Linux Cronjob 未运行 powershell 脚本，但该脚本能够在终端中运行

Question

I have a PowerShell Script that updates a database table. I would like to set this up in the Cronjob to run daily. However it doesnt seem to work in the cronjob. At the moment I have setting it forward a couple minutes so that I dont have to wait.

CronTab:

* * * * * pswh -File "/home/administrator/PowerShellScripts/Update-Set-Table.ps1"

Terminal:

pswh -File "/home/administrator/PowerShellScripts/Update-Set-Table.ps1"

Working perfectly when I run that command in the terminal but it doesnt seem to be running from the cronjob.

Answer 1

you need to specify the full path to the executable pwsh . you can do so by using which APPNAME in a terminal.

which pwsh

then change the line in your crontab accordingly. for me the working result looks like this:

* * * * * /snap/bin/pswh -File "/home/administrator/PowerShellScripts/Update-Set-Table.ps1"

Answer 2

Cron's lack of environment has this side effect: the working directory changes. In my case I was writing to a file I expected to be in the script's directory which was being created & written to nicely in $HOME.

The script's directory is held in the PoSh variable $PSScriptRoot

PoSh has a symlink at /usr/bin/pwsh so the full path is not necessary (for me anyway)

The current (Vixie) cron allows standard variables which can be used for paths. Check the author in man crontab

If you're script has a #!/usr/bin/pwsh shebang & is executable it executes like any script without specifying 'pwsh'

BTW if you're displaying to screen, say a dialog, the cron job must be prefaced with env DISPLAY=:0 (or some other number) in order to display. eg env DISPLAY=:0 pwsh $ScriptHome/DiskFull-WereGoingToCrash.ps1 -display