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Full Discussion: forcefully throwing error : unix script
Top Forums UNIX for Dummies Questions & Answers forcefully throwing error : unix script Post 302242031 by era on Wednesday 1st of October 2008 03:42:46 AM
Old 10-01-2008
Code:
if command; then
  : nothing
else
  rc=$?
  echo command failed: exit code $rc >&2
  exit $rc  # terminate script here and now
fi

# or
command || exit $?

# or
set -e
command

The inverted code in the if/then/else is required if you want to capture the exit code from the command. Otherwise you can simply write

Code:
if ! command; then
  echo command failed, exiting >&2
  exit 255
fi

The redirection to >&2 is customary; you want error messages on standard error, not standard output.

The shorthand with || is unobvious but quite logical (sic) once you get it.

The command set -e forces the script to exit immediately if any command fails.
 

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LEARN ABOUT SUSE

tcl_allowexceptions

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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