# simplest case
cat <(echo "hello 1")

# can have more than one
cat <(echo "hello 2") <(echo "hello 3")

# doesn't work in quotes
echo "<(echo \"hello 0\")"

# process substitution can be nested inside command substitution
echo $(cat <(echo "hello 4"))

# example from http://wiki.bash-hackers.org/syntax/expansion/proc_subst
# process substitutions can be passed to a function as parameters or
# variables
f() {
	cat "$1" >"$x"
}
x=>(tr '[:lower:]' '[:upper:]') f <(echo 'hi there')

# process substitution can be combined with redirection on exec
rm -f err
# save stderr
exec 4>&2
# copy stderr to a file
exec 2> >(tee err)
echo "hello error" >&2
sync
# restore stderr
exec 2>&4
cat err
rm -f err
echo "hello stderr" >&2