Re: [Newos-developers] Shell improvements

[Dan S. <dj2...@st...>]

Hey,

I was just trying the new shell code and found a bug.  I was trying to run
the fibo program.

If i do /boot/bin/fibo it prints the usage message out like its suppost to,
but if i do /boot/bin/fibo 5 it says can find '5'.  So i took a look at some
of the argv items.  In the first case I've got
argv[0] = exec, argv[1] = /boot/bin/fibo

in the second case
argv[0] = exec, argv[1] = 5

So it seems to be clobering the name of the program with the argument.

dan

On Friday 25 January 2002 14:57, you wrote:
> Hi,
>
> The attachment contains the source of the shell to wich I added
> the following features:
>
> Variables
> ==========
>
> Variables must start with "$" after wich a character
>  and  than characters, numbers or "_" can follow.
>
> e.g.
>
> valid variables are:
>
> $A9
> $A_B_C
> $a_B_c
>
> Invalid are
>
> $9A
> $8888
> $_A (sorry I do fix this in the next version)
>
> When a new shell is started from the shell, it doesn't inherit
> the variables.
>
> expressions
> ============
>
> In the current version the following expressions are possible:
>
> *<Variable>
> *numbers
> *string (single or double qouted)
>
>
> strings
> =======
>
> A String can be single or double qouted.
> In double qouted strings varibales are replaced by their values:
> e.q.
> "path=$path" becomes "path=/boot/bin:/boot"
> 'path=$path'         "path=$path"
>
>
> Load operator
> =============
> Variabels can be set as folows:
>
> <variable>=<expression>
>
> e.q.
>
> $shell="/boot/bin/shell"
>
> When using a variable to call a program it is necessary to
> use the 'exec' command:
>
> e.g.
>
> exec $shell
>
>
> echo
> =====
>
> The echo syntax is
>
> echo [expression {,expression}]
>
> e.g.
>
> echo "path=",$path
>
> echo doesn't support the '>' operator yet.
>
> path variable
> =============
>
> There is one predefined variable: path.
> The execute statement uses this variables for the search path.
> The directories are seperated by a ':'.
> E.g.
> path="$path:/boot/bin"
>
>
>
> Substitute
> ==========
>
> The older commands like mount,ls,mkdir etc.. also supports
> variables. The command line is first parsed and then
> the variables are substituted by their values.
>
> e.g.
>
> $me="\boot"
>
> ls $me
>
> mkdir $me
>
> Single and double qouted strings are handled as mentioned before.
>
> ====================
>
> Next i whould like to add:
> ==========================
> *if
> *labels
> *goto
> *Reading script from file
> *Formula's
> *A swimming  pool.
>
> Greez Jer.

-------------------------------------------------------