Fedora17-command not found-命令延时

Fedora 17下不小心输入错误一条命令，提示command not found之后，往往还有几秒的延迟，这段时间系统干嘛去了呢？

在Fedora 17里，如果发现刚刚输入的这个命令没有，会自动在网上查找，所以导致command not found提示之后，还有几秒的latency。

这个机制是由“PackageKit-command-not-found-0.7.4-3.fc17.x86_64” 包提供的，找到它的配置文件就可以把这几秒远程查找的latency关闭掉：

vim /etc/PackageKit/CommandNotFound.conf

找到SoftwareSourceSearch=true

# Controls if the tool should search for packages in remote
# software sources. This may introduce a non-trivial delay if the sources
# have not been recently refreshed.
#
# Allowed values are 'true' or 'false'
#
# default=true
SoftwareSourceSearch=true

设置为false，就可以关闭掉search功能。

另外，“SimilarNameSearch”这一条也可以考虑关掉：

# Controls if the tool should look for similar command names and suggest
# those instead.
#
# Allowed values are 'true' or 'false'
#
# default=true
SimilarNameSearch=true

它的功能如下，比如我输入‘sl’，它会提示你相似的命令是‘ls’：

[root@fedora conf]# sl
bash: sl: command not found...
Similar command is: 'ls'

---EOF---

--nigelzeng