Bash中$#的用途是什么

本文介绍了Bash中$#的用途是什么的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我对Bash脚本非常陌生，有人可以向我解释$#和$的情况吗?在以下代码中工作?

I am very new to Bash scripting, can someone explain to me how the $# and $? work in the following code?

#!/bin/bash ARGS=3 # Script requires 3 arguments. E_BADARGS=85 # Wrong number of arguments passed to script. if [ $# -ne "$ARGS" ] then echo "Usage: `basename $0` old-pattern new-pattern filename" exit $E_BADARGS fi old_pattern=$1 new_pattern=$2 if [ -f "$3" ] then file_name=$3 else echo "File \"$3\" does not exist." exit $E_BADARGS fi exit $?

推荐答案

来自在Y分钟内学习Bash # Builtin variables: # There are some useful builtin variables, like echo "Last program's return value: $?" echo "Script's PID: $$" echo "Number of arguments passed to script: $#" echo "All arguments passed to script: $@" echo "The script's name: $0" echo "Script's arguments separated into different variables: $1 $2..."