How do I pass the command line arguments to an alias? Here is a sample:
alias mkcd='mkdir $1; cd $1;'
But in this case the $xx is getting translated at the alias creating time and not at runtime. I have, however, created a workaround using a shell function (after googling a little) like below:
function mkcd(){
mkdir $1
cd $1
}
Just wanted to know if there is a way to make aliases that accept CL parameters.
BTW - I use 'bash' as my default shell.
Just to reiterate what has been posted for other shells, in Bash the following works:
alias blah='function _blah(){ echo "First: $1"; echo "Second: $2"; };_blah'
Running the following:
blah one two
Gives the output below:
First: one
Second: two
Bash to replace $1 and $2 with the parameters passed to the function. Single quotes tell Bash not to do this.
function blah(){ echo "First: $1"; echo "Second: $2"; }You found the way: create a function instead of an alias. The C shell has a mechanism for doing arguments to aliases, but bash and the Korn shell don't, because the function mechanism is more flexible and offers the same capability.
.bashrc file. For example # create an alias that takes port-number by the user alias serve="python -m SimpleHTTPServer $1" After making the change in the .bashrc file, make sure you enter the following command. ~$ source .bashrc You should be able to use this like so ~$ serve 8998
You cannot in ksh, but you can in csh.
alias mkcd 'mkdir \!^; cd \!^1'
In ksh, function is the way to go. But if you really really wanted to use alias:
alias mkcd='_(){ mkdir $1; cd $1; }; _'
csh is usually not what a modern person should want to use. The alias-which-creates-a-function-then-executes-that-function indirection is relatively popular, but offers no benefit over a proper function as far as I can tell. (The function should properly quote its argument, anyway.) Downvoting.To quote the bash man page:
There is no mechanism for using arguments in the replacement text. If arguments are needed, a shell function should be used (see FUNCTIONS below).
So it looks like you've answered your own question -- use a function instead of an alias
You may also find this command useful:
mkdir dirname && cd $_
where dirname is the name of the directory you want to create
$_ is the output of the last command unix.stackexchange.com/a/271693/169772The easiest way, is to use function not alias. you can still call a function at any time from the cli. In bash, you can just add function name() { command } it loads the same as an alias.
function mkcd() { mkdir $1; cd $1 ;}
Not sure about other shells
function keyword is permitted by Bash (and Ksh) but doesn't really serve any useful purpose here. The portable syntax is simply mkcd () { mkdir "$1"; cd "$1"; } (notice also the fixed quoting).I found that functions cannot be written in ~/.cshrc file. Here in alias which takes arguments
for example, arguments passed to 'find' command
alias fl "find . -name '\!:1'"
Ex: >fl abc
where abc is the argument passed as !:1
!:1 meant. I had to scroll down to see here that it was the argument. A good answer doesn't leave more questions, even if it wasn't for the OPs shell type.You actually can't do what you want with Bash aliases, since aliases are static. Instead, use the function you have created.
Look here for more information: http://www.mactips.org/archives/2008/01/01/increase-productivity-with-bash-aliases-and-functions/. (Yes I know it's mactips.org, but it's about Bash, so don't worry.)
This works in ksh:
$ alias -x mkcd="mkdir \$dirname; cd \$dirname;"
$ alias mkcd
mkcd='mkdir $dirname; cd $dirname;'
$ dirname=aaa
$ pwd
/tmp
$ mkcd
$ pwd
/tmp/aaa
The "-x" option make the alias "exported" - alias is visible in subshells.
And be aware of fact that aliases defined in a script are not visible in that script (because aliases are expanded when a script is loaded, not when a line is interpreted). This can be solved with executing another script file in same shell (using dot).
Here's a simple example function using Python. You can stick in ~/.bashrc.
You need to have a space after the first left curly bracket.
The python command needs to be in double quotes to get the variable substitution. Don't forget that semicolon at the end.
count(){ python -c "for num in xrange($1):print num";}
Example run:
$ count 6
0
1
2
3
4
5
$
range instead of xrange. But there is no need for Python here; just printf '%s\n' {0..5} or for ((i=0; i<$1; ++i)) do; echo "$i"; done if you want to use a variable for the end of the range.
sys.argv[1] ... but again, there is no particular reason to use Python (or Awk, or COBOL, or Smalltalk, or C) here.An empty alias will execute its args:
alias DEBUG=
mkdir mydirectoryname && cd $_