bash execute a shell function after a change directory (cd)

Question

Trying to find a way to execute a function within BASH after changing into a directory.

for example,

# cd code/project/blah
"Your latest modified files are main.cc blah.hpp blah.cc"
(~/code/project/blah) # _

With the above I'm hoping to be able to wrap other functionality around the bash command.

Was hoping to find something along the lines of zsh hook functions http://zsh.sourceforge.net/Doc/Release/Functions.html#SEC45

Answer 1

You could make an alias for cd which executes the standard cd and then some function that you've defined.

Answer 2

alias cd='echo DO SOME WORK; cd $*'

Answer 3

Use PROMPT_COMMAND. You should have a look at git-sh, which includes a lot of fancy git-related tricks and should also be easy to learn from.

Answer 4

Don't forget about pushd and popd, unless you never use them. I'd do this:

PS1='(\w) \$ '
chdir() {
    local action="$1"; shift
    case "$action" in
        # popd needs special care not to pass empty string instead of no args
        popd) [[ $# -eq 0 ]] && builtin popd || builtin popd "$*" ;;
        cd|pushd) builtin $action "$*" ;;
        *) return ;;
    esac
    # now do stuff in the new pwd
    echo Your last 3 modified files:
    ls -t | head -n 3
}
alias cd='chdir cd'
alias pushd='chdir pushd'
alias popd='chdir popd'