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## Check if the old archive file exists, if it does, delete it.

Check if the old archive file exists, if it does, delete it.
если создание нового архива завершится с ошибкой, улыбаемся и машем, имея на руках 0 валидных бэкапов?

shellcheck findings

I've run a shellcheck on your script, thought you might be interested in results:

In compress-data.sh line 115:
printout() { [[ $printtype == "l" ]] && printf "$@" || (printf "$@" \
                                     ^-- SC2015: Note that A && B || C is not if-then-else. C may run when A is true.
                                               ^-- SC2059: Don't use variables in the printf format string. Use printf "..%s.." "$foo".
                                                               ^-- SC2059: Don't use variables in the printf format string. Use printf "..%s.." "$foo".


In compress-data.sh line 118:
checkconf() {
^-- SC2120: checkconf references arguments, but none are ever passed.


In compress-data.sh line 135:
  status() { [[ $1 == 1 ]] && echo "$(bold "OK")" || echo "$(bold "NOT OK")"; }
                                   ^-- SC2005: Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.
                                                          ^-- SC2005: Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.


In compress-data.sh line 164:
    confok=1; [[ $debug == 1 ]] && printout "%s Configuration is %s!\n" \
    ^-- SC2034: confok appears unused. Verify it or export it.


In compress-data.sh line 173:
  for ((i=1; i<=$lockwait; i++)); do
                ^-- SC2004: $/${} is unnecessary on arithmetic variables.


In compress-data.sh line 215:
checkconf ## Check configuration.
^-- SC2119: Use checkconf "$@" if function's $1 should mean script's $1.


In compress-data.sh line 241:
     "$(bold $exectime)"
             ^-- SC2086: Double quote to prevent globbing and word splitting.

returned 1

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