02-26-2020
It prints the line occurrence of column 1 ($1). a[$1]++ fails for the first occurrence increment since the array value for that key does not exist. The ! means not true so the expression is evaluated to true. The default action for true in awk is to print the line. In other terms: if the previous value of column 1 in array "a" cannot be incremented then print the line. The line could have been written as: '{if (! a[$1]++) print $0}'
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LEARN ABOUT OSX
tcl_callwhendeleted
Tcl_CallWhenDeleted(3) Tcl Library Procedures Tcl_CallWhenDeleted(3)
__________________________________________________________________________________________________________________________________________________
NAME
Tcl_CallWhenDeleted, Tcl_DontCallWhenDeleted - Arrange for callback when interpreter is deleted
SYNOPSIS
#include <tcl.h>
Tcl_CallWhenDeleted(interp, proc, clientData)
Tcl_DontCallWhenDeleted(interp, proc, clientData)
ARGUMENTS
Tcl_Interp *interp (in) Interpreter with which to associated callback.
Tcl_InterpDeleteProc *proc (in) Procedure to call when interp is deleted.
ClientData clientData (in) Arbitrary one-word value to pass to proc.
_________________________________________________________________
DESCRIPTION
Tcl_CallWhenDeleted arranges for proc to be called by Tcl_DeleteInterp if/when interp is deleted at some future time. Proc will be invoked
just before the interpreter is deleted, but the interpreter will still be valid at the time of the call. Proc should have arguments and
result that match the type Tcl_InterpDeleteProc:
typedef void Tcl_InterpDeleteProc(
ClientData clientData,
Tcl_Interp *interp);
The clientData and interp parameters are copies of the clientData and interp arguments given to Tcl_CallWhenDeleted. Typically, clientData
points to an application-specific data structure that proc uses to perform cleanup when an interpreter is about to go away. Proc does not
return a value.
Tcl_DontCallWhenDeleted cancels a previous call to Tcl_CallWhenDeleted with the same arguments, so that proc will not be called after all
when interp is deleted. If there is no deletion callback that matches interp, proc, and clientData then the call to Tcl_DontCallWhen-
Deleted has no effect.
KEYWORDS
callback, delete, interpreter
Tcl 7.0 Tcl_CallWhenDeleted(3)