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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 CENTOS

zip_source_file

ZIP_SOURCE_FILE(3)					     Library Functions Manual						ZIP_SOURCE_FILE(3)

NAME

       zip_source_file - create data source from a file

LIBRARY

       libzip (-lzip)

SYNOPSIS

       struct zip_source * zip_source_file(struct zip *archive, const char *fname); "zip_uint64_t start" "zip_int64_t len"

DESCRIPTION

       The  function zip_source_file creates a zip source from a file.	zip_source_file opens fname and reads len bytes from offset start from it.
       If len is 0 or -1, the whole file (starting from start ) is used.

       The fie is opened and read when the data from the source is used, usually by zip_close.

RETURN VALUES

       Upon successful completion, the created source is returned.  Otherwise, NULL is returned and the error code in archive is set  to  indicate
       the error.

ERRORS

       zip_source_file fails if:

	      [ZIP_ER_INVAL]
		  fname, start, or len are invalid.

	      [ZIP_ER_MEMORY]
		  Required memory could not be allocated.

	      [ZIP_ER_OPEN]
		  Opening fname failed.

SEE ALSO

       libzip(3),    zip_add(3),    zip_replace(3),   zip_source_buffer(3),   zip_source_filep(3),   zip_source_free(3),   zip_source_function(3),
       zip_source_zip(3)

AUTHORS

       Dieter Baron <dillo@giga.or.at> and Thomas Klausner <tk@giga.or.at>

NiH								  August 1, 2008						ZIP_SOURCE_FILE(3)
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