[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 cancel 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
123
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