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--- jvs:fscan:manual:chapter2:if [2011/03/31 14:49]
127.0.0.1 external edit
+++ jvs:fscan:manual:chapter2:if [2023/02/23 18:43]
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-**fScan Reference Manual, Chapter 2 (CmdLineOptions): if**
-===== If -- Test some condition before executing commands =====
-**usage:** -if EXPR { COMMANDS }\\
-**or:** -if ! EXPR { COMMANDS }
-===== =====
-The EXPR argument to IF must be an expression that will yield a numerical value.
-If EXPR > 0, the COMMANDS string inside the curly brackets will be executed next.\\
-If EXPR <= 0, the COMMANDS string will be ignored.
-EXPR can be a single number, an arithmetic expression, or a [[jvs:fscan:manual:chapter1:status|status query]]. The EXPR argument must not contain any spaces within it. Examples of valid EXPR arguments are:
-  $xdim                - data set image width
-  ?taskname            - query whether the TASKNAME variable is set for the current data set
-  $zdim-30             - true if there more than 30 slices (ZDIM)
-  exists(param.tmp)    - true if file "param.tmp" exists
-If '!' appears before the EXPR argument, the IF condition is true if EXPR is 0.\\
-Note: the '!' must be separated from IF and EXPR by spaces.
-**See Also:**\\
-[[jvs:fscan|fScan Home]],
-[[jvs:fscan:manual|fScan Manual]],
-[[jvs:fscan:manual:chapter2|CmdLineOptions]],
-[[jvs:fscan:manual:help|Manual Help]]

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