Shell脚本＆＃34; current_id：命令未找到＆＃34;错误

Question

当我运行我的脚本时：

#!/usr/bin/env bash

read NUM

case $NUM in
    1)
        current_id = "$$"
        ps -ef > file1.txt

        echo "$current_id"
        while [ $current_id -ne 1 ]
        do 
            current_id =$( cat file1.txt | awk '(if ( $s == '$current_id' ) print $3;)')
            echo " | "
            echo " v "
            echo $current_id
        done

        echo "";;

我收到错误：

current_id: command not found

[: -ne: unary operator expected

我正在尝试使用此方法查找子父树。我的语法有问题吗？或者是current_id =＆＃34; $$＆＃34;不允许？谢谢你的帮助。

Answer 1

在作业中，=

之前不得有空格

current_id =$(...)   # tries to run a program called current_id, which does not exist
current_id=$(...)    # assigns a value to variable