Crontab – Quick Reference

Setting up cron jobs in Unix, Solaris & Linux

cron is a Unix, solaris, Linux utility that allows tasks to be automatically run in the background at regular intervals by the cron daemon. 

cron meaning – There is no definitive explanation but most accepted answers is reportedly from Ken Thompson ( author of unix cron ), name cron comes from chron ,the Greek prefix for ‘time.’.
What is cron ? – Cron is a daemon which runs at the times of system boot from /etc/init.d scripts. If needed it can be stopped/started/restart using init script or with command service crond start in Linux systems.

This document covers following aspects of Unix, Linux cron jobs to help you understand and implement cronjobs successfully

  1. What is crontab?
  2. What is a cron job or cron schedule?
  3. Crontab Restrictions
  4. Crontab Commands
  5. Crontab file – syntax
  6. Crontab Example
  7. Crontab Environment
  8. Disable Email
  9. Generate log file for crontab activity
  10. Crontab file location

1. What is crontab?

Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at specified times. File location varies by operating systems, See Crontab file location at the end of this document.

2.What is a cron job or cron schedule?

Cron job or cron schedule is a specific set of execution instructions specifing day, time and command to execute. crontab can have multiple execution statments.

3. Crontab Restrictions

You can execute crontab if your name appears in the file /usr/lib/cron/cron.allow. If that file does not exist, you can use
crontab if your name does not appear in the file /usr/lib/cron/cron.deny.
If only cron.deny exists and is empty, all users can use crontab. If neither file exists, only the root user can use crontab. The allow/deny files consist of one user name per line.

4. Crontab Commands

export EDITOR=vi ;to specify a editor to open crontab file.

crontab -e    Edit crontab file, or create one if it doesn’t already exist.
crontab -l    crontab list of cronjobs , display crontab file contents.
crontab -r    Remove your crontab file.
crontab -v    Display the last time you edited your crontab file. (This option is only available on a few systems.)

5. Crontab file

Crontab syntax :
A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval.

*     *     *   *    *        command to be executed
-     -     -   -    -
|     |     |   |    |
|     |     |   |    +----- day of week (0 - 6) (Sunday=0)
|     |     |   +------- month (1 - 12)
|     |     +--------- day of        month (1 - 31)
|     +----------- hour (0 - 23)
+------------- min (0 - 59)

* in the value field above means all legal values as in braces for that column.
The value column can have a * or a list of elements separated by commas. An element is either a number in the ranges shown above or two numbers in the range separated by a hyphen (meaning an inclusive range).
A. ) Repeat pattern like /2 for every 2 minutes or /10 for every 10 minutes is not supported by all operating systems. If you try to use it and crontab complains it is probably not supported.

B.) The specification of days can be made in two fields: month day and weekday. If both are specified in an entry, they are cumulative meaning both of the entries will get executed .

6. Crontab Examples

A line in crontab file like below removes the tmp files from /home/someuser/tmp each day at 6:30 PM.

30     18     *     *     *         rm /home/someuser/tmp/*

Changing the parameter values as below will cause this command to run at different time schedule below :

min hour day/month month day/week Execution time
30 0 1 1,6,12 * — 00:30 Hrs  on 1st of Jan, June & Dec.
0 20 * 10 1-5 –8.00 PM every weekday (Mon-Fri) only in Oct.
0 0 1,10,15 * * — midnight on 1st ,10th & 15th of month
5,10 0 10 * 1 — At 12.05,12.10 every Monday & on 10th of every month

Note : If you inadvertently enter the crontab command with no argument(s), do not attempt to get out with Control-d. This removes all entries in your crontab file. Instead, exit with Control-c.

7. Crontab Environment

cron invokes the command from the user’s HOME directory with the shell, (/usr/bin/sh).
cron supplies a default environment for every shell, defining:

Users who desire to have their .profile executed must explicitly do so in the crontab entry or in a script called by the entry.

