Scripts are composed of a sequence of statements. Statements usually comprise at least one command and optionally control words such as if and then. A command is a single line of text starting with one of the command names listed in the Command Reference.
In this topic:
Plot v1_pis a command that will create a graph of the vector v1_p. The syntax varies for each command. Full details are given in the Command Reference.
All commands must start on a new line or after a semi-colon. They must also end with a new line or semi-colon.
A command statement is a sequence of one or more commands.
if expression then statement endifOR
if expression then statement else statement endifOR
if expression then statement [[elseif expression then statement ]...] else statement endif
if NOT SelSchem() then echo There are no schematics open exit all endif if length(val)==1 then echo {refs[idx]} {val} else echo Duplicate reference {refs[idx]}. Ignoring endif if opts[0] && opts[1] then let sel = 1 elseif opts[0] then let sel = 2 else let sel = 3 endif
In form1, if the expression resolves to a TRUE value the statement will be executed. (TRUE means not zero, FALSE means zero). In the second form the same happens but if the expression is FALSE the statement after the else is executed. In the third form, if the first expression is FALSE, the expression after the elseif is tested. If that expression is TRUE the next statement is executed if not control continues to the next elseif or else.
do while expression statement loopOR (alternative form)
while expression statement endwhile
do while GetOption(opt)<>'FALSE' let n = n+1 let opt = 'LibFile' & (n+99) loopBoth forms are equivalent.
In while loops the expression is evaluated and if it is TRUE the statement is executed. The expression is then tested again and the process repeated. When the expression is FALSE the loop is terminated and control passes to the statement following the endwhile.
A script statement is a call to execute another script. Scripts are executed initially by typing their name at the command line (or if the script has .sxscr extension, the .sxscr can be omitted) or selecting a key or menu which is defined to do the same. Scripts can also be called from within scripts in which case the call is referred to as script statement. Note that a script may not call itself.
exit while exit for exit script exit allexit while forces the innermost while loop to terminate immediately. Control will pass to the first statement after the terminating endwhile or loop.
exit for does the same for for-loops.
exit script will force the current script to terminate. Control will pass to the statement following the call to the current script.
exit all will abort all script execution and control will return to the command line.
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