How do I break up an extremely long string literal in bash?
mycommand
    --server myserver
    --filename extremely/long/file/name/that/i/would/like/to/be/able/to/break/up/if/possible
    --otherflag
    --anotherflag

# Insufficiently pretty
mycommand
    --server myserver
    --filename extremely/long/file/name/
that/i/would/like/to/be/able/to/break/
up/if/possible
    --otherflag
    --anotherflag

# Doesn't work
mycommand
    --server myserver
    --filename extremely/long/file/name/
         that/i/would/like/to/be/able/to/break/
         up/if/possible
    --otherflag
    --anotherflag

file=extremely/long/file/name
file+=/that/i/would/like/to/be/able/to/break
file+=/up/if/possible

mycommand
    --server myserver
    --filename $file
    --flag flag

mycommand
    --server myserver
    --filename "extremely/long/file/name/"`
      `"that/i/would/like/to/be/able/to/break/"`
      `"up/if/possible"
    --otherflag
    --anotherflag

j(){sed -e ':a;$!N;s/ *n *//g;ta' <<<"$1"}

echo "$(j "3   spaces
           /hello
           /world
           /this
           /is
           /a
           /long
           /path
          ")"

# 3   spaces/hello/world/this/is/a/long/path