Execute Python script via crontab

Question

I m trying to execute a Python script using the Linux crontab  I want to run this script every 10 minutes  I found a lot of solutions and none of them worked  For example  edit the anacron at  etc cron d or use crontab -e  I put this line at the end of the file  but it doesn t change anything  Do I have to restart any service s     2          usr bin python  home souza Documets Listener listener py  What file must I edit to configure this   Here is the script     usr bin python   - - coding  iso-8859-15 - -  import json import os import pycurl import sys import cStringIO  if   name       quot   main   quot        name server standart    quot Server created by script  d quot      json file standart    quot     quot server  quot         quot name  quot      quot  s  quot     quot imageRef  quot      quot  s  quot     quot flavorRef  quot      quot  s  quot      quot       curl auth token   pycurl Curl        gettoken   cStringIO StringIO        curl auth token setopt pycurl URL   quot http   192 168 100 241 8774 v1 1 quot       curl auth token setopt pycurl POST  1      curl auth token setopt pycurl HTTPHEADER    quot X-Auth-User  cpca quot                              quot X-Auth-Key  438ac2d9-689f-4c50-9d00-c2883cfd38d0 quot         curl auth token setopt pycurl HEADERFUNCTION  gettoken write      curl auth token perform       chg   gettoken getvalue        auth token   chg chg find  quot X-Auth-Token   quot   len  quot X-Auth-Token   quot     chg find  quot X-Server-Management-Url  quot  -1       token    quot X-Auth-Token   0  quot  format auth token      curl auth token close         ----------------------------      getter   cStringIO StringIO       curl hab image   pycurl Curl       curl hab image setopt pycurl URL   quot http   192 168 100 241 8774 v1 1 nuvemcpca images 7 quot       curl hab image setopt pycurl HTTPGET  1   tirei essa linha e funcionou  nao sei porque     curl hab image setopt pycurl HTTPHEADER   token        curl hab image setopt pycurl WRITEFUNCTION  getter write       curl list setopt pycurl VERBOSE  1      curl hab image perform       curl hab image close        getter   cStringIO StringIO        curl list   pycurl Curl       curl list setopt pycurl URL   quot http   192 168 100 241 8774 v1 1 nuvemcpca servers detail quot       curl list setopt pycurl HTTPGET  1   tirei essa linha e funcionou  nao sei porque     curl list setopt pycurl HTTPHEADER   token        curl list setopt pycurl WRITEFUNCTION  getter write       curl list setopt pycurl VERBOSE  1      curl list perform       curl list close         ----------------------------      resp   getter getvalue        con   int resp count  quot status quot         s   json loads resp       lst           for i in range con           lst append s  servers   i   status         for j in range len lst            actual   lst pop           print actual          if actual     quot ACTIVE quot  and actual     quot BUILD quot  and actual     quot REBOOT quot  and actual     quot RESIZE quot                print  quot Entra no If quot               f   file  counter    r w                num   0             for line in f                  num   line              content   int num  1              ins   str content               f seek 0              f write ins              f truncate               f close                print  quot Contador quot               json file   file  json file create server json   r w                name server final   name server standart   content             path to image    quot http   192 168 100 241 8774 v1 1 nuvemcpca images 7 quot              path to flavor    quot http   192 168 100 241 8774 v1 1 nuvemcpca flavors 1 quot               new json file content   json file standart    name server final  path to image  path to flavor               json file seek 0              json file write new json file content              json file truncate               json file close                print  quot Json File quot               fil   file  quot json file create server json quot               siz   os path getsize  quot json file create server json quot                cont size    quot Content-Length   d quot    siz             cont type    quot Content-Type  application json quot              accept    quot Accept  application json quot               c create servers   pycurl Curl                logger   cStringIO StringIO                c create servers setopt pycurl URL   quot http   192 168 100 241 8774 v1 1 nuvemcpca servers quot                c create servers setopt pycurl HTTPHEADER   token  cont type  accept  cont size                c create servers setopt pycurl POST  1               c create servers setopt pycurl INFILE  fil               c create servers setopt pycurl INFILESIZE  siz               c create servers setopt pycurl WRITEFUNCTION  logger write               print  quot Teste perform quot               c create servers perform                print logger getvalue                c create servers close

User · Accepted Answer

Just use crontab -e and follow the tutorial here   Look at point 3 for a guide on how to specify the frequency   Based on your requirement  it should effectively be     10          usr bin python script py

User · Answer

Put your script in a file foo py starting with    usr bin python  Then give execute permission to that script using chmod a x foo py  and use the full path of your foo py file in your crontab  See documentation of execve 2  which is handling the shebang

User · Answer

As you have mentioned it doesn t change anything  First  you should redirect both standard input and standard error from the crontab execution like below    2          usr bin python  home souza Documets Listener listener py  gt   tmp listener log 2 gt  amp 1  Then you can view the file  tmp listener log to see if the script executed as you expected  Second  I guess what you mean by change anything is by watching the files created by your program  f   file  counter    r w   json file   file  json file create server json    r w    The crontab job above won t create these file in directory  home souza Documets Listener  as the cron job is not executed in this directory  and you use relative path in the program  So to create this file in directory  home souza Documets Listener  the following cron job will do the trick    2         cd  home souza Documets Listener  amp  amp   usr bin python listener py  gt   tmp listener log 2 gt  amp 1  Change to the working directory and execute the script from there  and then you can view the files created in place

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