/etc/cron.hourly/somejob refuses tor start a bash script

bai4Iej2need · Yesterday 12:21:56

I have tested now several versions
Version 1

head central_sync
#!/bin/bash
# synchronise Unlimited number of directories on different hosts
...

central_sync is a hardlink to /usr/local/bin/central_sync.bash

version 2

cat central_sync2
#!/bin/sh
set
/bin/bash /usr/local/bin/central_sync.bash

exit 0

version 3

cat central_sync3
#!/bin/sh
set
/bin/bash -x /usr/local/bin/central_sync.bash

exit 0

version 4

cat central_sync4
#!/bin/sh
set
/bin/bash --posix /usr/local/bin/central_sync.bash

exit 0

They all produce in the protocol log:

...
set 
...
SHELL=/bin/sh

Consequently the program fails, which runs when called in the console/terminal
Parameter expansion fails in hte rsync command

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