Need to get a loop variable from output of a command
Hi,
I am trying to get a loop counter i and set its value as the ouput of a command:
Then I want to use i as counter to run a loop i number of times.
Like if i gets a value of 5 I'll have to run loop 5 times.
But will i here be a numeric variable? If it won't be numeric then how can I make it a numeric variable and use it as couter to run the loop.
Please help. I tried to search but didn't get what I am looking for.
Thanks in advance,
Pramod
Last edited by Scott; 10-25-2012 at 02:59 PM..
Reason: Code tags
With cut -c 8-13 myfile,
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In my shell script I am trying to assign something like this,
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If I dont assign, then script executes well.
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Discussion started by: sankasu
12 Replies
LEARN ABOUT REDHAT
while
while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________NAME
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)