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Say I have the following alias.
alias pwd_alias='echo `pwd`' This alias is not "dynamic". It evaluates pwd as soon as the shell starts. Is there anyway to delay the evaluation of the expression in the ticks until the alias's runtime?
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Use the command command to ignore shell functions and aliases to run the actual external command. If you only want to avoid alias expansion, but still allow function definitions to be considered, then prefix the command with \ to just prevent alias expansion.
Bash users need to understand that alias cannot take arguments and parameters. But we can use functions to take arguments and parameters while using alias commands.
'set alias' for any command and the alias command will work fine on the interactive shell, whereas aliasing doesn't work inside the script. Aliases are not expanded when the shell is not interactive, unless the expand_aliases shell option is set using shopt.
bash [filename] runs the commands saved in a file. $@ refers to all of a shell script's command-line arguments. $1 , $2 , etc., refer to the first command-line argument, the second command-line argument, etc. Place variables in quotes if the values might have spaces in them.
What you really want is a function, instead of an alias.
pwd_alias() { echo "$PWD" } Aliases do nothing more than replace text. Anything with complexity calls for a function.
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As jordanm said, aliases do nothing more than replace text.
If you want the argument of echo to be the output of pwd expanded by bash, then I don't understand your question.
If you want the argument of echo to be `pwd` with the backquotes kept, it's indeed possible, for example:
alias a="echo '\`pwd\`'" So, if instead of echo you have something which does backquote expansion in its own runtime, maybe that's what you want.
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