Make tests work on Solaris: - replacement for mktemp - fall back if shell arithmetic doesn't work - replacement for 'set -x' (which results look different with some shells) - "FOO=bar; export FOO" instead of "export FOO=bar" - don't use 'if ! ...'

#!/bin/sh

hg init
touch a
hg add a
hg ci -m "a" -d "0 0"

echo 123 > b
hg add b
hg diff | sed "s/\(\(---\|+++\) [^ \t]*\)[ \t].*/\1/"

hg diff -r tip | sed "s/\(\(---\|+++\) [^ \t]*\)[ \t].*/\1/"