expr中文什么意思

表达式

命令中

• expression (expr):    表式,冻式,表自
• expression (ex)(expr):    表式
• regional expr elder brother:    阿哥

例句与用法

1. The left - shift operator shifts its first operand left by the number of bits specified by its second operand . expr count
   左移位运算符( < < )根据第二个操作数指定的位数将第一个操作数向左移位。
2. Self - dicipline will teach you to therow your willpower behind either reson or emotion and amplify the intesity of their expr ion
   自律会教导你的意志力作为理性和情绪的后盾，并强化二者的表现强度。
3. The unsigned right - shift operator shifts its first operand right by the number of bits specified by its second operand . expr count
   无符号的右移位运算符( > > > )将第一个操作数向右移动第二个操作数指定的位数。
4. The successful construction of pcusaib4 and pcusaib ^ vector is the key foundation of si gene expr essed in maize
   Ibvs1基因玉米高效表达载体的成功构建将为进一步进行ibvs1基因在玉米中的表达和免疫保护性研究打下了基础。

百科释义

expr is a command line Unix utility which evaluates an expression and outputs the corresponding value. It first appeared in Unix v7 as a standalone program, and was later incorporated into the shell as a built-in command.