呼唤远方
变量以双引号字符串扩展,但不在单引号字符串中扩展:$name=World
$echo"Hello$name"
HelloWorld
$echo'Hello$name'
Hello$name如果您只需切换引号,请执行此操作。如果您更喜欢使用单引号来避免额外的转义,则可以在同一参数中混合和匹配引号:$echo'singlequoted.'"Doublequoted."'Singlequotedagain.'
singlequoted.Doublequoted.Singlequotedagain.
$echo'"$name"hasthevalue'"$name"
"$name"hasthevalueWorld适用于您的案例:echo'testtext"here_is_some_test_text_'"$counter"'""output"'>>"$FILE"