'有'的bash补全关键字 [英] 'have' keyword for bash completion

问题描述

是有 A在bash关键字？或者做的bash脚本完成使用不来砸语言？

 有GCC和放大器;＆安培;
_gcc（）
{
 

这是常见的。参见：的grep有*放大器;＆安培。 /etc/bash_completion.d / *

我找不到在bash补全教程我见过的任何信息，我无法找到男人庆典的任何信息。这也是很难谷歌有。我在哪里可以找到这个文件？

我猜它与确保有做的gcc 存在于 PATH ？

编辑：是的。 的/ etc / bash_completion 包含：

 有（​​）
{
    未设置-v有
    对于系统管理员命令＃落成的安装，以及在
    ＃结案通过`sudo命令尝试......。
    PATH = $ PATH：/ sbin目录：/ usr / sbin目录：在/ usr / local / sbin中输入$ 1安培;＆GT;的/ dev / null的＆放大器;＆安培;
    有=YES
}
 

解决方案

有和 _have 只是两种功能在基 bash_completion 文件中定义。在这两者之间，他们周围形成一个包装内置键入命令来确定某一特定命令/程序可用。

 ＃此功能检查我们是否有系统给定的程序。
＃
_有（）
{
    对于系统管理员命令＃落成的安装，以及在
    ＃结案通过`sudo命令尝试......。
    PATH = $ PATH：/ usr / sbin目录：/ sbin目录：在/ usr / local / sbin中输入$ 1安培;＆GT;的/ dev / null的
}对于使用具有compat的落成＃向后兼容性（）。
＃@德precated不应再使用;通常不需要与动态
＃装载落成，并_have适合运行使用。
有（）
{
    未设置-v有
    _have $ 1安培;＆安培;有= YES
}
 

Is have a keyword in bash? Or do bash completion scripts use a language that is not bash?

have gcc &&
_gcc()
{

It is common. See: grep "have .* &&" /etc/bash_completion.d/*

I could not find any information on the bash completion tutorials I've seen and I could not find any information in man bash. It's also difficult to google "have". Where do I find documentation on this?

I'm guessing it has to do with making sure that there gcc exists in the PATH?

edit: yes. /etc/bash_completion contains:

have()
{
    unset -v have
    # Completions for system administrator commands are installed as well in
    # case completion is attempted via `sudo command ...'.
    PATH=$PATH:/sbin:/usr/sbin:/usr/local/sbin type $1 &>/dev/null &&
    have="yes"
}

解决方案

have and _have are just two functions defined in the base bash_completion file. Between the two, they form a wrapper around the built-in type command to determine if a particular command/program available.

# This function checks whether we have a given program on the system.
#
_have()
{
    # Completions for system administrator commands are installed as well in
    # case completion is attempted via `sudo command ...'.
    PATH=$PATH:/usr/sbin:/sbin:/usr/local/sbin type $1 &>/dev/null
}

# Backwards compatibility for compat completions that use have().
# @deprecated should no longer be used; generally not needed with dynamically
#             loaded completions, and _have is suitable for runtime use.
have()
{
    unset -v have
    _have $1 && have=yes
}

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