Top Forums Shell Programming and Scripting Extract whole word preceding a specific character pattern with first occurence of the pattern Post 303040920 by jcdole on Saturday 9th of November 2019 11:22:00 AM
Thank you every body for helping
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while(n)						       Tcl Built-In Commands							  while(n)


while - Execute script repeatedly as long as a condition is met SYNOPSIS
while test body _________________________________________________________________ DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe- cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi- nation of the while command. The while command always returns an empty string. Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while command starts execut- ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter- ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10: set x 0 while {$x<10} { puts "x is $x" incr x } SEE ALSO
break(n), continue(n), for(n), foreach(n) KEYWORDS
boolean value, loop, test, while Tcl while(n)

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