Very Computer

What does '&&' mean between two entries on a crontab.
eg 00 07 /usr/bin/ksh -c /job1.sh && /job2.sh

Does it mean start job2 after job1 completes
or does it mean start job1 and job2 simultaneously

Thanks
Matt

A && B

If A succeeds run B....

Quote:

> Does it mean start job2 after job1 completes
> or does it mean start job1 and job2 simultaneously

> Thanks
> Matt

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The former, and additionally that job2 starts after job1 completes
_successfully_ (returns error code zero).

Executing

        x && y

is equivalent to

        if x
        then
            y
        fi

but is much more compact.

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  >> What does '&&' mean between two entries on a crontab.
  >> eg 00 07 /usr/bin/ksh -c /job1.sh && /job2.sh
  >>
  >> Does it mean start job2 after job1 completes
  >> or does it mean start job1 and job2 simultaneously

  emf> The former, and additionally that job2 starts after job1 completes
  emf> _successfully_ (returns error code zero).

The important thing to note is that the command line to be executed in a
cron job is not in any special "cron language".

It's just a shell script.

So, what you want to ask is, "what does the && operator do in Bourne
shell?"

Erik gave the answer, but so would your local shell man page, I daresay :).

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Almost equivalent:  if x returns non-zero status
    x && y
returns the same non-zero status, but
    if x ; then y ; fi
returns zero status.

I expect this is POSIX-mandated behavior but I
don't have access to a copy of the standard.

Almost equivalent:  if x returns non-zero status
    x && y
returns the same non-zero status, but
    if x ; then y ; fi
returns zero status.

I expect this is POSIX-mandated behavior but I
don't have access to a copy of the standard.