linux下避免文件覆盖的命令

[[email protected] he]# touch he.txt
[[email protected] he]# set -o noclobber
[[email protected] he]# echo "123" > he.txt

bash: he.txt: cannot overwrite existing file

如果要取消限制，就把set -o 改为set +o

[[email protected] he]# set +o noclobber
[[email protected] he]# echo "123" > he.txt
[root[email protected] he]# cat he.txt
123