Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Help with loops?
Top Forums UNIX for Advanced & Expert Users Help with loops? Post 302921707 by neutronscott on Sunday 19th of October 2014 07:24:41 PM
Old 10-19-2014
You can iterate over an array in a while loop. First we'll need an array though. sh only has 1 -- $@. Let's use that.

Code:
$ set -- Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto
$ while [ $# -gt 0 ]; do echo $1; shift; done
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto

You can do it without shifting as well. Here is another example using an array in bash.

Code:
$ declare -a planets=(Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto)
$ i=0; while (( i < ${#planets[@]} )); do echo "${planets[i]}"; ((i++)); done
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto

You can quote either list to see the difference.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

loops?

hello....very new user to unix...and i have a question..i am not sure if there is such a thing For example...the user is asked if he likes Bananas....if he says yes.... echo You like Bananas $name at the end of the script it echos all that the user has entered so they can read it.... but... (1 Reply)
Discussion started by: jonas27
1 Replies

2. Shell Programming and Scripting

Loops within loops

I am running on HPUX using ksh. I have a script that uses a loop within a loop, for some reason the script seems to hang on a particuliar record. The record is fine and hits the condition in Blue. If I kill the 1st loop process the script continues on with no problem. Begin code> <Some... (8 Replies)
Discussion started by: bthomas
8 Replies

3. UNIX for Dummies Questions & Answers

While Loops

I'm trying to create a loop that will prompt the user for 15 values, not forcing them to enter all 15. If the user enters through one or more of the prompts the null value needs to be converted to 0, otherwise set the parameter = to the value entered: ex. Please enter file no #1: 17920 ... (4 Replies)
Discussion started by: vdc
4 Replies

4. UNIX for Dummies Questions & Answers

two loops

Hi, how can I use "for" to have two loops : this is my script : for i in (A B C) do for j in (a b c) do echo $i$j done done #End I want to print out Aa Ab Ac .... But I have error message : syntax error at line 1 : `(' unexpected Many thanks before. How should I use "for" ?? (2 Replies)
Discussion started by: big123456
2 Replies

5. Shell Programming and Scripting

while loops

Hi I've a file like so: Now, I want to read my file and take ex. the Media ID and the Type for each groups of Media (Media1,Media2,...,Media(n): cat /tmp/file|\ while read FILE do while $(FILE|cut -d: -f1)=Media$i do #here will be some test, ex: #if Media ID < 23 ... (4 Replies)
Discussion started by: nymus7
4 Replies

6. UNIX for Dummies Questions & Answers

Help with While Loops

I am traversing down a list, and I am not quite sure how to tell the loop to break when it's done going through the file. #!/bin/sh while : do read list <&3 echo $list done is the code. The file "list" is simply 5 4 3 2 1 any advice on how to break the loop after the file is... (1 Reply)
Discussion started by: MaestroRage
1 Replies

7. Shell Programming and Scripting

Help with the 2 for loops

#!/bin/bash IFS=$'\n' A= a c b t g j i e d B= t y u i o p counter=0 found="" for i in $(cat $A) do for j in $(cat $B) do if then found="yes" fi done if then (1 Reply)
Discussion started by: vadharah
1 Replies

8. Shell Programming and Scripting

Loops

Hi All, I want to execute a script the number of times a user enters. Please can you advise on hor can I do the same. Many Thanks, Shazin (4 Replies)
Discussion started by: Shazin
4 Replies

9. UNIX for Dummies Questions & Answers

loops with tr

Hello, I'm not sure if this is more appropriate for the 'unix for dummies' or the 'unix for experts' forum because I'm new to this forum and this is the second topic I've discussed, but if you could let me know which one was more appropriate for something like this, please do! So in tr (an... (2 Replies)
Discussion started by: juliette salexa
2 Replies

10. UNIX for Dummies Questions & Answers

Need help with for loops

Why wont my for statements work? Im trying to get this script to swich to a user an if you put in a start/stop/or restart paramater to do just that for each user. I commented out the actual start/stop actions to test it just by using echos and not do anything hasty in the environment but it... (0 Replies)
Discussion started by: LilyClaro
0 Replies

LEARN ABOUT DEBIAN

yabause-qt

YABAUSE(1)						      General Commands Manual							YABAUSE(1)

NAME

       yabause - Yet Another Buggy And Uncomplete Saturn Emulator

SYNOPSIS

       yabause [ -afh ] [ -b <BIOS> | -nb ] [ -i <ISO> ] [ --binary=<BINARY>[:<ADDRESS>] ]

DESCRIPTION

       Yabause	is a Sega Saturn emulator. Yabause needs either a bios file, a game or a binary to run.  Games can be loaded from a real cd device
       or from dump files.

OPTIONS

       -a

       --autostart
	      Automatically start emulation.

       -b

       --bios Choose a bios file.

       --binary
	      Use a binary file. Content of the file will be loaded to 0x06004000 and execution will start from that address.  You can provide	an
	      alternative  address  to	load and run the binary with the --binary=<BINARY>:<ADDRESS> syntax.  When using this option, emulation is
	      automatically started and you shouldn't use it in conjunction with -a.  This option is intended for homebrew developers  wanting	to
	      test their programs in Yabause.

       -nb    Use the emulated bios.

FILES

       <BIOS> A Saturn ROM BIOS image.

AUTHORS

       Copyright (c) 2002-2011 Yabause Team

       Web: http://yabause.org

       Please don't ask for roms, bios files or any other copyrighted stuff.

COPYRIGHT

       This  program  is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABIL-
       ITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You  should  have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA

       See the GNU General Public License details in COPYING.

yabause-0.9.11							 November 21, 2011							YABAUSE(1)
All times are GMT -4. The time now is 08:43 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy