【586】Terminal 使用 for 语句

参考：How to search for all the files starting with the name “ABC” in a directory?

参考：Terminal Commands: For loop with echo

---

• 使用变量的时候需要 ${i} 这样包围住

• {01..10}, {1..10} 是不一样，前者默认前面都加 0，真是方便，随意

　　基本语法：

for i in ...; do ...; done

or 

for i in ...
do ...
done

　　输出连续数字举例：

for i in {0..10}; do echo ${i}; done
0
1
2
3
4
5
6
7
8
9
10

　　or

for i in {0..10}
do echo ${i}
done
0
1
2
3
4
5
6
7
8
9
10

　　批量创建空文件举例：

for i in {01..10}; do touch text_${i}.txt; done

# 生成文件

text_01.txt
text_02.txt
text_03.txt
text_04.txt
text_05.txt
text_06.txt
text_07.txt
text_08.txt
text_09.txt
text_10.txt

　　批量修改文件名称举例：

for f in $(ls); do mv ${f} alex_${f}; done

# 生成文件

alex_text_01.txt
alex_text_02.txt
alex_text_03.txt
alex_text_04.txt
alex_text_05.txt
alex_text_06.txt
alex_text_07.txt
alex_text_08.txt
alex_text_09.txt
alex_text_10.txt