Detailed explanation of mktemp, a basic Linux command

mktemp

Create temporary files or directories in a safe way. Applicable scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

1. Grammar

mktemp [options] [TEMPLATE]

2. List of options

3. Examples

1) Create a temporary file

[root@localhost weijie]# mktemp wj123.XXXX //The name contains 4 Xs
wj123.kpET
You have new mail in /var/spool/mail/root
[root@localhost weijie]# mktemp wj123.XXXXXX //The name contains 6 Xs
wj123.oH2o4P
[root@localhost weijie]# ls
1.c wj123.kpET wj123.oH2o4P

2) Create a temporary directory

[root@localhost weijie]# mktemp -d wjtp //There is no X in the name

mktemp: too few Xs in template "wjtp"

[root@localhost weijie]# mktemp -d wjtpxxx //There is no X in the name. Here you can see that X must be uppercase. mktemp: Too few Xs in template "wjtpxxx" [root@localhost weijie]# mktemp -d wjtpXXX //Created successfully wjtpflR
 [root@localhost weijie]# ls -l

Total dosage 4

-rw-r--r-- 1 root root 0 Sep 7 09:11 1.c
-rw------ 1 root root 0 September 7 14:47 wj123.kpET
-rw------ 1 root root 0 Sep 7 14:47 wj123.oH2o4P
drwx------ 2 root root 4096 September 7 14:50 wjtpflR

3) Create a temporary file in /tmp

[root@localhost weijie]# mktemp --tmpdir wj234.XXX //tmpdir does not specify a path, create /tmp/wj234.BNy under tmp
You have new mail in /var/spool/mail/root

4) Create a temporary directory in the specified directory

[root@localhost weijie]# mktemp --tmpdir=/weijie wj234.XXX //Create /weijie/wj234.q1C in the path specified by tmpdir
[root@localhost weijie]# ls
1.c wj123.kpET wj123.oH2o4P wj234.q1C wjtpflR

5) Create using option -u

[root@localhost weijie]# mktemp -u wj123.XXXXXX //Use the -u option wj123.dSgIKl
[root@localhost weijie]#ls //Cannot see the temporary file because it is not created 1.c wj123.kpET wj123.oH2o4P wj234.q1C wjtpflR

Supplement: Linux basic commands

1. Basic commands

1. ls: List files or directories in the current directory

2. ls -a: List all files and directories in the current directory (including hidden files)

3. ls -l: Display detailed information of the file (long format information view), equivalent to ll

ls -hl: Display detailed information and file size of the file
ls -al: List detailed information of all files and directories in the current directory
ls -dl: Display detailed information about the current file itself

4. cat command: view file information (can only view files)

[root@com ~]# cat /etc/passwd: View all user information
[root@com ~]# cat /etc/group: View all user group information

Note: Every time a user is created in the Linux system, a corresponding user group will be automatically generated.

5. cd command: switch directory

 [root@com ~]# cd /etc: Switch to the etc directory under the root directory pwd: Display the directory of the current file whoami: View the current user [root@com etc]# whoami: View the current user is root user root

6. /: indicates the user's root directory

Home directory (host directory)

1) Home directory of the administrator user:

  [root@com ~]# pwd
    /root

2) Home directory of ordinary users:

[java17@com ~]$ pwd
    /home/java17

7. Switch user command: su - username

1) Switch to a normal user

  [root@com ~]# su - java17
  [java17@com ~]$ pwd
  /home/java17

2) Switch to the root administrator user

 [java17@com ~]$ su - or [java17@com ~]$ su - root
  Password:

8. Shutdown, restart, clear screen

Shutdown: halt, init 0, shutdown now
Restart: reboot, init6
Clear screen: clear, Ctrl+l

Summarize

The above is a detailed explanation of mktemp, a basic Linux command, introduced by the editor. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!