In the shell script cat ＜＜ eof, error output appears

// An highlighted block
[root@haha ~]# cat test.sh
#!/bin/bash
cat << eof
*******************
test eof
*******************
eof

// An highlighted block
[root@haha ~]# sh test.sh
*******************
test eof
*******************

There is no problem in normal use;

When we use the Tab key when writing a script;

// An highlighted block
[root@haha ~]# cat test.sh
#!/bin/bash
	cat << eof
	*******************
	test eof
	*******************
	eof

// An highlighted block
[root@haha ~]# sh test.sh
test.sh: line 6: warning: here-document at line 2 delimited by en
d-of-file (wanted `eof')	*******************
	test eof
	*******************
	eof

There is an error code;

At this time, we only need to add-after <<
to solve this problem;

// An highlighted block
cat test.sh
#!/bin/bash
	cat <<-eof
	*******************
	test eof
	*******************
	eof

// An highlighted block
[root@haha ~]# sh test.sh
*******************
test eof
*******************