running scripts

[huskers]

Hi,

I have 3 scripts that I need to run one after the other i.e. the second script gets kicked after the first one is done and so on. I do not know how long each script takes to run. Could anyone tell me how i cam acheive this. I am new to tcl so any help would be appreciated.

Thanks

 

[ulis]

For *N*X and Windows, you can use 'exec':
exec -- $script1
exec -- $script2
exec -- $script3

The three shell scripts will be exec'ed one after the other.

You should read the Tcl manual exec page for more information.

HTH

ulis

 

[huskers]

Thanks for the reply. If i have three scripts a, b, c that need to be executed one after the other and if my program goes something like this:

#!/usr/local/wictcl/bin/wictcl
exec a
exec b
exec c

According to my understanding if i run this process in the background, then this program will fork three shells each executing that particular script but i do not want it that way. line 2 should be executed only after line 1 is done and so on.

Thanks

 

[ulis]

'exec' can work as you described but with a slighter different syntax:

exec $cmd &

With the & appended to the command, Tcl launches a shell and continues the execution of the Tcl script without waiting.

With the syntax I indicated Tcl does another thing:
It waits for the completion of the script before continuing, this to be able to get the result of the exec'ed script.

set here [exec pwd]

will result of the current working directory -returned by pwd- to be put in the here variable.

Don't be fooled:

exec pwd

will wait because the final & is not here.

So, the code:

exec $script1
exec $script2
exec $script3

will do what you want.

To be convinced, make a try and see what happens.

HTH

ulis