Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   6284 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

if(n)		      Tcl Built-In Commands		    if(n)

_________________________________________________________________

NAME
       if - Execute scripts conditionally

SYNOPSIS
       if expr1 ?then? body1 elseif expr2 ?then? body2 elseif ...
       ?else? ?bodyN?
_________________________________________________________________

DESCRIPTION
       The if command evaluates expr1 as an  expression	 (in  the
       same  way that expr evaluates its argument).  The value of
       the expression must be a boolean (a numeric value, where 0
       is  false  and anything is true, or a string value such as
       true or yes for true and false or no for false); if it  is
       true  then  body1  is  executed	by  passing it to the Tcl
       interpreter.  Otherwise expr2 is evaluated as  an  expres-
       sion  and if it is true then body2 is executed, and so on.
       If none of the expressions evaluates to true then bodyN is
       executed.   The	then  and  else	 arguments  are	 optional
       ``noise words'' to make the command easier to read.  There
       may  be	any  number  of	 elseif	 clauses, including zero.
       BodyN may also be omitted as long as else is omitted  too.
       The  return  value  from	 the command is the result of the
       body script that was executed, or an empty string if  none
       of the expressions was non-zero and there was no bodyN.

KEYWORDS
       boolean, conditional, else, false, if, true

Tcl								1

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 

Vote for polarhome