echo $(( ++7 ))
echo $(( --7 ))
+# combinations of expansions
+echo $(( "`echo 1+1`" ))
+echo $(( `echo 1+1` ))
+
${THIS_SH} ./arith1.sub
${THIS_SH} ./arith2.sub
${THIS_SH} ./arith3.sub
# problems with suppressing evaluation present through bash-4.2
${THIS_SH} ./arith6.sub
+# problems with parsing arithmetic expressions containing colons that are
+# part of word expansions such as substring extraction
+${THIS_SH} ./arith7.sub
+
x=4
y=7