Solution to CentOS file overwriting problem

[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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