-eq 等于,如:if [“
a
"
−
e
q
"
a" -eq "
a"−eq"b” ]
-ne 不等于,如:if [“
a
"
−
n
e
"
a" -ne "
a"−ne"b” ]
-gt 大于,如:if [“
a
"
−
g
t
"
a" -gt "
a"−gt"b” ]
-ge 大于等于,如:if [“
a
"
−
g
e
"
a" -ge "
a"−ge"b” ]
-lt 小于,如:if [“
a
"
−
l
t
"
a" -lt "
a"−lt"b” ]
-le 小于等于,如:if [“
a
"
−
l
e
"
a" -le "
a"−le"b” ]
< 小于(需要双括号),如:((“
a
"
<
"
a" < "
a"<"b”))
<= 小于等于(需要双括号),如:((“
a
"
<
=
"
a" <= "
a"<="b”))
大于(需要双括号),如:((“ a " > " a" > " a">"b”))
= 大于等于(需要双括号),如:((“ a " > = " a" >= " a">="b”))
另外：$?是shell变量,表示"最后一次执行命令"的退出状态.0为成功,非0为失败.
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