Puis-je créer un raccourci/alias de bureau vers un dossier à partir du terminal ?

Il est possible de le faire en une seule ligne de Terminal. Disons que vous voulez aliaser le fichier "/Users/me/Library/Preferences/org.herf.Flux.plist".

osascript -e 'tell application "Finder"' -e 'make new alias to file (posix file "/Users/me/Library/Preferences/org.herf.Flux.plist") at desktop' -e 'end tell'

Vous devez remplacer to file avec to folder si vous avez un dossier.

Voici un shell script qui vous permet de passer dans un fichier ou un chemin de dossier pour créer l'alias :

#!/bin/bash

if [[ -f "$1" ]]; then
  type="file"
else
  if [[ -d "$1" ]]; then 
    type="folder"
  else
    echo "Invalid path or unsupported type"
    exit 1
  fi
fi

osascript <<END_SCRIPT
tell application "Finder"
   make new alias to $type (posix file "$1") at desktop
end tell
END_SCRIPT

Si vous nommez ce script make-alias.sh , chmod u+x make-alias.sh et le mettre dans /usr/local/bin vous pouvez, par exemple, exécuter make-alias.sh ~/Library/Preferences .

#!/bin/bash

get_abs() {
  # $1 : relative filename
  echo "$(cd "$(dirname "$1")" && pwd)/$(basename "$1")"
}

if [[ $# -ne 2 ]]; then
    echo "mkalias: specify 'from' and 'to' paths" >&2
    exit 1
fi

from=$(eval get_abs $1)  
todir=$(dirname $(eval get_abs $2))
toname=$(basename $(eval get_abs $2))
if [[ -f "$from" ]]; then
    type="file"
elif [[ -d "$from" ]]; then
    type="folder"
else
    echo "mkalias: invalid path or unsupported type: '$from'" >&2
    exit 1
fi

osascript <<EOF
tell application "Finder"
   make new alias to $type (posix file "$from") at (posix file "$todir")
   set name of result to "$toname"
end tell
EOF

Si vous devez cibler le lien vers un dossier spécifique (ou lui donner un nom spécifique), vous pouvez utiliser la fonction set name of result to "…" dans le cas de

#!/bin/bash

if [[ $# -ne 2 ]]; then
    echo "mkalias: specify 'from' and 'to' paths" >&2
    exit 1
fi

from="$(realpath $1)"
todir="$(dirname $(realpath $2))"
toname="$(basename $(realpath $2))"
if [[ -f "$from" ]]; then
    type="file"
elif [[ -d "$from" ]]; then
    type="folder"
else
    echo "mkalias: invalid path or unsupported type: '$from'" >&2
    exit 1
fi

osascript <<EOF
tell application "Finder"
   make new alias to $type (posix file "$from") at (posix file "$todir")
   set name of result to "$toname"
end tell
EOF

Pour les personnes qui souhaiteraient une solution Python, voici une fonction enveloppant applescript, puis appelant subprocess.call :

def applescript_finder_alias(theFrom, theTo):
    """
    (theFrom, theTo)
    create a short/alias
    theFrom, theTo: relative or abs path, both folder or both file
    """
    # https://apple.stackexchange.com/questions/51709
    applescript = '''
    tell application "Finder"
       make new alias to %(theType)s (posix file "%(theFrom)s") at (posix file "%(todir)s")
       set name of result to "%(toname)s"
    end tell
    '''
    def myesp(cmdString):
        import os, inspect, tempfile, subprocess
        caller = inspect.currentframe().f_back
        cmd =  cmdString % caller.f_locals

        fd, path = tempfile.mkstemp(suffix='.applescript')
        try:
            with os.fdopen(fd, 'w') as tmp:
                tmp.write(cmd.replace('"','\"').replace("'","\'")+'\n\n')
            subprocess.call('osascript ' + path, shell=True, executable="/bin/bash")
        finally:
            os.remove(path)
        return None
    import os
    theFrom = os.path.abspath(theFrom)
    theTo = os.path.abspath(theTo)
    if os.path.isfile(theFrom): 
        theType = 'file'
    else:
        theType = 'folder'
    todir = os.path.dirname(theTo)
    toname = os.path.basename(theTo)
    myesp(applescript)