8. Disable Email

By default cron jobs sends a email to the user account executing the cronjob. If this is not needed put the following command At the end of the cron job line .

>/dev/null 2>&1

9. Generate log file

To collect the cron execution execution log in a file :

30 18 * * * rm /home/someuser/tmp/* > /home/someuser/cronlogs/clean_tmp_dir.log

10. Crontab file location

User crontab files are stored by the login names in different locations in different Unix and Linux flavors. These files are useful for backing up, viewing and restoring but should be edited only with crontab command by the users.

  • Mac OS X
  • BSD Unix
  • Solaris, HP-UX, Debian, Ubuntu
  • AIX, Red Hat Linux, CentOS, Ferdora

127 Responses to Crontab – Quick Reference

  1. jim says:

    If a cron-job has started already, can I do “crontab -e” and edit the same job and not effect the current running job? Thanks for posting!

  2. Pratyush says:

    very nice explanation for the beginners.

  3. Mark E says:

    Make jobs run at odd times, i.e. not all on the hour or half past, to even out system load.

    23 18 * * * /usr/local/bin/whotsit
    39 19 * * * /usr/local/bin/thingy

  4. PJW says:

    Thanks for that most helpful, I was looking at a crontab containing the follow

    */5 * * * * /usr/bin/wget -O /dev/null -o /dev/null http://ww

    any idea what the */5 is doing any differently than just a 5 in the minutes?

  5. zerbrak says:

    5 * * * * = ever hour day at exactly 5min past the hour
    */5 * * * * = evey 5th minute so 00:05, 00:10, 00:15 and so on

  6. Shraddha says:

    One query for crontab.
    If username is present in both files cron.allow and cron.deny then will the user be able to use crontab?

  7. 1.If cron.allow exists only users listed in it can use crontab (it applies for the root user also)

    2. If cron.allow does not exist all users except the users listed in cron.deny can use crontab

    3. If neither of the file exists, then according to site configuration for cron daemon either: only the root can use crontab, or all users can use cron

    4. If a user is listed in both cron.allow and cron.deny then the user * can * use crontab

  8. Sushant says:

    What is the meaning of
    00,15,45,0 6 * * *

  9. Siva says:

    I want to list all the jobs scheduled on a particular day. How can I do that ?

  10. Ajay says:

    Hi, How do write a crontab to run at 5.00AM and 6.30 AM everyday ?

    I’m using this currently:
    0,30 5,6 * * *
    But it’s running at 5.00AM, 5.30AM, 6.00AM and 6.30AM

    How to fix this?

  11. delefemiaoa says:

    I typed this command:
    chmod 744 /etc/crontab
    thereafter I can’t locate it again to reverse the command

  12. Sani Alhassan says:

    Hi, I have a c-program on Unix. When I run it at prompt, it works ok. When I use cron it tells me user error, invalid database. The program is to write to a raima database. Any help would be apprecaited.

    • Jim says:

      Try fully qualifying the file paths. When you run the program interactively, it uses the current directory.

      When you schedule the program in CRON, I think it only uses the path variable of the usercontext the cron job

  13. neeraj says:

    Hi, thanks for the post I have question,

    I have to run job on 3 different time i.e.

    3:05 AM , 12:30 PM and 6:15 PM How can i ?

    • Rigo says:

      you will have to use 3 lines:

      5 3 * * * cronjob
      30 12 * * * cronjob
      15 6 * * * cronjob

      I know its late, but its more for others who have similar questions.

  14. Dudoy says:

    I’m currently using Centos 5.8, I’m running a script w/c I want to execute every 10 minutes every 6AM to 11PM. I tried using:

    */10 10-23 * * * * * /bin/


    0,10,20,30,40,50 10,11,12,13,14,15,16,17,18,19,20,21,22,23 /bin/

    but both of them doesn’t work. Is Centos’ cron different from the other Linux flavors?

