$ ./bash_script.sh
echo
echo "Hello World!"
comment='Welcome to W3Cschool!'
echo $comment
echo
echo "Hello World!"
comment="Welcome to W3Cschool!"
echo $comment
echo
echo "Hello World!"
remark="Hello User, $comment"
echo $remark
echo
echo "Hello World!"
remark='Hello User, $comment'
echo $remark
执行结果： $ ./bash_script.sh Hello World! Welcome to W3Cschool! Hello World! Welcome to W3Cschool! Hello World! Hello User, Welcome to W3Cschool! Hello World! Hello User, $comment
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