while [ $curr_time -ge $time7pm and $curr_time -le $time630am ]
The reason the script did not exit is because the "and" condition is incorrect.
Should have been:
But there is a design issue with using integer comparisons with HHMM fields because the leading zero disappears for hours less than 10. Mathematically this in itself would not be an issue if we had 100 minutes to the hour - but we don't!
jgt's IDEA is much better (but the script has problems). Do integer comparision in whole minutes (not seconds unless you need that accuracy).
I can't see how that script gets out of the while loop. Personally I would use "while true" and then the "break" command to get out of the while loop when the condition is met.
Last edited by methyl; 01-14-2012 at 06:02 PM..
Reason: removed wrong assumption
If I want a script to sleep for less than a second, would I use a decimal? In other words, if I wanted my script to sleep for 1/4 of a second, would I say, SLEEP .25 ?? (5 Replies)
Does anyone know a way to sleep less than 1 second?
Sometimes when I write scripts that iterates a loop many times it would be
nice to slow things down, but sometimes 1 second is too much. (9 Replies)
I would like to use the result of a query in another query. How do I redirect/add the output to another variable?
$result = odbc_exec($connect, $query);
while ($row = odbc_fetch_array($result)) {
echo $row,"\n";
}
odbc_close($connect);
?>
This will output hostnames:
host1... (0 Replies)
Hi,
I work on HPUX application and i had a query regarding the sleep & localtime system call in HPUX.
Here is the code that we have :
const uint32_t WAKE_INTERVAL_SEC(30*60);
while (true) {
// Find out what time it is
time(¤tTime);... (3 Replies)
This is a very crude attempt in Bash at something that I needed but didn't seem to find in the 'sleep' command. However, I would like to be able to do it without the need for the temp file. Please go easy on me if this is already possible in some other way:
How many times have you used the... (5 Replies)
Hi,
I have a requirement as below which needs to be done viz UNIX shell script
(1) I have to connect to an Oracle database
(2) Exexute "SELECT field_status from table 1" query on one of the tables.
(3) Based on the result that I get from point (2), I have to update another table in the... (6 Replies)
Hi,
I need to query Oracle database for 100 users. I have these 100 users in a file. I need a shell script which would read this User file (one user at a time) & query database.
For instance:
USER CITY
--------- ----------
A CITY_A
B CITY_B
C ... (2 Replies)
Hi,
I have a script that runs a process at the beginning and I want to sleep/wait until this process is finished and then continue with the rest of the script. I am trying with this, but it is not working:
process=`ps -ef | grep "proc_p01 -c" | grep -v grep | wc -l`
if ; do
sleep 10
done... (7 Replies)
Discussion started by: apenkov
7 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)