我尝试通过取消注释以下几行来启用 shell 自动完成功能.bashrc
:
# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
if [ -f /usr/share/bash-completion/bash_completion ]; then
. /usr/share/bash-completion/bash_completion
elif [ -f /etc/bash_completion ]; then
. /etc/bash_completion
fi
fi
然而,这有副作用。尽管自动完成功能似乎有效,但当我打开一个新终端时,只会出现一个闪烁的光标:
user@machine:~$
按下 后我才返回到通常的提示Ctrl+C
。
如果我注释掉以上几行,就会恢复正常行为(但不再有自动完成功能)。
我不明白问题是什么。
--更新 1--
代码的作用如下:
--更新 2--
这是建议命令的输出。有些东西不断循环,终端被输出淹没。
++++++ : /etc/bash_completion.d
++++++ readonly BASH_COMPLETION_COMPAT_DIR
++++++ _blacklist_glob='@(acroread.sh)'
++++++ shopt -s extglob progcomp
++++++ complete -d pushd
++++++ complete -u write chfn groups slay w sux runuser
++++++ complete -A stopped -P '"%' -S '"' bg
++++++ complete -j -P '"%' -S '"' fg jobs disown
++++++ complete -v readonly unset
++++++ complete -A setopt set
++++++ complete -A shopt shopt
++++++ complete -A helptopic help
++++++ complete -a unalias
++++++ complete -A binding bind
++++++ complete -c command type which
++++++ complete -b builtin
++++++ [[ linux-gnu == *@(solaris|aix)* ]]
++++++ [[ linux-gnu == *@(solaris|aix)* ]]
++++++ [[ linux-gnu == *@(solaris|aix)* ]]
++++++ _backup_glob='@(#*#|*@(~|.@(bak|orig|rej|swp|dpkg*|rpm@(orig|new|save))))'
++++++ complete -F _service service
++++++ _sysvdirs
++++++ sysvdirs=()
++++++ [[ -d /etc/rc.d/init.d ]]
++++++ [[ -d /etc/init.d ]]
++++++ sysvdirs+=(/etc/init.d)
++++++ [[ -f /etc/slackware-version ]]
++++++ for svcdir in '${sysvdirs[@]}'
++++++ for svc in '$svcdir/!($_backup_glob)'
++++++ [[ -x /etc/init.d/acpid ]]
++++++ complete -F _service /etc/init.d/acpid
++++++ for svc in '$svcdir/!($_backup_glob)'
++++++ [[ -x /etc/init.d/anacron ]]
++++++ complete -F _service /etc/init.d/anacron
++++++ for svc in '$svcdir/!($_backup_glob)'
++++++ [[ -x /etc/init.d/apparmor ]]
--更新 3--
这是所要求的输出:
ac@ac:~$ grep -r bash_completion /etc/bash_completion.d
/etc/bash_completion.d/bash.bashrc:# if [ -f /usr/share/bash-completion/bash_completion ]; then
/etc/bash_completion.d/bash.bashrc:# . /usr/share/bash-completion/bash_completion
/etc/bash_completion.d/bash.bashrc:# elif [ -f /etc/bash_completion ]; then
/etc/bash_completion.d/bash.bashrc:# . /etc/bash_completion
/etc/bash_completion.d/bash.bashrc.bak:# if [ -f /usr/share/bash-completion/bash_completion ]; then
/etc/bash_completion.d/bash.bashrc.bak:# . /usr/share/bash-completion/bash_completion
/etc/bash_completion.d/bash.bashrc.bak:# elif [ -f /etc/bash_completion ]; then
/etc/bash_completion.d/bash.bashrc.bak:# . /etc/bash_completion
/etc/bash_completion.d/inkscape:# put this file in /etc/bash_completion.d/
/etc/bash_completion.d/desktop-file-validate:# put this file in /etc/bash_completion.d/
/etc/bash_completion.d/bash_completion~:. /usr/share/bash-completion/bash_completion
/etc/bash_completion.d/git-completion.bash:# bash_completion - programmable completion functions for bash 3.2+
/etc/bash_completion.d/libreoffice.sh:# Programmable bash_completion file for the main office applications
/etc/bash_completion.d/bash_completion:# . /usr/share/bash-completion/bash_completion
确实,最后一行显示了您所预测的内容。但我不知道如何处理该文件:我应该删除它,还是我错误地覆盖了它?如果是这样,原始内容是什么?
答案1
您得到的输出set -x
包含很多加号 ( ++++++
),这意味着/usr/share/bash-completion/bash_completion正在以递归方式重新获取资源。
换句话说,/usr/share/bash-completion/bash_completion正在“呼叫”自己,导致一种无限循环,正如您注意到的。
如果我是你,我会检查/etc/bash_completion.d寻找参考/usr/share/bash-completion/bash_completion。具体来说,我会这样做:
ls -l /etc/bash_completion.d
(不得有符号链接到/usr/share/bash-completion/bash_completion(英文):grep -r bash_completion /etc/bash_completion.d
(没有文件在/etc/bash_completion.d应该来源/usr/share/bash-completion/bash_completion)。
或者,你可以在 shell 中运行这两个命令(当然,没有启用 bash 完成功能):
set -x
. /usr/share/bash-completion/bash_completion |& grep -E "^\++ (\.|source)"
这将打印所有“导入”,并帮助我们识别导致问题的令人讨厌的代码片段。
从输出中grep -r bash_completion /etc/bash_completion.d
你可以看到很多匹配项。它们大多数都是注释(因为它们以 开头#
),但有一行很有趣:
/etc/bash_completion.d/bash_completion~:. /usr/share/bash-completion/bash_completion
/etc/bash_completion.d/bash_completion~是罪魁祸首。这是导致递归资源的文件。
/usr/share/bash-completion/bash_completion事实上会自动获取/etc/bash_completion.d目录。但对于你的情况,这个目录包含bash_completion〜文件,即采购/usr/share/bash-completion/bash_completion再次。这会导致您遇到的那种循环。
因此请继续删除它!
sudo rm /etc/bash_completion.d/bash_completion~
(或者如果您认为它包含一些有用的东西,也许可以阅读它。)
我无法告诉你为什么该文件位于该目录中。我能告诉你的是,后缀~
表示这是一个备份文件。许多文本编辑器(包括 Gedit)在保存时都会创建备份副本。可能是你在进行更改时不小心把它留在那里了。
答案2
为了调试,您可以添加几echo
行代码来查看代码执行情况。我假设它在某个地方中断了,但声音不会很大。
用类似下面的内容替换它:
if ! shopt -oq posix; then
echo Entering bash-completion load
if [ -f /usr/share/bash-completion/bash_completion ]; then
echo Sourcing /usr/share/bash-completion/bash_completion
. /usr/share/bash-completion/bash_completion
echo Sourced
elif [ -f /etc/bash_completion ]; then
echo Sourcing /etc/bash_completion
. /etc/bash_completion
echo Sourced
fi
fi
echo Done
在理想世界中你会看到:
Entering bash-completion load
Sourcing /usr/share/bash-completion/bash_completion
Sourced
Done
如果它陷入了 bash_completion 脚本,请打开调试并手动获取它(假设您的终端仍然有效):
set -x
. /usr/share/bash-completion/bash_completion
这应该输出直到它中断(或退出)为止的内容,并且应该为您提供有关实际问题的另一个指标。