Array code Numbers

Question

This is my midterm example questions. However, I don't know how to write code in bash yet properly.. Please can you help by explaining to me? This is very important to me.

Thank you

Answer 1

If I have understood your question... this should work:

$ ls /usr/bin | cut -b1 | uniq -c

please note this will count everything under /usr/bin (files, links,...)

Answer 2

这可能符合您的要求。它基本上将所有命令存储在名为“命令”的数组中。此数组已根据{{ whichItem.id1.subCategories['subCategory'] }} 进行排序。然后我们循环遍历该数组中的所有元素，并使用ls提取每个单词的第一个字母，并将其存储在一个跟踪我们正在处理的当前“字母”的变量中。随着循环继续，只要字母相同，我们继续增加计数器，否则，我们打印出字母和计数器，存储新的当前字母并将计数器重置为1（因为它已经是新字母）。最后，我们需要打印最后一条记录，从而在循环外打印。

${cmd:0:1}