    How can I make this work?

    • jhoe says:

      it should be
      */10 10-23 * * * /bin/


      0,10,20,30,40,50 10,11,12,13,14,15,16,17,18,19,20,21,22,23 * * * /bin/

  15. Michael says:

    Great information. Thanks.

    One quick question though. I have a bash script that is working fine from a command line but not well when running with cron jobs.

    The scripts execute a command and assigned the output to a variable. This works fine from the command line. But when running with cron, the output of that command was not generated.

    Your thought?

  16. Zane says:


    Your first attempt was the better way. However, you have an extraneous asterisk. There are only six fields in total.

    1. min
    2. hour
    3. day of month
    4. month
    5. day of week
    6. command
    */10 10-23 * * * * * /bin/
    should be:
    */10 10-23 * * * * /bin/

  17. Thomas says:


    You should set it up like this:

    */10 10-23 * * *

    Note that there are only 5 time-values. You seem to have 7 in your code.

    // Thomas

  18. RAINER says:


    I wanna do a daily backup of one file, so I added this line to cron, but I doesn’t do the jon, if I just run the command in the terminal it works. Have you got any suggestions for me?

    0 4 * * * rsync /opt/syncserver/syncserver.db /home/Backup Images/$(date +%Y_%m_%d).db

    Thanks, Rainer

    • vmJOh40wZFZX3aMLkGXqPYyAaHGjaU2e says:

      You should put your command in a separate (ba)sh script. I think the cron command is not capable of handling ${date}…

      • LukasS says:

        Crontab handles dates just fine, you just have to remember to escape %, ie:

        Add this to your line (in the bit where it should add date to a file) `date +”\%Y-\%m-\%d”`

        “ – these behave like a running command in CLI. And it will work.

  19. Deepthi says:

    10 * * * 1-6 /opt/app/lnp/scripts/cpacRun ds05 psw_nm00sellnp 0

    Please explain cron format for this above mentioned cron

  20. victory says:

    * 1 * * * /test/qa/testscripts && ./>> /test/qa/log/cronstop.log 2>&1

    could you please tell me why we are using && in the above cron also what means 2>&1.

    THanks, Victoryhendry

    Have a nice day..

    • Hemant says:

      && provide AND functionality between two commands ; second command gets executed only if first succeeds
      2>&1 – Mean redirect standard error 2 to standard output 1 , & is used to identify 1 as file descriptor not as file name.

  21. Huw says:

    Hi, what is the best way to get the script to run between 8am and 8pm every day? Thanks.

    • JCF says:

      # Every minute between 0800 and 2000:
      * 08-20 * * * 2>&1 >/dev/null
      # Every 5 minutes between 0800 and 2000:
      */5 08-20 * * * 2>&1 >/dev/null
      # Every 20 minutes between 0800 and 2000:
      */20 08-20 * * * 2>&1 >/dev/null
      # At 10 minutes after the hour, between 0800 and 2000:
      10 08-20 * * * 2>&1 >/dev/null
      # At 15 and 45 minutes after the hour, between 0800 and 2000:
      15,45 08-20 * * * 2>&1 >/dev/null

  22. Manoj says:

    I am trying to run a Cronjob for a shell script which is basically a combination of 7 different shell scripts which is running fine when manually initiated as ” “./ & “. I am trying to run the same shell script via a cron job and I am getting kicked out after the first line of the Shell is executed.
    Can you suggest me a correct way of running a .sh script via cron. My script had a kill all process kind of first line followed by some rm -rf commands followed by a few lines of sleep commnands and then some start weblogic commands which were added as nohup ./startwe…sh & and few more sleep… and so on..

    Thanks in advance

  23. Michael says:

    The answer for almost all the requests in the comments based around “how do I make it go off at xxx and yyy” where xxx and yyy are non-standard repeating times:
    Just make 2 cron entries. You don’t necessarily have to create a pattern. Make one for 5:00 and one for 6:30 instead of trying to find a pattern between the two.

