Ubuntu crontab timed Python

Tag: Log txt Color success space timed to execute test ACK span

Ubuntu system, timed to execute Python script.

Purpose: Perform timer_test.py once per minute

timer_test.py Path/home/li/d/pythonwork/test/timer_test.py

1 # Coding:utf-8 2 Import  Time 3 t = time.strftime ('%y-%m-%d%h:%m:%s', Time.localtime (Time.time ()))  4' execution time:'\ n'5 Print str

Start Set timing

1 opening the terminal on the desktop

2 Input: sudo crontab-e

Then enter: */1 * * * * python/home/li/d/pythonwork/test/timer_test.py >>/home/li/d/pythonwork/test/testcrontab.log 2 >&1

or enter the absolute path of Python: */1 * * * *, usr/bin/python2.7/home/li/d/pythonwork/test/timer_test.py >>/home/li/d/pythonwor K/test/testcrontab.log 2>&1

Press CTRL o Save → If prompted, press ENTER directly →ctrl X to leave

As follows

3 input: sudo crontab-l to see your edited files.

4 This is the go to/home/li/d/pythonwork/test/path below you can see the Testcrontab.log file, open as follows:

The timing is set successfully.

----------------------------------------------------------------------------

Other:

In Testcrontab.log, the latter 2>&1 means outputting the wrong output to the standard output (2 means the error,2> means the error output,& equals, 1 is correct), Therefore, if you run an error, you will output the error to the previously defined log.

Here's a little explanation of the meaning of each line in crontab. Each row in crontab represents a task that is performed on a regular basis and is divided into 6 parts. The first 5 sections indicate when to execute the command, and the last part represents the command to execute. Each part is separated by a space, except that the last part (the command) can use a space inside it, and no space in the other part. The first 5 sections represent: minutes, hours, days, months, and weeks, with the following values for each part:

Minutes 0-59

Hours 0-23

Day 1-31

Month 1-12

Week 0-6 0 indicates Sunday

In addition to these fixed values, you can also match the asterisk (*), comma (,), and slash (/) to indicate some other meanings:

Asterisks indicate any value, such as filling in the hour section * for any hour (per hour)

Commas can allow multiple values to be filled in a section, such as filling in minutes with 1,3 for one minute or three minutes

The slash general mate * is used, representing how often, for example in the hour section fill in the */2 representative every two minutes. So there's no difference between */1 and *

*/2 can be considered as any value that can be divisible by 2.

    * * * * *                  #  perform a task    every other minute    0        *                  * * * #  0 points per hour to perform a task, such as    6:00,10:00    6,10     *    2 *    *                  #  2nd every month, 6 minutes and 10 minutes    per hour.    */3,*/5 * * * * *                  #  Perform tasks every 3 minutes or 5 minutes, such as 10:03,10:05,10:06  

0 7 * * */BIN/LS#/bin/ls every morning at 7.0 6-12/3 */usr/bin/backup#during the December, every 3 hours in the morning from 6 to 12./usr/bin/backup0 * * 1-5 mail-s"Hi"[Email protected] </tmp/maildata#Monday to Friday every 5:00 send a letter to [email protected]0-23/2 * * * echo"haha">>/tmp/haha.txt#every day of the month 0:20 midnight, 2:20, 4:20 .... Write haha to the/tmp/haha.txt file

Reference:

How to use Ubuntu under Crontab commands

Use of Scheduled Tasks under Ubuntu (crontab)

Ubuntu crontab timed Python