"alias:=:not found"和未定义别名，别名为"alias ll ='ls -l'".在.bashrc中 [英] "alias: =: not found", and alias not defined, with "alias ll = 'ls -l'" in .bashrc

问题描述

我在Mac OSX上，尝试在.bashrc中放入一些基本别名(例如 alias ll ='ls -l').我从.bash_profile中获取.bashrc，在启动时它可以识别我在.bashrc中具有的功能.但是，每次添加别名然后尝试启动它时，都会收到以下错误消息:

I'm on Mac OSX and trying to put some basic aliases in .bashrc (e.g. alias ll = 'ls -l'). I sourced .bashrc in .bash_profile, and on startup it recognizes a function that I have in .bashrc. However, I get the following error messages every time I add an alias and then try to start it up:

-bash: alias: ll: not found
-bash: alias: =: not found
-bash: alias: ls -l: not found

ll别名不起作用，但是以下函数声明的命令起作用:

The ll alias does not work, but the command declared by the following function does:

#!/bin/bash
# prints the input
function print_my_input() {
  echo 'Your input: ' $1
}

我还需要执行其他步骤来创建普通别名吗?

Is there an additional step I need to do to create normal aliases?

推荐答案

尝试以下方法:

alias ls='ls --color=auto'
alias ll='ls -l'
alias la='ls -la'

alias cd..='cd ..'
alias ..='cd ..'

在分配变量和别名时，

Bash不允许在 = 符号前后添加空格.

Bash does not allow a space before and after an = sign when assigning variables as well as aliases.

在旁注中，有两种方法来声明函数:

On a sidenote, there are two ways to declare a function:

使用关键字 function 表示函数声明

Using the keyword function to indicate a function declaration

function myfunction { # function is a keyword
    echo hello
}

或通过简单地在函数名称后加上花括号并省略 function 关键字

or by simply putting braces after the function name and omitting the function keyword

myfunction() { # () indicate a function definition
    echo hello
}

同时使用这不是一个错误，而是多余的.此外， Charles Duffy 在评论中指出:

Using both is not an error but redundant. Furthermore, Charles Duffy points out in the comments:

...不仅冗余，而且不必要地不可移植.myfunction(){保证可以在所有POSIX shell上使用；函数myfunction {作品在旧的ksh上(并且在bash中受支持以与之兼容)；将两者结合起来在基线POSIX或旧的ksh上无效.

...not just redundant, but also needlessly nonportable. myfunction() { is guaranteed to work on all POSIX shells; function myfunction { works on old ksh (and is supported in bash for compatibility with same); combining the two doesn't work on baseline-POSIX or on old ksh.

这篇关于"alias:=:not found"和未定义别名，别名为"alias ll ='ls -l'".在.bashrc中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！