打开终端时来自/usr/share/bash-完成/bash-完成的源命令错误

Question

当我打开终端时，会发现以下错误：

bash: /usr/share/bash-completion/bash_completion: line 171: syntax error near unexpected token `}'
bash: /usr/share/bash-completion/bash_completion: line 171: `}'

这是因为bash-completion文件的这个区域：

_upvar()
{
    if unset -v "$1"; then           # Unset & validate varname
        if (( $# == 2 )); then
            eval $1=\"\$2\"          # Return single value
        else
            eval $1=\(\"\${@:2}\"\)  # Return array
        fi
    fi
}

为什么我在那部分出了个错误？

Answer 1

我认为这可能是与这个U&L职位相同的问题:您有fi的别名。脚本在大多数情况下都很好，但是混叠shell关键字可能会导致意想不到的问题：

$ alias fi=find
$ . /usr/share/bash-completion/bash_completion
bash: /usr/share/bash-completion/bash_completion: line 171: syntax error near unexpected token `}'
bash: /usr/share/bash-completion/bash_completion: line 171: `}'

尽管该函数位于第170行左右，但它是该文件中使用fi的第一个位置。这可能是在设置别名之后第一次使用fi，具体取决于您放置别名的位置，以及bash提供的bash完成脚本的具体位置。

Answer 2

要查看您的别名是否与bash内置或系统命令冲突，请使用以下脚本：

#!/bin/bash -i

# NAME: alias-check
# PATH: /mnt/e/bin
# DESC: Verify alias doesn't conflict with bash built-in
# DATE: June 17, 2018.

# Get aliases
alias > /tmp/alias.lst
sed -i 's/=.*//; s/alias //g' /tmp/alias.lst
#cat /tmp/alias.lst
while read -r line 
do 
   command type -a ${line}
done< /tmp/alias.lst

测试坏别名

编辑~/.bashrc并插入以下“坏”别名：

alias fi=find
alias test='ls test'

现在运行脚本alias-check：

bash: /home/rick/.bashrc: line 171: syntax error: unexpected end of file
alert is aliased to `notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e 's/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//')"'
cdd is aliased to `cd /home/rick/SERVER/#/Dump'
cdh is aliased to `cd /home/rick'
cdm is aliased to `cd /media/rick/ST9_Win7/Users/Person/Music/iTunes/iTunes Media/Music'
egrep is aliased to `egrep --color=auto'
egrep is /bin/egrep
fgrep is aliased to `fgrep --color=auto'
fgrep is /bin/fgrep
fi is aliased to `find'
fi is a shell keyword
grep is aliased to `grep --color=auto'
grep is /bin/grep
l is aliased to `ls -CF'
la is aliased to `ls -A'
ll is aliased to `ls -alF'
ls is aliased to `ls --color=auto'
ls is /bin/ls
lsdrv is aliased to `lsblk -o NAME,FSTYPE,LABEL,MOUNTPOINT,SIZE,MODEL'
redalert is aliased to `notify-send --urgency=critical -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e 's/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//')"'
sudo is aliased to `sudo '
sudo is /usr/bin/sudo
test is aliased to `ls test'
test is a shell builtin
test is /usr/bin/test
zenity is aliased to `zenity 2>/dev/null'
zenity is /mnt/e/usr/local/bin/zenity
zenity is /usr/local/bin/zenity
zenity is /usr/bin/zenity

请注意以下几行：

• fi是shell关键字
• 测试是shell内置的

在别名中查找这些类型的错误。

测试后，不要忘记删除别名fi和test，并再次保存~/.bashrc。

您不能简单地在命令行中发出别名来运行测试，因为脚本#!/bin/bash -i的第一行使用~/.bashrc加载了一个新的shell。