You need to use the
--working-directory option. So
will open the terminal with the current directory set to
Regarding having clickable files the open
lxterminal in different working directories, create four different (executable) scripts, which open
lxterminal in the required directories and save them to your desktop. So
lxterminal terminal --working-directory=/path/to/dir1
lxterminal terminal --working-directory=/path/to/dir2
and so on.
See the the
lxterminal man page.
To make the script executable, there is no need for a specific file extension, although
.sh is sometimes used1. Use the command
chmod 755 <scriptname>, or
chmod +x <scriptname> on the scripts. So, if the path to your script is
chmod +x /home/pi/Desktop/myscript
1 Note that the extension
.sh will not make the file excutable, it is merely a sometimes used convention, to denote that the file contains a (sh) script.