bash中有关键字吗？还是做bash完成脚本使用不是bash的语言？
have gcc &&
_gcc()
{
是很常见.参见：grep“have.*&&” /etc/bash_completion.d/*
我找不到有关我看到的bash完成教程的任何信息,而且我在man bash中找不到任何信息. google也很难“有”.我在哪里可以找到文档？
我猜测它与确保GATH中存在PATH有关吗？
编辑：是的. / etc / bash_completion包含：
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 $1 &>/dev/null &&
have="yes"
}
have和_have只是在基础bash_completion文件中定义的两个函数.在两者之间,它们围绕内置类型命令形成一个包装器,以确定特定的命令/程序是否可用.
# This function checks whether we have a given program on the system.
#
_have()
{
# Completions for system administrator commands are installed as well in
# case completion is attempted via `sudo command ...'.
PATH=$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
}