    Very good article.

  24. brinwim says: will let you try out the various crontab timing expressions interactively – before you put them live.

  25. Gyan says:

    Good one for beginners like me. Helped me understand Cron.

  26. Mage says:

    The day of the month is tricky. I can’t tell whether it is counted from 1 or 0 because I’ve never used exact numbers there, however, I can tell that */4 for day of month won’t run on 4th, 8th, 12th but will run on 1st, 5th, 9th.

  27. Marcelo says:

    Every 5 minutes is

    5,10,15,20,25,30,35,40,45,50,55 * * * *
    */5 * * * *

  28. shufil says:


    i created a bash scrip ,
    if (( $(lsof -i:3007 | wc -l) > 0 ))
    echo “$service is running!!!”
    nohup node test_app.js &

    this file running with permission 765
    And this scrip is working fine ,but its not working with cron jobs ,added crontab that is

    * * * * * cd /home/samo/Board/App && ./

    Please advice me , what is issue and how to resolve this


  29. Anil says:

    I want to set cron for one report from 8:00 BST to 18:00 BST, it should be run after each 2 hrs within 8:00BST to 18:00BST.
    Can you please help me?

  30. srikanth says:

    My cronjob is not working in one server, but the same cronjob is working in another server, why is it happening any idea.

    Please help me..

    • Jim says:

      Each version of Unix/Linux can have different cron functionality.

      Is each server on the same OS and version?

      People can only give meaningful answers if you tell the OS and version.

  31. Shakhawat says:

    I have two request.
    1.)How i can copy multiple folder by cron job, two days in a week,
    2.)How i can copy multiple folder & zip that folders in command line
    please give feedback, i’m eagerly waiting for experts respons.


    • Philan says:

      Make a script that does what you want.
      copy is not clear you want a tar
      a rsync or ???

      then use this post to make it run the days you want
      let say monday and wednsday at 8pm

      0 20 * * 1,3 your script here

  32. Ahmed says:


    i was checking crontab option and i founded this: crontab -e -u user

    minutes hours days months day_in_week /bin/echo “hello” > /tmp/file.txt

    but before that we need to change rsyslog.conf and crone.conf, or something like that in /etc folder.
    /var/log/btmp {
    create 0600 root utmp
    rotate 1

  33. Ahmed says:

    and if you need a date than you have something like:
    date +”DAte: ” %d.%m.%y. ” Time: “%H:%M
    For entering disk usage and save it to a file you can use df -h > /tmp/file.txt
    If you use variables you can use in script:
    date=`date +%d%m%Y`
    tar -cf “$name”-“$date”.tar.gz – T $list
    But if it real list with field of arguments than it goes with “read -a list”
    after that we append in arhive file tar rf “$name”-“$date”.tar.gz “${list[@]}” than we can write to user what have we done: “echo “We arhived: ${list[@]} in file $name-$date.tar.gz”

  34. Ahemd says:

    Is this ok?
    date=`date +%d%m%Y`
    echo “Enter files:”
    read -a list
    tar rf “$name”-“$date”.tar.gz “${list[@]}”
    echo “You compressed: ${list[@]} in file $name-$date.tar.gz”

  35. moontide says:

    >> RAINER Says:
    >> September 11th, 2014 at 9:43 am
    >> Hi!
    >> I wanna do a daily backup of one file, so I added this line to cron, but I doesn’t do the jon, if I just run the command in the terminal it works. Have you got any suggestions for me?
    >> 0 4 * * * rsync /opt/syncserver/syncserver.db /home/Backup Images/$(date +%Y_%m_%d).db

    The ‘%’ character need to be escaped: %

  36. Joe E says:

    This is great information for modifying the crontab, however how does one modify the cron.monthly or cron.weekly without directly editing the files in the cron.monthly or cron.weekly directories. Is there a similar crontab -e for the weekly/monthly settings. Seems like crontab -e only brings up the daily runs in my Linux system.

