Values rotation in array with bash Post: 303035341

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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

Registered User

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

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qmail-start

qmail-start(8)                                                System Manager's Manual                                               qmail-start(8)

NAME

       qmail-start - turn on mail delivery

SYNOPSIS

       qmail-start [ defaultdelivery [ logger arg ...  ] ]

DESCRIPTION

       qmail-start  invokes qmail-send, qmail-lspawn, qmail-rspawn, and qmail-clean, under the proper uids and gids.  These four daemons cooperate
       to deliver messages from the queue.

       qmail-start arranges for qmail-send's activity record to be sent to qmail-start's output.  See qmail-log(5) for the format of the  activity
       record.  Other than this, qmail-start does not print anything, even on failure.

       If defaultdelivery is supplied, qmail-start passes it to qmail-lspawn.

       If logger is supplied, qmail-start invokes logger with the given arguments, and feeds qmail-send's activity record through logger.

       Environment variables given to qmail-start will eventually be passed on to qmail-local, so make sure to clean up the environment if you run
       qmail-start manually:

          # env - PATH="/var/lib/qmail/bin:$PATH"
          qmail-start ./Mailbox splogger qmail &
          (all on one line)

       Resource limits, controlling ttys, et al. are also passed from qmail-start to qmail-local.

       Note that qmail-send normally juggles several simultaneous deliveries.  To reduce qmail-send's impact on other programs, you can run qmail-
       start with a low priority.

SEE ALSO

       logger(1), splogger(1), nice(1), qmail-log(5), qmail-local(8), qmail-clean(8), qmail-lspawn(8), qmail-rspawn(8), qmail-send(8)

                                                                                                                                    qmail-start(8)