there are no spaces between the words. How can I fix that?
Looks like only one command is executed within the for loop if you leave out the braces { and } in the for loop.
Either you use Don's first approach with braces, or you try this:
Note that all approaches mentioned here will produce a superfluous whitespace at the end of the output. One possible solution:
This User Gave Thanks to junior-helper For This Post:
Hi there,
i would like to repeat a command in a shell sript (bash)
the script starts with a menu to choose a menu point to do something ....
on the end of the script i would like to restart the programm to choose the menu points on the beginning.
I would also make a sript that send... (2 Replies)
Hi,
how to do that ? I mean only print it but not execute. I'm using putty to interact with ksh.
(in windows cmd up arrow does the job)
thanks
vilius (5 Replies)
Hi all,
Is there a way to bring back the previous unix command without retyping?
I tried the "arror up" key, and it seems not working (sun solaris). What is the correct way?
Thanks! (4 Replies)
HI
I have a text file named docs with 100 filenames with full directory path one by one. I want to perform an action on all of them, the action i want to do this chown bin:bin <filename>. The <filename> should be each line in the docs text file. Please give the code. Somebody told to use for... (2 Replies)
I need to repeat this command on a configurable interval:
igal -a -r -U -w 6
I tried this:
#!/bin/bash
igal -a -r -U -w 6
sleep 30
Just a guess that it MIGHT work.
Can anyone point me in the right direction?
-R (6 Replies)
Is there a way to repeat the output of the last command for filtering without running the command again? All I could think of was to copy all the data to a text file and process it that way, is there another way? Like say I want to grep server.server.lan from a dtrace that was pages long after I... (5 Replies)
Hi,
I would like to run the clear command, for every 10 times I hit the enter button. Is there a way to track the number of times the enter button is hit and run the clear command?
Thanks (2 Replies)
How to repeat the execution of a simple command like the following for 1 sec ?
echo Hi
The completion time for the command is not known, but we need to calculate the number of times this commans executes successfully within 1 sec.
Thanks
Kumarjit (5 Replies)
Assume i have typed 4 commands in the past like
vi `ls -t |head -n 1`
tail -2 test.txt
ls -lrt | grep "/etc/profile.d"
pwd
Now if i type r p it should execute the command "pwd" likewise r t should execute tail -2 test.txt.
Note: esc k and using up arrow and down arrow will get this work... (3 Replies)
Discussion started by: Ramanareddygv
3 Replies
LEARN ABOUT CENTOS
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
}
EXAMPLE
Read lines from a channel until we get to the end of the stream, and print them out with a line-number prepended:
set lineCount 0
while {[gets $chan line] >= 0} {
puts "[incr lineCount]: $line"
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)