Make this project POSIX Compliant

[calebe94]

Expected Behavior

Make this project POSIX Compliant.

• ShellCheck – shell script analysis tool ;
• 24 Bashism To Avoid for POSIX-Compliant Shell Scripts;
• POSIX compliant shell scripting - HLRS Platforms
• GitHub - koalaman/shellcheck: ShellCheck, a static analysis tool for shell scripts

Current Behavior

Log from shellcheck:

In dmenu_tbm line 23:
DMENU_ARGS=$@
           ^-- SC2124: Assigning an array to a string! Assign as array, or use * instead of @ to concatenate.


In dmenu_tbm line 41:
    selection=$(echo "$actions" | dmenu -p "$bookmark" $DMENU_ARGS)
                                                       ^---------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
    selection=$(echo "$actions" | dmenu -p "$bookmark" "$DMENU_ARGS")


In dmenu_tbm line 42:
    if [ ! -z "$selection" ]; then
         ^-- SC2236: Use -n instead of ! -z.


In dmenu_tbm line 46:
                [ -z "$url" ] && echo "No url given!" | dmenu -p "Error" $DMENU_ARGS || xdg-open "$url"
                              ^-- SC2015: Note that A && B || C is not if-then-else. C may run when A is true.
                                                                         ^---------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
                [ -z "$url" ] && echo "No url given!" | dmenu -p "Error" "$DMENU_ARGS" || xdg-open "$url"


In dmenu_tbm line 53:
                choice=$(echo "no\nyes" | dmenu -p "Are you sure?" $DMENU_ARGS)
                              ^-------^ SC2028: echo may not expand escape sequences. Use printf.
                                                                   ^---------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
                choice=$(echo "no\nyes" | dmenu -p "Are you sure?" "$DMENU_ARGS")


In dmenu_tbm line 56:
                    [ -z "$id" ] && echo "No id given!" | dmenu -p "Error" $DMENU_ARGS || tbm -d "$id"
                                 ^-- SC2015: Note that A && B || C is not if-then-else. C may run when A is true.
                                                                           ^---------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
                    [ -z "$id" ] && echo "No id given!" | dmenu -p "Error" "$DMENU_ARGS" || tbm -d "$id"


In dmenu_tbm line 76:
    selection=$(echo "$bookmarks" | dmenu -p "Bookmarks" $DMENU_ARGS)
                                                         ^---------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
    selection=$(echo "$bookmarks" | dmenu -p "Bookmarks" "$DMENU_ARGS")


In dmenu_tbm line 77:
    if [ ! -z "$selection" ]; then
         ^-- SC2236: Use -n instead of ! -z.


In dmenu_tbm line 81:
            [ -z "$status" ] && echo "No url on clipboard!" | dmenu -p "Error" $DMENU_ARGS || echo "$status"
                                                                               ^---------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
            [ -z "$status" ] && echo "No url on clipboard!" | dmenu -p "Error" "$DMENU_ARGS" || echo "$status"

For more information:
  https://www.shellcheck.net/wiki/SC2124 -- Assigning an array to a string! A...
  https://www.shellcheck.net/wiki/SC2015 -- Note that A && B || C is not if-t...
  https://www.shellcheck.net/wiki/SC2028 -- echo may not expand escape sequen...

Possible Solution

Steps to Reproduce

Context (Environment)

Detailed Description

Possible Implementation