under Ubuntu 18 Linux I try to set an alias in .bash_aliases with 2 commands in it, and reading an input parameter
alias nd="mkdir $1 && cd $1"
I do "nd qq", and the result is
mkdir: missing operand
Where is my error ? Any help is welcome
PD.- I have an alias with "parameter" that works fine :
alias mira="ps -ef | grep -v grep | grep $1"
I do "mira dhcp" and result is OK
PD2.- if I code
alias nd="mkdir $1"
... it works perfect
Have you tried running alias nd afterward? The output is
alias nd='mkdir && cd '
which should let you see that something has gone wrong.
When you feed the shell with
alias nd="mkdir $1 && cd $1"
the processes this line; among other things, the processing results in expanding the variable $1, which is empty in your current environment, as you can see by entering echo $1 in the terminal.
Bottom line: alias is not the tool for this. A function is the tool for this. Run the following in your shell, and then nd will do what you want.
nd() { mkdir $1 && cd $1; }
When you do
alias nd="mkdir $1"
this explands to
alias nd='mkdir '
(the trailing space really does nothing) so you have just created another name for mkdir, much like you had done
alias nd=mkdir
and this is why it "works".