  37. sergio says:

    Hi i am new in crontab and i found this and need some help perhaps ytou can help me

    0 10,14,18,23 * * * /u2/UTILS/bin/

    i am not sure what exactly is doing crontab with the script i am trying to find out at what time
    or date is running

    thank you

  38. Nani says:

    00 23 */2 * *

    Looking what the above entry in crontab exactly do?

  39. Mayank says:

    Hi… How can I comment/uncomment all the schedules in crontab by a single command?


    • Pavan Sai says:

      to comment, place # symbol in the start of the line. and remove the same to uncomment.

      #* 22 * * *
      * 22 * * *

    • Glen Ragan says:

      It’s not a single command, but just like shell scripts, you can put a “#” at the front of each line to disable it.

  40. mirec says:

    Hello please can anyone help me with this kind of problem ?

    Create a crontab entry for user that creates a
    compressed version of the directory /home/user
    every Tuesday at 8.30 pm. The compressed version
    should be forwarded to the user’s home directory.

  41. bilal says:

    i want to run this script for 30 mins after every 15 mins how can i do that ??

    the below one is doing for 5 min after 1 hour. i want 30 min after 15 mins break

    0 * * * * nohup /home/pi/mmal/motion -n -c /home/pi/mmal/motion-mmalcam.conf 1>/dev/null 2>&1 </dev/null &

    5 * * * * pkill -9 motion

  42. Aung Naing says:

    How to reboot everyday at 12:00AM

    • Philan says:

      0 0 * * * shutdown -r now

      Note This is not a good Idea
      You normaly dont need to reboot
      Linux like this. Some of my server
      have over 2years uptime.

  43. Dushyant says:

    When I open crontab a popup blocks part of the contents.
    1. How do I join as a user and contributor “Admin’s Choice” ?
    2, How can I get rid of pop-ups in the contents?

  44. Rahul Mehetar says:


    Add 0 24 * * * /sbin/reboot “everyday at 12 AM”

  45. Rex says:

    What kind of email?? may I set it to a certain email address to inform my executin result?

  46. Glen Ragan says:

    To all who are saying, “this works as a command but not from crontab”: the cron server may not start the same shell (bash, tcsh, etc.) as your interactive prompt, and may not have the same environment. To check the shell, intall a crontab file of:
    * * * * * echo $0

    This will e-mail to you (every minute!) the shell that is processing your cron commands. Similarly,
    * * * * * env

    will e-mail to you (every minute!) the environment that your cron command runs in; you can compare that to the result of “env” in your interactive prompt to find differences.

  47. Deon says:

    Hi Everyone, thanks for all the info you all gave, it helps a lot.

    When i create a cronjob, can I give each job a heading and will it not screw around?
    I am too scared to test.

    like for example

    —This Is to take my medicine—
    30 18 * * * rm /home/someuser/tmp/*
    —This is to take some other stuff—
    30 21 * * * rm /home/someuser/tmp/*

    • Philan says:

      # This Is to take my medicine
      30 18 * * * rm /home/someuser/tmp/*
      # This is to take some other stuff—
      30 21 * * * rm /home/someuser/tmp/*

      Note this is a good idea to comment your lines
      so when you look at it in 3 years from now you
      will know what the cron does.

  48. […] are plenty of detailed examples on how crontab works on the internet such as this at which will explain the format of the above crontab […]

  49. […] execute the script on a schedule, in this case daily, crontab is used. To configure crontab on the vMA edit crontab for vi-admin, sudo crontab -u vi-admin -e. […]

  50. Dan says:

    How do I set up a daily cron that deletes only files older than 15 days?

