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Beware of two opening parentheses in a row, as some shell implementations mishandle them. For example, `pdksh' 5.2.14 misparses the following code:
if ((true) || false); then echo ok fi
To work around this problem, insert a space between the two opening parentheses. There is a similar problem and workaround with `$(('; see Shell Substitutions.
Posix requires support for case
patterns with opening
parentheses like this:
case $file_name in (*.c) echo "C source code";; esac
but the (
in this example is not portable to many older Bourne
shell implementations. It can be omitted safely.