Using printf isn't a magic bullet here; as RudiC said in post #2, the way to get rid of the ambiguity between the logical expression CITYCOUNT > 2 and the output redirection > 2 is to use parentheses. Note that even with printf this can still be an issue. The following script:
produces the following output on standard output (from the last two printfs in the loop:
(which both have a logical expression inside parentheses), and produces the following output from the first printf in the loop in a file named 2:
I want to run tail -f to continuously monitor a log file, outputing a specific field to a second log file. I can get the first portion to work with the following command:
tail -f log | awk '{if ($1 == "Rough") print $5}'
also:
awk '{if ($1 == "Rough") print $5}' <(tail -f log)
The... (2 Replies)
Hi,
i use awk -F to print three variable delimited by comma $1 $2 $3
if $2=="" i want to extract this information missing from another file using awk -v + some process.
but the problem i can't use the two awk together cause of redirection
there's a solution.
note: i can't use another... (1 Reply)
Hello,
i need to redirect the output of print to a variable file name:
#This is normal
awk '{ print $17 > "output.txt" }' input
#I need something like this
awk '{ print $17 > "output_${25}.txt" }' input
how to format the output file name to contain a variable? (6 Replies)
I'm trying to find average of values in 2nd column in some files. Filenames have following pattern eg:
tau_2.54_even_v1.xls
tau_2.54_odd_v1.xls
tau_1.60_v1.xls
tau_800_v1.xls
#!/bin/bash
for file in pmb_mpi tau xhpl mpi_tile_io fftw ; do
for f in "2.54" "1.60" "800" ;do
if... (2 Replies)
I have a system stat command running which generates data after 5 sec or so. I pass this data to awk and do some calculation to present the data differently. Once done now I want to pass this data to file as and when generated but doesn't work..unless the first command completes successfully.... (6 Replies)
Hi everyone
i am facing a very strange problem . see below is my code
#awk <do something> file 1 > file2
Now the problem is whenever i am redirecting the output to file2 it creates the file2 but of 0 size. i don't know what is the reason but it is very important to me to redirect the... (11 Replies)
Hi,
I am using AIX server. I have a korn shell script where in I am redirecting a line to a file in a while loop:
while read line
do
outputline=$line;
echo $outputline >> "./temp/exec_list_"$ETL_JOB_RUN"_temp"
done < ./temp/exec_list_$ETL_JOB_RUN
Sometimes, when the CPU... (2 Replies)
I almost reach my objective (Youhouuu !!!!)
But I really don't understand why it doesn't work until the end... :wall:
For clarity's sake I am taking a very simple example. The operations I am doing in the script (gsub and print) really don't have any importance !!! I just matter about... (10 Replies)
Hi Friends,
I am trying to scan line by line using awk and pull the values and pass it in variables and then will use the variables but doesn't work.
Please see below for details.
#more dbtest.sh
----------------------------------
#!/bin/bash
. $HOME/.bash_profile
while read line
do... (6 Replies)
I am trying to add 0393 value at 24th feild using the below command, but its adding at all the lines including header and trailer
Input file:
ZHV|2657|D0217001|T|TXU|Z|PAN|20131112000552||||OPER|
754|52479|
492|489|SP40|1014570286334|20131111|20131201|14355334|CHAMELON... (1 Reply)
Discussion started by: Aditya_001
1 Replies
LEARN ABOUT DEBIAN
io::async::timer::absolute
IO::Async::Timer::Absolute(3pm) User Contributed Perl Documentation IO::Async::Timer::Absolute(3pm)NAME
"IO::Async::Timer::Absolute" - event callback at a fixed future time
SYNOPSIS
use IO::Async::Timer::Absolute;
use POSIX qw( mktime );
use IO::Async::Loop;
my $loop = IO::Async::Loop->new;
my @time = gmtime;
my $timer = IO::Async::Timer::Absolute->new(
time => mktime( 0, 0, 0, $time[4]+1, $time[5], $time[6] ),
on_expire => sub {
print "It's midnight
";
$loop->stop;
},
);
$loop->add( $timer );
$loop->run;
DESCRIPTION
This subclass of IO::Async::Timer implements one-shot events at a fixed time in the future. The object waits for a given timestamp, and
invokes its callback at that point in the future.
For a "Timer" object that waits for a delay relative to the time it is started, see instead IO::Async::Timer::Countdown.
EVENTS
The following events are invoked, either using subclass methods or CODE references in parameters:
on_expire
Invoked when the timer expires.
PARAMETERS
The following named parameters may be passed to "new" or "configure":
on_expire => CODE
CODE reference for the "on_expire" event.
time => NUM
The epoch time at which the timer will expire.
Once constructed, the timer object will need to be added to the "Loop" before it will work.
Unlike other timers, it does not make sense to "start" this object, because its expiry time is absolute, and not relative to the time it is
started.
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::Timer::Absolute(3pm)