  51. […] You may learn more about customize cron in Admin’s Choice’s “Crontab – Quick Reference”. […]

  52. […] 4. Schedule a cron job to execute the scriptWith our load script installed, and having confirmed its successful operation, we want to schedule regular execution. There are many different tools available for this, but a simple means of achieving this, on a Linux system, is cron. […]

  53. […] order for the following code to run regularly, you need to have access to crontab and schedule the code to run weekly or daily, depending on your […]

  54. […] to have to log in to the machine and then manually issue that command every day. So let’s use crontab to add a cron job an run a script to do that every weekday at 8 PM. The utility crontab can be run […]

  55. Doug Strickland says:

    Is there a way to use cron to start a python script every time the device reboots?

  56. Mariam says:

    I want to command that runs every second saturday of the month, How do I do that

  57. […] schedule by choosing this option (the units is minutes, hours, and days). Second form is by using cron expression, we can use cron expression as usual as we use it on the -nix-family ( crontab -e […]

  58. […] the .sh file everyday at 10:00 pm daily. To understand complete format of this command you can read here. Now the question is what is .sh file and what does it contain and how does it run python file […]

  59. […] is a great guide on crontab here if you are looking to learn more or change the times to schedule your […]

  60. s says:

    If I set cron using “crontab -e” which will run in every 10 mins and saved. This cron will get executed after 10 mins . But there is requirement that cron shouldd run when I set it and then follow time as mentioned in cron. is it possible to do that?

  61. […] script is run from cron, meaning that each user should have a crontab with an entry like this […]

  62. […] the 59 * * * *  means that this script will run every 59 minutes. If you need more info on Cron you can visit this page. […]

  63. Rajesh says:

    I want to execute my cron job on every second Sunday of each month. Please tell me command to create cron job to run on every second sunday of each month.

    With Regards,

  64. […] the */2 * * * *  means that this script will run every 2 minutes. If you need more info on Cron you can visit this page. […]

  65. RainyKiwi says:

    Hi there, I have a Linksys router running OpenWRT and want to create a cron that shuts down its LAN interface at a certain time, say 9pm, then enables the LAN interface at another time, say 6am. Does anyone know how to do that on this router? It has a ‘scheduled tasks’ tab and there’s already one job in there: */5 * * * * /sbin/

  66. […] will run podget at 4am every day. The -s at the end is to run podget in silent mode. See the crontab quick reference guide for more information on how to […]

  67. […] Idea 3: set a cronjob to run it! In case you don’t know, cron jobs are the schedulers on linux. Run crontab -e to edit the jobs, and crontab -l to view what jobs you have scheduled. To understand the syntax of the crontabs, see this. […]

  68. […] Idea 3: set a cronjob to run it! In case you don’t know, cron jobs are the schedulers on linux. Run crontab -e to edit the jobs, and crontab -l to view what jobs you have scheduled. To understand the syntax of the crontabs, see this. […]

  69. Naveed says:

    I want to run command which will execute every 1 minute but not more than 10 minutes of any one hour

  70. Naveed says:

    I am using */1,2,3,4,5 12 * * *

  71. […] you are new to contab, please look at this link. Basically, to define it, I use “crontab -e” command line in the Terminal to […]

  72. […] vous ne connaissez rien aux crons, vous pouvez consulter ce site. On définit un cron de la manière suivante: on tape « crontab -e » en ligne de commande dans […]

  73. Norman Grey says:

    According to the article: By default cron jobs sends a email to the user account executing the cronjob.

    I am running Ubuntu 16.04.3 LTS on the cloud and I never get an email from cron, or any other notification that I can detect. I’d actually like to get emails and/or notifications about cron jobs failing or succeeding. How can I enable cron emails and/or notifications?

