Values rotation in array with bash Post: 303035322

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Homework and Emergencies Homework & Coursework Questions Values rotation in array with bash Post 303035322 by RudiC on Tuesday 21st of May 2019 06:39:40 AM

Old

05-21-2019

Registered User

You seem to have some logical errors in your script:
- mixing up array indices with array values (tmp being assigned a value but then used for an index).

- using a constant (2) when the shift span (n) is given.
- outputting the modified array twice instead of comparing the two before and after

How about

Code:

$ array=( $(seq 1 "$box"))
$ echo " Original array : " ${array[*]}
 Original array :  1 2 3 4 5 6 7 8 9 10
$ echo " shift:" $n
 shift: 4
$ array=( $(for ((i=n; i; i--)); do echo -n  ${array[-i]}" "; unset array[-i];  done; echo ${array[@]}) )
$ echo " array shifted : " ${array[*]}
 array shifted :  7 8 9 10 1 2 3 4 5 6

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bashbug

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
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       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)