capture the exact
output of a command?
Elias
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