how to debug .sh type script

[Matthew Seaman]

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On 31/05/2010 08:59:04, Aiza wrote:
> Is there way to single step through each line of code and see the real
> values of the variables?

Not 'single step' as such -- what you can do is run with '-x' which
prints each line as it is executed.  That's either:

   sh -x scriptname

or you can add it to the #! line in the script, or just stick 'set -x'
somewhere in the script body.

If you use the 'set -x' form, you can set it up to trace through just
the interesting parts of your code. (Somewhat counter intuitively 'set
- -x' or 'set -o xtrace' turns on trace mode; 'set +x' or 'set +o xtrace'
turns it off)

This doesn't give you a way of arbitrarily querying the value of any
variable, but you will be able to see all variable assignments as part
of the trace.

There's also a '-v' flag which adds displaying input read by the shell
as it executes.

	Cheers,

	Matthew

- -- 
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
JID: matthew at infracaninophile.co.uk               Kent, CT11 9PW
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