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is there any way (what is the easiest way in bash) to combine the following:

mkdir foo
cd foo

The manpage for mkdir does not describe anything like that, maybe there is a fancy version of mkdir? I know that cd has to be shell builtin, so the same would be true for the fancy mkdir...

Aliasing?

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marked as duplicate by Stéphane Chazelas, Mikel, slm, Bernhard, jasonwryan Apr 18 '14 at 19:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
You can't alias two commands together directly. – goldilocks Apr 18 '14 at 14:05
1  
Yes, seems to be a duplicate. Anything to do for me about that? – Jasper Apr 18 '14 at 16:21
1  
Nope, just wait for it to be closed. Do not delete it, as being a different wording, it may still be useful for people searching the same based on terms in your question. – Stéphane Chazelas Apr 18 '14 at 16:52
up vote 23 down vote accepted

Function?

mkcdir ()
{
    mkdir -p -- "$1" &&
      cd -P -- "$1"
}
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1  
quotes around "$1" will protect the argument if it has spaces. – glenn jackman Apr 18 '14 at 13:33
2  
and put this in .bashrc? – Jasper Apr 18 '14 at 14:05
    
exactly ;) ... no big deal – Ouki Apr 18 '14 at 14:25
    
@glenn jackman: thanks for the "$1" – Ouki Apr 18 '14 at 14:26

I think creating a function is the most appropriate way to do this, but just for listing all alternative ways, you could write:

mkdir foo && cd "$_"

$_is a special parameter that holds the last argument of the previous command. The quote around $_ make sure it works even if the folder name contains spaces.

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1  
Neat, learned something new again! – Lekensteyn Apr 19 '14 at 13:31

Bash (using word designators):

/tmp/bug$ mkdir "some dir"
/tmp/bug$ cd !$
cd "some dir"
/tmp/bug/some dir$ 

!$ expands to the last argument of the previous line in the history. If you have parameters in between, then you can use !:1 for the first argument, !:2 forthe second argument, etc.

From bash(1):

Event Designators

An event designator is a reference to a command line entry in the history list. Unless the reference is absolute, events are relative to the current position in the history list.

! Start a history substitution, except when followed by a blank, newline, carriage return, = or ( (when the extglob shell option is enabled using the shopt builtin).

[..]

Word Designators

Word designators are used to select desired words from the event. A : separates the event specification from the word designator. [..]

[..]
n The n-th word.
^ The first argument. That is, word 1.
$ The last word. This is usually the last argument, but will expand to the zeroth word if there is only one word in the line.

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I think that "!:1" loses vs "$firstfewcharactersofnewdir+TAB" in most cases... – Jasper Apr 18 '14 at 14:19
    
@Jasper I seldomly use !:1, but it is an option if you have a path with a non-unique prefix. – Lekensteyn Apr 18 '14 at 14:34
2  
!$ is shorter and easier to type on many keyboards. See also <Alt-.> or <Alt-_> – Stéphane Chazelas Apr 18 '14 at 14:51
    
@StephaneChazelas Nice one, I'll update the answer to use !$ instead. – Lekensteyn Apr 18 '14 at 15:06
    
@StephaneChazelas What is the difference between Alt+. and Alt+_? – Bernhard Apr 18 '14 at 19:03

These other lads are just making life complicated, here it is:

eval {mkdir,cd}\ FOLDER\;
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I really wanted to make a directory called 'FOLDER && rm ../something'. But eval won't let me :*( Tragically, may have to choose complicated in the battle of complicated vs evil. – BroSlow Apr 19 '14 at 2:14
    
@BroSlow, well then you'll have to find another OS, since having a slash in a filename has never been allowed! as for the other characters they work just fine if escaped. – Sean D Apr 19 '14 at 10:20
1  
@SeanD You're missing my point. Using eval with user input is generally a bad idea and eval will process FOLDER && rm ../something in place of FOLDER without complaint. Or for another variant, how about "FOLDER && rm -r $HOME" – BroSlow Apr 19 '14 at 17:28
    
@BroSlow, using microwaves is generally a bad idea too, since you might put in tinfoil. – Sean D Apr 20 '14 at 9:30
1  
@MilesRout If you only ever use it for a directory called FOLDER, sure, this is fine. That's not the point, if you use it with variable input (which you almost certainly are going to), the results for weird directory names can at best cause unexpected results, at worst pose a security risk. – BroSlow Feb 1 at 1:36

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