diff --git a/shell/shell变量提取赋值.md b/shell/shell变量提取赋值.md
index fce489f..cab2d49 100644
--- a/shell/shell变量提取赋值.md
+++ b/shell/shell变量提取赋值.md
@@ -3,5 +3,4 @@
 |${var:-aa}|若var为空或未设定, 返回aa, var值不变|
 |${var:=aa}|若var为空或未设定, 返回aa, var=aa|
 |${var:+aa}|若var有值 返回aa, var值不变|
-|${var:?aa}|若var为空或未设定 返回aa并退出shell, 若aa无值, 则输出parameter null or not set, 用于检测var是否被正确赋值|
-|-|-|
\ No newline at end of file
+|${var:?aa}|若var为空或未设定 返回aa并退出shell, 若aa无值, 则输出parameter null or not set, 用于检测var是否被正确赋值|
\ No newline at end of file