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Full Discussion: Problem with print command
Top Forums Shell Programming and Scripting Problem with print command Post 302074083 by Perderabo on Friday 19th of May 2006 02:05:33 PM
Old 05-19-2006
sed '1d' ${SQLLISTFILE} | tee ${SQLLISTFILE} > /dev/null 2>&1 --->This command executes fine.
Smilie Smilie Smilie
Never write code soon after you look at one of M C Escher's drawings! You are reading from and writing to the same file from different sides of the same pipeline. OK, that almost makes sense... But the whole purpose of tee is to duplicate an I/O stream. You're keeping the duplicate and sending the original to /dev/null?! Umm...you wanted a fresh copy? Anyway you are going to get different results depending on a lot of factors. You need your sed process to completely read the file prior to the tee process opening the file. That might happen every now and then if the file is short enough.
 

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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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