cp command: Overwrite confirmation with file diff
Solution 1:
Placing alias commands in your bash profile will gain you partial overwrite protection. As others mentioned in your comments, you will need to write a script add the diff function.
I placed the commands below in my ~/.bash_profile
.
Bash on macOS determines what file is your bash profile in this order:
~/.bash_profile
~/.bash_login
~/.profile
These commands tell cp, mv and rm to give you a warning when a file is to be overwritten or deleted:
alias cp='cp -i'
alias mv='mv -i'
alias rm='rm -i'
# Placing a blank after sudo causes alias substitution
# for sudo's inner commands . See Gordon Davisson's comments below for
# details.
alias sudo='sudo '
This example, assumes you have placed the above commands in your bash profile.
mac $ touch a
mac $ touch aa
mac $ cp aa a
overwrite a? (y/n [n]) n
not overwritten
mac RC=1 😱 $ rm a
remove a?
mac $ mv aa a
overwrite a? (y/n [n]) n
not overwritten
# demonstrate sudo protection
mac $ touch inin
mac $ sudo cp inin hihi
overwrite hihi? (y/n [n]) n
not overwritten
mac RC=1 😱 $ sudo mv inin hihi
overwrite hihi? (y/n [n]) n
not overwritten
mac $ sudo rm inin hihi
remove inin? y
remove hihi? y
mac $
These alias command do not protect you in all circumstances like when you invoke a new shell or run cp, mv or rm from within other commands like find.
P.S.: The aliases mentioned above use the same name as the original command, thereby shadowing it. To access the original un-aliased command, prepend it with a \
character (E.g., \cp
, \mv
, \rm
etc.).