In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 28:

  echo usage: `basename "$0"` "[egrep_options] pattern zipfile [members...]"

              ^-------------^ SC2046 (warning): Quote this to prevent word splitting.

              ^-------------^ SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

  echo usage: $(basename "$0") "[egrep_options] pattern zipfile [members...]"

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 36:

opt=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`

    ^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

opt=$(echo "$opt" | sed -e 's/ //g' -e 's/-//g')

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 38:

  *l*) list=1; opt=`echo $opt | sed s/l//`

                   ^---------------------^ SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

                         ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

  *l*) list=1; opt=$(echo "$opt" | sed s/l//)

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 52:

pat=` echo "$pat" | \

    ^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

pat=$( echo "$pat" | \

 sed -e 's/\\\\/\\\\\\\\/g' -e 's/|/\\\|/g' -e 's/&/\\\&/g' )

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 57:

for i in `unzip -Z1 "$zipfile" ${1+"$@"} | sed -e 's/\\\\/\\\\\\\\/g' `; do

         ^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

for i in $(unzip -Z1 "$zipfile" ${1+"$@"} | sed -e 's/\\\\/\\\\\\\\/g' ); do

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 61:

     egrep $opt "$pat" > /dev/null && echo "$i"

     ^---^ SC2196 (info): egrep is non-standard and deprecated. Use grep -E instead.

           ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

     egrep "$opt" "$pat" > /dev/null && echo "$i"

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 67:

     egrep $opt "$pat"

     ^---^ SC2196 (info): egrep is non-standard and deprecated. Use grep -E instead.

           ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

     egrep "$opt" "$pat"

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 72:

    i=` echo "$i" | \

      ^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

    i=$( echo "$i" | \

     sed -e 's/\\\\/\\\\\\\\/g' -e 's/|/\\\|/g' -e 's/&/\\\&/g' )

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 79:

    status_grep=` ( \

                ^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

                                                             ^---^ SC2196 (info): egrep is non-standard and deprecated. Use grep -E instead.

                                                                   ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

    status_grep=$( ( \

     ( unzip -p-L "$zipfile" "$i" | \

     eg"rep "$opt "$pat" 1>&4 ; echo $? >&3 ) 4>&1 | \

     sed "s|^|${i}:|" 1>&4 \

     ) 3>&1 )

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 97:

if test $sts -eq 0 ; then

        ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

if test "$sts" -eq 0 ; then

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/usr/bin/zipgrep line 103:

    exit $sts

         ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

    exit "$sts"

For more information:

  https://www.shellcheck.net/wiki/SC2046 -- Quote this to prevent word splitt...

  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...

  https://www.shellcheck.net/wiki/SC2196 -- egrep is non-standard and depreca...