bash - Mac OS X echo $(date) in .bash_profile gives stale date

Question

In terminal, if i run echo $(date), it will give me the current date.

However, when i put the command in .bash_profile as an alias

alias dt="echo $(date)"

it will give me stale date. Namely, when i run dt, it will always give me the same date.

Any workaround? Thanks!

Answer 1

您需要引用它以防止扩展：

alias dt="echo \$(date)"
alias dt="echo \"\$(date)\""  ## (internally quoted)

或者只使用单引号：

alias dt='echo $(date)'
alias dt='echo "$(date)"'  ## (internally quoted)

更好的是使用一个函数：

dt() { echo "$(date)"; }