Attributes on expansions and params.

Using default values:

  $ sh -c "echo \${FOOBAR-hello}"
  hello
  $ msh -c "echo \${FOOBAR-hello}"
  hello

Smallest prefix pattern:

  $ cat > test.sh << EOF
  > x="foobar"
  > echo "\${x#foo}"
  > echo "\${x#f*}"
  > echo "\${x#bar}"
  > EOF

  $ sh test.sh 
  bar
  oobar
  foobar
  $ msh test.sh 
  bar
  oobar
  foobar

Largest Prefix Pattern:

  $ cat > test.sh << EOF
  > x=/path/to/my/script.sh
  > echo "\${x##*/}"
  > EOF

  $ sh test.sh
  script.sh
  $ msh test.sh
  script.sh

Smallest suffix pattern:

  $ cat > test.sh << EOF
  > x="foobar"
  > echo "\${x%bar}"
  > echo "\${x%o*}"
  > echo "\${x%foo}"
  > EOF

  $ sh test.sh 
  foo
  fo
  foobar
  $ msh test.sh 
  foo
  fo
  foobar

Largest suffix pattern:

  $ cat > test.sh << EOF
  > x=/path/to/my/script.sh
  > echo "\${x%%*/}"
  > EOF

  $ sh test.sh
  /path/to/my/script.sh
  $ msh test.sh
  /path/to/my/script.sh

Length of param:

  $ cat > test.sh <<EOF
  > foo=hello
  > echo \${#foo}
  > EOF

  $ sh test.sh
  5
  $ msh test.sh
  5

Assigning on the fly:

  $ cat > test.sh << EOF
  > echo \${FOO:=bar}
  > echo \$FOO
  > EOF

  $ sh test.sh
  bar
  bar
  $ msh test.sh
  bar
  bar