Linux does not delete files, empty the contents of the file command _linux

At some point, the contents of the file need to be emptied without deleting the file. Analogy some log files (log.txt); the commands under Linux are:true >log.txt

Test results:

Touch Log.txt → #新建文件log. txt

VI log.txt → #编辑 file

Whatever you want to enter.

: wq! return → #保存退出;

Cat Log.txt → #查看 The contents of the document;

true >log.txt → #查看 the contents of the document;

Report:

Rm-r Delete directories, regardless of whether there are files in the directory

RM-RF forced deletion, no hint

Generally used in these two, delete files can be used rm-f, the same is forced to delete

RM-RF File Man RM also has the option of using/etc/null, which is also equivalent to the Recycle Bin in Windows!

CAT/ETC/PASSWD |cut-f 1-d: View all Users

SU Switch User

Userdel Delete User Name

AddUser username New User

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