36

I frequently run the ls command after running the cd command. How can I create an alias (like cs) for this operation?

Eliran Malka
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dv3500ea
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6 Answers6

38

From Bash Tips and Tricks: 'cd' with style:

Finally, I want to show you how to write your own custom replacement for the 'cd' command.

Do you find yourself always typing the same thing upon changing into a directory? You probably at least list the files there every time, perhaps so much that your hands automatically type 'ls' after every 'cd'.

Well, by trying every way I could think of, it turns out there's only one way to properly accomplish the goal we're seeking. We have to create a shell function.

Shell functions are part of shell programming. Like in compiled programming languages, functions provide a sort of procedural modularizability. One can create a generic function to perform an often-used bit of logic or computation with different parameters. In this case, the parameter is the current working directory.

Here's a simple one:

function cs () {
    cd $1
    ls
}

As @geirha corretly notes, the above function will fail if you try to switch to a directory with a space in its name: 

$ cs A\ B/
-bash: cd: A: No such file or directory
<current directory listing>

You should instead use the following function: 

function cs () {
    cd "$@" && ls
    }

Once you add that code to your ~/.bashrc, you should be able to do this: 

hello@world:~$ cs Documents/
example.pdf tunafish.odt
hello@world:~/Documents$
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Isaiah
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    That'll fail for directories containing whitespace. See the comment to dv3500ea's answer. – geirha Feb 02 '11 at 08:15
28

You can use the builtin command in bash :

function cd() {
    new_directory="$*";
    if [ $# -eq 0 ]; then 
        new_directory=${HOME};
    fi;
    builtin cd "${new_directory}" && ls
}
dino
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OneOfOne
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    This is pretty slick. I had a solution similar to @Florian in my .bashrc for a very long time, but this is much more satisfactory for when I forget that colleagues don't have my 'cs' alias on their computers. – dino Oct 01 '12 at 12:45
  • I like this answer the best. For some reason, you can't use aliases to overwrite the command, so you have to make a function like this answer. :D – trusktr Oct 30 '12 at 20:45
  • But what about non-builtin commands? For example, the above won't work for overwriting the ls command. Is there some keyword to use instead of "builtin"? – trusktr Oct 30 '12 at 20:52
  • use the full path for it, example : function ls() { /usr/bin/ls $* } – OneOfOne Oct 31 '12 at 17:40
  • I had problems redefining cd because rvm changes my cd definition too. See http://stackoverflow.com/a/19941991/1601989 – DavidGamba May 21 '14 at 10:22
17

Use a function instead of an alias:

cs() { cd "$1" && ls; }
Stefano Palazzo
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Florian Diesch
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8

Thanks Florian Diesch for the tip of using a function. I can't use cs as the name because there is a cs command in the csound package, so I used lc.

I added this to ~/.bash_aliases (nano ~/.bash_aliases):

function lc () {
    cd $1;
    ls 
}

The terminal needs to be reset for this to come into effect.

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dv3500ea
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    Having $1 unquoted like that will make it fail if the directory contains whitespace. Also, you should check the return value of cd; if it failed (e.g. permission denied), there's no point in running the ls. lc() { cd "$@" && ls; } – geirha Feb 02 '11 at 08:13
1

As an expansion to this function: cs() { cd "$1" && ls; }, you may want to pass all of the function's arguments to cd by using $@ instead of "$1" as such: cs() { cd $@ && ls; }.

1

I had problems redefining cd because rvm changes my cd definition too. See https://stackoverflow.com/a/19941991/1601989. I didn't really want to use builtin because that would skip whatever rvm is doing.

I added the following to my .bashrc:

# cdd allows you to cd to the directory of the given file or directory
function cdd()
{
  if [[ $# -eq 0 ]]; then
    cd
  elif [[ -d "$*" ]]; then
    cd "$*"
  elif [[ -f "$*" ]]; then
    echo "WARNING: file given, cd to file's dirname" 1>&2
    local dir=$(dirname "$*")
    cd "$dir"
  else
    cd "$*"
  fi
}

function cs()
{
  cdd $* && ls
}

And then after the rmv line in the .bashrc:

alias cd='cdd'
# Use bash built in completion for cd to allow for filenames to be used
complete -r cd
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DavidGamba
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