How to avoid file overwriting under CentOS

This article mainly shows you "how to avoid file coverage under CentOS", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to avoid file coverage under CentOS" this article.

Examples are as follows

[root@stu227 he] # touch he.txt

[root@stu227 he] # set-o noclobber

[root@stu227 he] # echo "123" > he.txt

Bash: he.txt: cannot overwrite existing file

If you want to remove the restriction, change set-o to set + o

[root@stu227 he] # set + o noclobber

[root@stu227 he] # echo "123" > he.txt

[root@stu227 he] # cat he.txt

one hundred and twenty three

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