Shell Programming and Scripting

case "$test" in
/^0/) echo "starting with zero ;;
/^1/) echo " with one" ;;
*) echo "otherwise"
esac

echo $test | awk '
/^0/ { print "starting with zero" }
/^1/ { print "with 1" }
'

echo $test | awk '{
if (/^0/){
  print "YES"}
else {
  print "NO"}
}'

echo $test | awk '{
if (!/^0/&&!/^1/){
  print "Both not matches"}
else {
  print "Starting with 0 or with 1"}
}'

case "$test" in
  0*) echo "starting with zero ;;
  1*) echo " with one" ;;
  *) echo "otherwise";;  # note closing double semicolon here too
esac

echo $test | awk '
/^0/ { print "starting with zero" }
/^1/ { print "with 1" }
/^[01]/ { print "neither" }
{ print "any of the above" }'