Sponsored Content
Top Forums Shell Programming and Scripting Why do these 2 methods result in different outcomes? Post 303021980 by BLinux on Wednesday 22nd of August 2018 03:41:34 AM
Old 08-22-2018
thank you everyone. i got it now. i was confused about the return behavior of (( counter++ )). so, to get what i was expecting, i can use either:

Code:
(( ++counter ))
(( counter = counter + 1 ))
counter=$((counter+1))
let counter=counter+1

all of the above would return 0. where as:

Code:
(( counter++ ))

would return 1 (when counter=0), but return 0 after counter > 0.




Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 08-22-2018 at 05:24 AM.. Reason: Added CODE tags.
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

file transfer Methods

I would like to write shell script to transfer some ASCII files from HPUX server to Linux server or vice-versa. What options I have for file transfer Methods. 1) FTP 2) rcp 3) HTTP 4)Whatelse? (2 Replies)
Discussion started by: Teh Tiack Ein
2 Replies

2. What is on Your Mind?

Predict Future Outcomes in Our Event Prediction Market

Folks love to predict the future, so we have enabled predicting the future for members. So, please enjoy placing your Forum Bits predicting future outcomes in our new Event Prediction Market. Current events you can predict include science, technology, M&A and other global events: Oracle... (0 Replies)
Discussion started by: Neo
0 Replies

3. Shell Programming and Scripting

Methods to SSH (Perl)...

Can anyone break down the different methods of using SSH in perl? I'm currently using Net::SSH::Expect, which allows me to login to a machine and execute multiple commands without having to ssh again. This feature of holding the session works well for me, but it's slow. If I set timeouts to 4... (3 Replies)
Discussion started by: mrwatkin
3 Replies

4. UNIX for Advanced & Expert Users

yum provides methods

What is the difference between these yum provides and whatprovides methods? I know provides and whatprovides give the same results, but different methods of */ and \* give different results. Also whether you put */ and \* in front of the string or behind the string give different results. I have... (0 Replies)
Discussion started by: cokedude
0 Replies

5. Solaris

Unix learning methods

I have recently completed Solaris 10 System Administration book by Bill Calkins. Now I want to learn more about UNIX. I have tried to research online but there is too much information and I am sort of overwhelmed and don't know where to start. Can anybody give some idea on how to pursue my learning... (3 Replies)
Discussion started by: saudsos
3 Replies

6. Shell Programming and Scripting

Perl Methods Calling

Hello I am on my way to improve my wonderful Perl skills, I got an issue which I want to share with you all. I have a Perl module which looks like package Cocoa; require Exporter; @ISA = qw(Exporter); my $a=''; my $b=''; my $c=''; sub new { my $this = shift; # Create... (8 Replies)
Discussion started by: adisky123
8 Replies

7. Shell Programming and Scripting

How to compare the current result with previous line result.?

Hi Gurus, I have requirement to compare current result with previous reuslt. The sample case is below. 1 job1 1 1 job2 2 1 job3 3 2 job_a1 1 2 job_a2 2 2 job_a3 3 3 job_b1 1 3 job_b2 2 for above sample file, GID is group ID, for input line, the job run... (1 Reply)
Discussion started by: ken6503
1 Replies

8. Linux

Help with PAM Logging methods.

Hi Folks, Would like to understand if there exists any method to write the logs for LDAP authenticated users and Local Users separately in two different files. If not, then do I distinguish whether the user is LDAP or local without looking at passwd. Bye the way, I am trying this weird... (0 Replies)
Discussion started by: awk-admirer
0 Replies

9. UNIX for Beginners Questions & Answers

One Line Command how to use pipe statements to execute and comment on multiple possible outcomes

Hello Forum, I'm looking to expand the following command: INACTIVE_KERNELS=$(python -mplatform | grep -qi red && rpm -qa | grep '^kernel-' |grep -vE `uname -r` | paste -sd \; || echo "Not Red Hat Server") Currently this command will check if my server is RedHat server using the grep -qi... (6 Replies)
Discussion started by: greavette
6 Replies
SHCOMP(1)						    User Environment Utilities							 SHCOMP(1)

NAME
shcomp - compile a ksh93 shell script SYNOPSIS
shcomp [ options ] [infile] [outfile]] ORIGIN OF THIS MAN PAGE
This man page was written by Christophe Martin <Schplurtz@free.fr> for the Debian GNU/Linux system. It is based on "shcomp --man" output. DESCRIPTION
Unless -D is specified, shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh93 can read and execute with the same effect as the original script. Since aliases are processed as the script is read, alias definitions whose value requires variable expansion will not work correctly. If -D is specified, all double quoted strings that are preceded by $ are output. These are the messages that need to be translated to locale specific versions for internationalization. If outfile is omitted, then the results will be written to standard output. If infile is also omitted, the shell script will be read from standard input. OPTIONS
-D, --dictionary Generate a list of strings that need to be placed in a message catalog for internationalization. -n, --noexec Displays warning messages for obsolete or non-conforming constructs. -v, --verbose Displays input from infile onto standard error as it reads it. --man Displays this man page on standard error and exits. --help Shows a short help message and exits. EXIT STATUS
0 Successful completion. >0 An error occurred. DEBIAN WARNING
On a Debian GNU/Linux system, more than one package may provide ksh. the output of shcomp can only be used by ksh93. Any other ksh will be unable to run the compiled script. EXAMPLE
( echo '#! /bin/ksh93' ; shcomp myscript ) > myscript.bin && chmod 755 myscript.bin ./myscript.bin SEE ALSO
ksh(1) IMPLEMENTATION
version shcomp (AT&T Labs Research) 2003-03-02 author David Korn <dgk@research.att.com> copyright Copyright (c) 1982-2005 AT&T Corp. license http://www.opensource.org/licenses/cpl1.0.txt KSH93 Fri Jun 3 2005 SHCOMP(1)
All times are GMT -4. The time now is 09:12 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy