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Full Discussion: Values rotation in array with bash
Homework and Emergencies Homework & Coursework Questions Values rotation in array with bash Post 303035341 by MadeInGermany on Tuesday 21st of May 2019 03:03:03 PM
Old 05-21-2019
Comment on the previous solution: it allows echo ${array[-i]} because the =( ) splits on IFS i.e. space and newline.

If there is a cyclic shift, the % operator (modulo) is nice!
The following allows a very big (and even negative) shift:

Code:
...
# print array[ ] right-shifted by n
print_array_shifted(){
  local len=${#array[@]}
  local start=$((10*len-n))
  local end=$((start+len))
  local i
  for ((i=start; i<end; i++))
  do
    echo "${array[i%len]}"
  done
}

echo " Original array : ${array[*]}"
array=( $(print_array_shifted) )
echo " Array shifted : ${array[*]}"

Last edited by MadeInGermany; 05-27-2019 at 01:24 PM.. Reason: 10*len because bash-3 does not allow negative index
These 2 Users Gave Thanks to MadeInGermany For This Post:
Nexy RudiC
 

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LEARN ABOUT FREEBSD

catman.local

MAKEWHATIS.LOCAL(8)					    BSD System Manager's Manual 				       MAKEWHATIS.LOCAL(8)

NAME

     makewhatis.local, catman.local -- start makewhatis or catman for local file systems

SYNOPSIS

     /usr/libexec/makewhatis.local [options] directories ...
     /usr/libexec/catman.local [options] directories ...

DESCRIPTION

     The makewhatis.local utility starts makewhatis(1) only for file systems physically mounted on the system where the makewhatis.local is being
     executed.	Running makewhatis by periodic weekly for rw nfs-mounted /usr may kill your NFS server -- all NFS clients start makewhatis at the
     same time!  So use this wrapper for cron(8) instead of calling makewhatis directly.  The catman.local utility is using for same purposes as
     makewhatis.local but for catman(1).

FILES

     /etc/periodic/weekly/320.whatis	  run makewhatis.local every week
     /etc/periodic/weekly/330.catman	  run catman.local every week

SEE ALSO

     catman(1), find(1), makewhatis(1), cron(8), periodic(8)

HISTORY

     The makewhatis.local utility appeared in FreeBSD 2.2.

BSD
								  April 26, 1996							       BSD
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