How shell uses for or while loops

This article will explain in detail how shell uses for or while loops. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

For/while cycle

For ((iTun0; I < 10; iTunes +)); do echo $i; donefor line in $(cat a.txt); do echo $line; donefor f in * .txt; do echo $f; donewhile read line; do echo $line; done < a.txtcat a.txt | which 1.rm commands are commonly used in while read line; do echo $line; doneshell to delete files; 2.echo refers to the display of specified text; 3.cat file name, output file contents to basic output; 4.cb, formatting source code 5.date, current time and date

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