cd /sys/src/cmd; ./test '(' ! -f does-not-exist -o -f /dev/null ')' && echo 'test passes' || echo 'test fails'
test passes
cd /sys/src/cmd; ./test '(' ! -f does-not-exist ')' && echo 'test passes' || echo 'test fails'
test passes
cd /sys/src/cmd; ./test '(' ! -f does-not-exist ')' && echo 'test passes' || echo 'test fails'
test passes
cd /sys/src/cmd; ./test '(' -f does-not-exist ')' && echo 'test passes' || echo 'test fails'
test fails
cd /sys/src/cmd; ./test '(' ! -f does-not-exist -o -f /dev/null ')' -a -f /dev/null && echo 'test passes' || echo 'test fails'
test passes