This is probably a very simple thing but I can’t find an answer, possibly because I don’t know what terms to use in search.
How do I use an alias of a path with mv or cp? Or even cd?
In /etc/bash.bashrc I have:
alias docs=‘/media/docs
cd docs
Gives “No such file or directory”
Yet:
docs
Gives “Is directory”
With alias docs=‘cd /media/docs’ and by typing docs I get into the directory. Obviously I can’t use that alias with mv or cp though.
Maybe this isn’t even an intended use of alias but still. Why doesn’t it work?
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As already pointed out in other comments here,
aliasis used specifically to define a new shell command and in order to define some arbitrary text substitution to be used anywhere in a commandline you’ll need to use a variable instead, but for the specific case ofcdthere’s also a feature calledCDPATHthat you might be interested in learning about:https://writesoftwarewell.com/cdpath-easily-navigate-directories-in-the-terminal
aliasis for aliasing commands. If you want to “alias“ arguments, use shell/environment variables.$ docs=/media/docs $ cd $docsIt is worth acknowledging that this probably seems unintuitive to a new user. Makes it look like the shell has two different aliasing systems.
It makes sense the more familiar you are with bash, though. If you ever tried to
cd /some/other/path-with-docs/in/the/stringyou’d end up accidentally runningcd /some/other/path-with-/media/docs/in/the/string.Which would be confusing at best, or a security issue at worst. Better to see that
in the cmd and know you’re injecting a var’s value.New users should try to take a little time to read the basics, not suppose things then ask strangers in the internet.
It might be excessive for your purposes but an alternative may be to use zoxide. It learns the directories you use regularly and you can then cd to those directories through the
zcommand. E.g.z docs.You might find a symbolic link useful. For example
ln -s /media/docs ~/docsNow you’ll have a “folder” in your home directory named “docs” that points to “/media/docs”. You can use that path with commands like mv or cp.
These commands now both move “myfile” to the same location
mv myfile ~/docs mv myfile /media/docsThanks, but the problem with this is that I’ll type /media/docs/whatever much faster than hunt the ~ from my keyboard because I have to move my whole hand to do so.
It’s altGr + ^ on my keyboard.
Highly recommend remapping common characters to easy-to-access hand movements. The keyboard is a tool to make things easier. I never use caps-lock, but I use esc all the time, so I regularly swap them (or just have a second esc bind).
That sounds inconvenient. I use ~ all the time. $HOME should point to the same dir in most cases though
Unfortunately $ also requires pressing the damned AltGr.
I’d have to buy a new keyboard at that point
have you looked at remapping a couple keys?
I bound ~/ to one of my keyboards G-keys. Still not optimal placement wise but way better than the AltGr-route.
You should be using a variable not an alias.
Variables in bash have a few sharp edges; one of which is that spaces act as a delimiter and turn the variable into a list.
The other being that sometimes escaping and unescaping the contents of a variable can be stupidly tricky. This is why a lot of people who use bash do not like spaces in directory or file names.
Thanks for the tip, but escaping and unescaping sounds tedious, since I use spaces in both directory and file names.
What I like about aliases here is that I have one central location to set them up and change them. If I ever were to forget what aliases I have it’s just about opening the file and looking.
eh, it’s mostly automagic but the first few times you encounter it makes for some fun debugging.
Play around with the
var=$(ls -A)construction a bit and see what is happening with your files.
By default bash will only expand an alias if it’s the first argument of the command (that is, the command itself).
It’s probably not intended to use aliases this way, and there are probably better options for you.
However, there is a little trick you can do. If the alias command ends in a space, then bash will also check the next argument:
alias cd='cd 'Notice the trailing space after ‘cd’ in the alias definition.
alias docs='/media/docs'then,
cd docsshould work the way you expect.Another method would be to:
alias docs='echo /media/docs'Then you can do
cd `docs`The backticks will cause the shell to replace that portion with the output of the docs shell command, which will be expanded via the alias.
All that said, it’s probably easiest just to use a link, like another commenter suggested.
Cursed knowledge.
This is a bad idea for a number of reasons. Instead, if you move files to a specific location frequently, you want to make a symbolic link to that location instead. It acts as a circuit breaker in case something about your environment changes or breaks.
You might consider looking into other shells. Fish has things such as nor requiring escaping variables with spaces and defining abbreviations that can work anywhere in a command line.
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