Shell pre-defined functions for Linux

$ $1-n The name of the current shell script the position variable $ #参数的数量 $* the value of all positional variables #? To determine whether the previous command succeeded, 0 for success, The non-0 is the failure----------------------------------------------------------------------------#位置参数跟在脚本的后面列如test. SH $ ... #! /bin/bashecho "The current script name is $ $" echo "the first parameter is $ $, and the fifth is $ A." "Echo" has a total of $ #个参数, respectively, $*. "

　　

Shell pre-defined functions for Linux