In scripts/linkFiles.sh line 8:
    if [[ -f "$2" ]]; then
       ^-----------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 9:
        if [ "$skip_all" == "true" ]; then
                         ^-- SC3014 (warning): In POSIX sh, == in place of = is undefined.


In scripts/linkFiles.sh line 11:
        elif [ "$overwrite_all" == "true" ]; then
                                ^-- SC3014 (warning): In POSIX sh, == in place of = is undefined.


In scripts/linkFiles.sh line 13:
        elif [ "$backup_all" == "true" ]; then
                             ^-- SC3014 (warning): In POSIX sh, == in place of = is undefined.


In scripts/linkFiles.sh line 22:
            if [ $selectedOption -eq 1 ]; then
                 ^-------------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
            if [ "$selectedOption" -eq 1 ]; then


In scripts/linkFiles.sh line 24:
            elif [ $selectedOption -eq 2 ]; then
                   ^-------------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
            elif [ "$selectedOption" -eq 2 ]; then


In scripts/linkFiles.sh line 27:
            elif [ $selectedOption -eq 3 ]; then
                   ^-------------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
            elif [ "$selectedOption" -eq 3 ]; then


In scripts/linkFiles.sh line 29:
            elif [ $selectedOption -eq 4 ]; then
                   ^-------------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
            elif [ "$selectedOption" -eq 4 ]; then


In scripts/linkFiles.sh line 32:
            elif [ $selectedOption -eq 5 ]; then
                   ^-------------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
            elif [ "$selectedOption" -eq 5 ]; then


In scripts/linkFiles.sh line 54:
    for srcFile in $(find -H "$DOTFILES" -not -path '*.git' -not -path '*.config*' -not -path '*.ssh*' -not -path '*.icons*' -not -path '*.local*' -not -path '*other*'); do
                   ^-- SC2044 (warning): For loops over find output are fragile. Use find -exec or a while read loop.


In scripts/linkFiles.sh line 59:
        if [[ -f "$srcFile" ]]; then
           ^-----------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 65:
        for srcFile in $(find -H "$initialFolder"); do
                       ^-------------------------^ SC2044 (warning): For loops over find output are fragile. Use find -exec or a while read loop.


In scripts/linkFiles.sh line 66:
            if [[ -d "$srcFile" ]]; then
               ^-----------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 69:
                if [[ ! -d "$HOME/$var" ]]; then
                   ^---------------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 74:
            if [[ -f "$srcFile" ]]; then
               ^-----------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 91:
    sudo bash -c "$(declare -f runDetachedScript); $(declare -f linkFile); "runDetachedScript" "$dialogBox""
                    ^--------------------------^ SC3044 (warning): In POSIX sh, 'declare' is undefined.
                                                     ^-----------------^ SC3044 (warning): In POSIX sh, 'declare' is undefined.
                                                                            ^---------------^ SC2140 (warning): Word is of the form "A"B"C" (B indicated). Did you mean "ABC" or "A\"B\"C"?
                                                                                                ^--------^ SC2027 (warning): The surrounding quotes actually unquote this. Remove or escape them.
                                                                                                ^--------^ SC2154 (warning): dialogBox is referenced but not assigned.
                                                                                                ^--------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 
    sudo bash -c "$(declare -f runDetachedScript); $(declare -f linkFile); "runDetachedScript" ""$dialogBox"""


In scripts/linkFiles.sh line 95:
    source scripts/common.sh
    ^----------------------^ SC3046 (warning): In POSIX sh, 'source' in place of '.' is undefined.
           ^---------------^ SC1091 (info): Not following: scripts/common.sh was not specified as input (see shellcheck -x).


In scripts/linkFiles.sh line 100:
    for srcFile in $(find -H "$DOTFILES_OTHER"); do
                   ^--------------------------^ SC2044 (warning): For loops over find output are fragile. Use find -exec or a while read loop.


In scripts/linkFiles.sh line 101:
        if [[ -d "$srcFile" ]]; then
           ^-----------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 104:
            if [[ ! -d "/$var" ]]; then
               ^----------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 109:
        if [[ -f "$srcFile" ]]; then
           ^-----------------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In scripts/linkFiles.sh line 117:
    source scripts/common.sh
    ^----------------------^ SC3046 (warning): In POSIX sh, 'source' in place of '.' is undefined.
           ^---------------^ SC1091 (info): Not following: scripts/common.sh was not specified as input (see shellcheck -x).

For more information:
  https://www.shellcheck.net/wiki/SC2027 -- The surrounding quotes actually u...
  https://www.shellcheck.net/wiki/SC2044 -- For loops over find output are fr...
  https://www.shellcheck.net/wiki/SC2140 -- Word is of the form "A"B"C" (B in...