  74. […] Crontab Quick Reference – Admin’s Choice […]

  75. […] For more information on Cron see the useful quick reference guide here [2]. […]

  76. […] Send Email when IP Address Changes. [2] Bash – Dynamic Public IP Address Monitor Script. [3] Crontab – Quick Reference. [4] How to write a script to detect and notify of an IP address […]

  77. […] There’s a cli interpreter called php. Run your script through that as a cron job. […]

  78. […] the instructions to install DashCentral push script on the same server as my Dash node. It’s a crontab job that runs a perl script. I’ve excluded these pretty boring […]

  79. […] 点运行这条命令。您可以选择 dow 或是 dom(比如,每月 5 号)等。您可以在 这里 […]

  80. […] yazıyı şuradaki  yazıdan çoğunluğunu çevirerek yazdım. Güzel anlatmış orada, türkçesi de olsun istedim. […]

  81. mohan says:

    how to write a cron …starting time is 2:30 PM and it should be run in every 2 hrs like 4:30 ,6:30 ,8:30..

    • Saravanan B says:

      Please run it like below.
      30 14,16,18,20,22,00 * * * command to execute. This will run from 2:30 PM to mid night 12:30 AM (Unix box time) on all days. After this you tell me whether it works as expected or not.


  82. […] 你就會看到之前輸入的程式碼。骯髒碗盤偵測器正在自動偵測水槽乾淨與否!Crontab祕訣:Admin’s Choice會簡易拆解Crontabs的解譯,我建議把資料輸入這個Crontab產生器,有助於瞭解Crontab如何產生,每個部分各有什麼意義。 結論先前介紹時就有提到,光線不足時偵測器就會失靈。假如有人半夜把髒碗盤堆在水槽,偵測器就無法發現,除非等到周圍環境變明亮。有一個辦法就是把人體紅外線感應器安裝在部分光源上。這光線不用太亮,但必須夠直接,其他工作就交給偵測器完成。這種干擾因素很好解決,只要結合其他專題加以應用即可。你還有其他骯髒碗盤偵測器的點子嗎?你的保護殼可能會有不同的設計,或者改用其他容器來融入廚房環境。我等不及聽到你的分享。此外,骯髒碗盤偵測器也可能變成偵探。搞不好可以偷偷藏在暗處,稍微調整軟體就可以抓到圖謀不軌的人。如果你想到其他擴充軟體的點子,或者有趣的解決方案,麻煩讓我們知道。我參考過下列部落格和網站,特別感謝他們的建議:Linux Wireless Wiki,WikiDevi有關WNA1000M無線轉換器的資料,AskUbuntu論壇,Ayoub Zaki的嵌入式系統部落格、BeagleBone Notes、DLF。我還要特別感謝德瑞克‧莫洛伊(Derek Molloy),他有關BeagleBone Black的資料很豐富,雖然我沒有採用他的步驟,卻很感謝他提供完整的資料。 Jason Kridner傑森‧克里德納是名德州儀器(Texas Instruments)的資深員工,也是非營利基金會BeagleBoard.org的共同創辦人,致力於推廣嵌入式電腦的設計和開放軟硬體的應用。 Nick Normal尼克‧諾莫是名來自紐約皇后區的藝術家和自造達人,也是藏書狂。在流動工廠(Flux Factory)藝文空間曾有5年的駐村經驗,是紐約市World Maker Faire的共同主辦人,致立於推廣宅拉松(geekathon)的一切相關事物。 [原文]譯:林冠妤、謝明珊 […]

  83. […] operate the unit tests on the crew prior to pushing codes into production. Though you can use crontab to operate automatic tests, I would propose working with some thing additional professional […]

  84. […] operate the device checks on the crew ahead of pushing codes into output. While you can use crontab to operate automatic checks, I would propose working with some thing extra specialist like Travis […]

  85. […] order for the following code to run regularly, you need to have access to crontab and schedule the code to run weekly or daily, depending on your […]

  86. […] Now you will be in the edit screen of the crontab. Press i to commence your edit. If you're not sure how to input the values for a cron job they are broken into 5 segments of time. They are: minute, hour, day of the month, month, day of the week. You can read more about cron settings here… […]

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