Asked  7 Months ago    Answers:  5   Viewed   31 times

I'm trying to get cron to call in the correct PATHs. When I run a Python script from shell the script runs fine as it uses the PATHs set in bashrc but when I use cron all the PATHs are not used from bashrc. Is there a file I can enter the PATHs into for cron like bashrc or a way to call the PATHs from bashrc?

Sorry I don't think I worded this correctly, I can get the correct script to run (meaning the PATH to the script in crontab is not the problem here), it's just when that script is running I run a build and this uses the PATHs set in .bashrc. When I run the script when I'm logged in, the .bashrc PATHs are pulled in. Since cron doesn't run in a shell per say it does not pull in .bashrc. Is there a way of pulling this in without having to write a bash script wrapper?

 Answers

25

I used /etc/crontab. I used vi and entered in the PATHs I needed into this file and ran it as root. The normal crontab overwrites PATHs that you have set up. A good tutorial on how to do this.

The systemwide cron file looks like this:

This has the username field, as used by /etc/crontab.
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file.
# This file also has a username field, that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user   command
42 6 * * *   root    run-parts --report /etc/cron.daily
47 6 * * 7   root    run-parts --report /etc/cron.weekly
52 6 1 * *   root    run-parts --report /etc/cron.monthly
01 01 * * 1-5 root python /path/to/file.py
Tuesday, June 1, 2021
 
revive
answered 7 Months ago
83

With one cron line, no. With three, yes:

# Every 15 minutes except for 3:00-3:59
*/15 0-2,4-23 * * * thejob
# 3:15, 3:30, 3:45
15-45/15 3 * * * thejob
# 3:00 dead
0 3 * * * otherjob
Saturday, July 17, 2021
 
Ultimater
answered 5 Months ago
44

Oops. Guess I found the "why" or at least, the "how" :

Only renaming the job filename without ".sh" extension solved that issue.

I thought it was a Debian's bug but it isn't, as described in the other answers below.

SOLUTION: rename your script by removing all . or + characters from its name

Thursday, July 29, 2021
 
Sauleil
answered 5 Months ago
11

There is no way to do this without making some changes either to the function's name or location. If you check Matlab's function precedence order, methods always run before normal external functions. Your only practical options are:

  1. Change the function's name.
  2. Move the function's body to the same script that is calling the function (item 4 on the list above)
  3. Move the function's .m file to a folder called private in the same folder as your script file (item 5 on the list)

UPDATE

Although not quite practical for smaller projects, you may also want to look into packaging your functions. A good discussion can be found in this SO post.

Thursday, August 5, 2021
 
Kumar112
answered 4 Months ago
84

An option would be to have the Abstract class do the calling in this manner. Otherwise, there is no way in c# to require an inherited class to implement a method in a certain way.

public abstract class AbstractClass
{
    public void PerformThisFunction()
    {
        MustBeCalled();
        AbstractMethod();
    }

    public void MustBeCalled()
    {
        //this must be called when AbstractMethod is invoked
    }

    //could also be public if desired
    protected abstract void AbstractMethod();
}

public class ImplementClass : AbstractClass
{
    protected override void AbstractMethod()
    {
        //when called, base.MustBeCalled() must be called.
        //how can i enforce this?
    }
}

Doing this creates the desired public facing method in the abstract class, giving the abstract class over how and in what order things are called, while still allowing the concrete class to provide needed functionality.

Sunday, August 22, 2021
 
nika
answered 4 Months ago
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