Difference between revisions of "Alias"
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| − | An alias is a string that stands for a command. For example you can define "greet" to be an alias for "echo 'hello world'" like this: | + | An alias is a string that stands for a command. |
| + | |||
| + | = Bash shell = | ||
| + | For example you can define "greet" to be an alias for "echo 'hello world'" in the [[bash]] [[shell]] like this: | ||
# alias greet="echo 'hello world'" | # alias greet="echo 'hello world'" | ||
# greet | # greet | ||
hello world | hello world | ||
| + | = csh shell = | ||
| + | For example you can define "greet" to be an alias for "echo 'hello world'" in the csh [[shell]] like this: | ||
| + | # alias greet "echo 'hello world'" | ||
| + | # greet | ||
| + | hello world | ||
| + | |||
| + | = Showing the definition = | ||
So you can set an alias using the [[command]] alias. With this command you can also show the meaning of a alias: | So you can set an alias using the [[command]] alias. With this command you can also show the meaning of a alias: | ||
# alias dir | # alias dir | ||
alias dir='ls -l' | alias dir='ls -l' | ||
| + | |||
| + | Aliases are similar to shell functions, but you cannot display a function's definition while you can display an aliases' definition. | ||
= Setting an alias = | = Setting an alias = | ||
| − | To set an alias persistently for all users, all shells ( | + | To set an alias persistently for all users, all shells (csh, [[bash]], ...) and all type of shells ([[login shells]] and non-login shells) you need to |
* modify /etc/profile | * modify /etc/profile | ||
:for [[logIn shells]] | :for [[logIn shells]] | ||
| − | * modify /etc/ | + | * modify /etc/bash.bashrc |
:for non-login [[bash]] [[shells]] | :for non-login [[bash]] [[shells]] | ||
Latest revision as of 09:32, 19 September 2013
An alias is a string that stands for a command.
Bash shell
For example you can define "greet" to be an alias for "echo 'hello world'" in the bash shell like this:
# alias greet="echo 'hello world'" # greet hello world
csh shell
For example you can define "greet" to be an alias for "echo 'hello world'" in the csh shell like this:
# alias greet "echo 'hello world'" # greet hello world
Showing the definition
So you can set an alias using the command alias. With this command you can also show the meaning of a alias:
# alias dir alias dir='ls -l'
Aliases are similar to shell functions, but you cannot display a function's definition while you can display an aliases' definition.
Setting an alias
To set an alias persistently for all users, all shells (csh, bash, ...) and all type of shells (login shells and non-login shells) you need to
- modify /etc/profile
- for logIn shells
- modify /etc/bash.bashrc
