Suppose you have an alias on you .bashrc alias shutdown="sudo shutdown -h now" and you would like to confirm the execution.
The following script executes any console, alias or gui program with an extra dialog before execution.
Usage:
tkdialog shutdown
Make sure to 'chmod +x' and put the file into you executables path like /usr/local/bin.
Here is the code:
#!/usr/bin/env tclsh package require Tk wm withdraw . bind . <Escape> {exit} if {[tk_messageBox -type yesno -icon question\ -message "Do you really want to $argv?" -parent .] eq "yes"} { catch {exec $env(SHELL) -i -c $argv} } exit