The unix sleep command
sleeps for whole seconds. The code you gave sleeps for 150 millseconds. It actually takes longer than 150 milliseconds because the shell has to create a process and load perl into it, then "sleep" for 150 ms.
Specifically what is the purpose of sed?
What is f?
Why is the 'cp f $phonefile' line needed when the script ‘goes live'?
Why might that two commands following sed be commented out at the present time ( i.e., during development)?
Thanks in... (2 Replies)
I am using this line of perl code to change the file format and remove ^M at the end of each line in files:
perl -i -pe's/\r$//;' <name of file here>
Can you explain to me what this code does, and translate it into bash/awk/sed? (2 Replies)
Hi,
I saw this. But I don't know why we need this?
ls mydir > foo.txt ## I know what this will do, it will take the results and write to the file called foo.txt
ls mydir > foo.txt 2>&1 ## Don't know why we need 2>&1
Thanks. (2 Replies)
Please explain grep -A 999999. I've seen this before, it always seems to be with six 9's as well. See an example below.
grep 'regexp' -A 999999 server.log | egrep -c 'Option=\' (6 Replies)
su - keibatch -c ""date ; /usr/local/kei/batch/apb/bin/JKEIKYK4140.sh -run "&$C$6&" WSUKE100201""
Not clear about : date ; /usr/local/kei/batch/apb/bin/JKEIKYK4140.sh -run "&$C$6&" WSUKE100201
Please help (2 Replies)
Hi Forum.
I have the following script /home/user/EDW_ENV.sh to setup some environment variables as:
##### section 1 PM_HOME #####
export PC_DIR_BASE=/data/informatica/ming
export DIR_ORACLE=/data/sw/apps/oracle/Oracle_scripts
export... (4 Replies)
I have a requirement to remove all non-ascii characters from a fixed length file. I used the below command which is removing special characters but somehow the total record length is being truncated to one space less. If it is a multi-byte string then many characters at the end are being truncated.... (8 Replies)
Perl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaUsercContributed Perl DPerl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaSelect(3pm)NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaSelect - Use Time::HiRes instead of something like "select(undef, undef, undef,
.05)".
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Conway discourages the use of "select()" for performing non-integer sleeps. Although documented in perlfunc, it's something that generally
requires the reader to read "perldoc -f select" to figure out what it should be doing. Instead, Conway recommends that you use the
"Time::HiRes" module when you want to sleep.
select undef, undef, undef, 0.25; # not ok
use Time::HiRes;
sleep( 0.25 ); # ok
CONFIGURATION
This Policy is not configurable except for the standard options.
SEE ALSO
Time::HiRes.
AUTHOR
Graham TerMarsch <graham@howlingfrog.com>
COPYRIGHT
Copyright (c) 2005-2011 Graham TerMarsch. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.14.2 2012-06-07 Perl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaSelect(3pm)