这段代码是什么意思？

jasonwang

if "%1" == "c" goto _cmd_c
if "%1" == "C" goto _cmd_c
if "%1" == "t" goto _cmd_t
if "%1" == "T" goto _cmd_t
if "%1" == "x" goto _cmd_x
if "%1" == "X" goto _cmd_x
if "%1" == "f" goto _cmd_f
if "%1" == "F" goto _cmd_f
if "%1" == "m" goto _cmd_m
if "%1" == "M" goto _cmd_m
if "%1" == "b" goto _cmd_b
if "%1" == "B" goto _cmd_b
if "%1" == "d" goto _cmd_d
if "%1" == "D" goto _cmd_d
if "%1" == "i" goto _cmd_i
if "%1" == "I" goto _cmd_i
if "%1" == "it" goto _cmd_it
if "%1" == "IT" goto _cmd_it

longlang

根据调用参数中第一个参数的内容跳转到不同的段

jasonwang

%1 是个什么呢？