In /usr/bin/autopkgtest-build-qemu line 106:
if [ $# -lt 2 -o $# -gt 6 ]; then
              ^-- SC2166: Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.


In /usr/bin/autopkgtest-build-qemu line 162:
    RES=`apt-config shell proxy Acquire::http::Proxy`
        ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
    RES=$(apt-config shell proxy Acquire::http::Proxy)


In /usr/bin/autopkgtest-build-qemu line 164:
        eval $RES
             ^--^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        eval "$RES"


In /usr/bin/autopkgtest-build-qemu line 166:
        RES=`apt-config shell proxy_cmd Acquire::http::Proxy-Auto-Detect`
            ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
        RES=$(apt-config shell proxy_cmd Acquire::http::Proxy-Auto-Detect)


In /usr/bin/autopkgtest-build-qemu line 167:
        eval $RES
             ^--^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        eval "$RES"


In /usr/bin/autopkgtest-build-qemu line 169:
            proxy=`$proxy_cmd`
                  ^----------^ SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
            proxy=$($proxy_cmd)


In /usr/bin/autopkgtest-build-qemu line 172:
    if echo "${proxy:-}" | egrep -q '(localhost|127\.0\.0\.[0-9]*)'; then
                           ^---^ SC2196: egrep is non-standard and deprecated. Use grep -E instead.


In /usr/bin/autopkgtest-build-qemu line 193:
for s in $(dirname $(dirname "$0"))/setup-commands/setup-testbed \
                   ^-------------^ SC2046: Quote this to prevent word splitting.


In /usr/bin/autopkgtest-build-qemu line 249:
trap "rm -rf $vmdb2_config" INT TERM EXIT
             ^-----------^ SC2064: Use single quotes, otherwise this expands now rather than when signalled.

For more information:
  https://www.shellcheck.net/wiki/SC2046 -- Quote this to prevent word splitt...
  https://www.shellcheck.net/wiki/SC2064 -- Use single quotes, otherwise this...
  https://www.shellcheck.net/wiki/SC2166 -- Prefer [ p ] || [ q ] as [ p -o q...