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Full Discussion: Execute sed altered script
Top Forums Shell Programming and Scripting Execute sed altered script Post 302497552 by apmcd47 on Thursday 17th of February 2011 02:11:50 PM
Old 02-17-2011
As the file is a shellscript of some kind make the script do the work:
Code:
myscript [switches] args...        # does the rm/tar
myscript -n [switches] args ...    # do not do rm/tar

At the start of the script:
Code:
noop=""

In the getopts section (normally a case statement in a getopts loop):
Code:
n) noop=":" ;;

If you are not using a getopts loop you may change this to suit your program.
Prefix the rm/tar statements with $noop:
Code:
$noop rm ....

The colon acts as a "no-operation" operator. Watch out for side-effects, eg
Code:
${some:=thing}

will be evaluated ($some will be set to thing if null).

Andrew
This User Gave Thanks to apmcd47 For This Post:
 

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Tcl_AllowExceptions(3)					      Tcl Library Procedures					    Tcl_AllowExceptions(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tcl_AllowExceptions - allow all exceptions in next script evaluation SYNOPSIS
#include <tcl.h> Tcl_AllowExceptions(interp) ARGUMENTS
Tcl_Interp *interp (in) Interpreter in which script will be evaluated. _________________________________________________________________ DESCRIPTION
If a script is evaluated at top-level (i.e. no other scripts are pending evaluation when the script is invoked), and if the script termi- nates with a completion code other than TCL_OK, TCL_ERROR or TCL_RETURN, then Tcl normally converts this into a TCL_ERROR return with an appropriate message. The particular script evaluation procedures of Tcl that act in the manner are Tcl_EvalObjEx, Tcl_EvalObjv, Tcl_Eval, Tcl_EvalEx, Tcl_GlobalEval, Tcl_GlobalEvalObj, Tcl_VarEval and Tcl_VarEvalVA. However, if Tcl_AllowExceptions is invoked immediately before calling one of those a procedures, then arbitrary completion codes are per- mitted from the script, and they are returned without modification. This is useful in cases where the caller can deal with exceptions such as TCL_BREAK or TCL_CONTINUE in a meaningful way. KEYWORDS
continue, break, exception, interpreter Tcl 7.4 Tcl_AllowExceptions(3)
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