Martin Tournoij's questions

我有一堆带空格的文件名：

[~/music]% ls
Acid Eater - Black Fuzz On Wheels.ogg         Angel'in Heavy Syrup 4.mp3
Akalé Wubé - Akalé Wubé.opus                  Astor Piazzolla & Gary Burton - The New Tango.mp3
Allen Toussaint - The Bright Mississippi.mp3  B.B. King - Live at the Regal.mp3
Angel'in Heavy Syrup 1.opus                   Bar Kokhba Sextet - Lucifer.opus
Angel'in Heavy Syrup 2.opus                   Billy Bang - Vietnam the Aftermath.mp3
Angel'in Heavy Syrup 3.mp3

完成为空格插入转义字符（这也意味着没有足够的空间在两列中显示它）：

[~/music]% mpv <Tab>
Acid\ Eater\ -\ Black\ Fuzz\ On\ Wheels.ogg
Akalé\ Wubé\ -\ Akalé\ Wubé.opus
Allen\ Toussaint\ -\ The\ Bright\ Mississippi.mp3
Angel\'in\ Heavy\ Syrup\ 1.opus
Angel\'in\ Heavy\ Syrup\ 2.opus
Angel\'in\ Heavy\ Syrup\ 3.mp3
Angel\'in\ Heavy\ Syrup\ 4.mp3
Astor\ Piazzolla\ \&\ Gary\ Burton\ -\ The\ New\ Tango.mp3
B.B.\ King\ -\ Live\ at\ the\ Regal.mp3
Bar\ Kokhba\ Sextet\ -\ Lucifer.opus
Billy\ Bang\ -\ Vietnam\ the\ Aftermath.mp3

这是有道理的，但也很难阅读；我想：

[~/music]% mpv <Tab>
Acid Eater - Black Fuzz On Wheels.ogg         Angel'in Heavy Syrup 4.mp3
Akalé Wubé - Akalé Wubé.opus                  Astor Piazzolla & Gary Burton - The New Tango.mp3
Allen Toussaint - The Bright Mississippi.mp3  B.B. King - Live at the Regal.mp3
Angel'in Heavy Syrup 1.opus                   Bar Kokhba Sextet - Lucifer.opus
Angel'in Heavy Syrup 2.opus                   Billy Bang - Vietnam the Aftermath.mp3
Angel'in Heavy Syrup 3.mp3

[~/music]% mpv Acid<Tab>
# Completes to:
[~/music]% mpv Acid\ Eater\ -\ Black\ Fuzz\ On\ Wheels.ogg

# It's okay to type escapes on the cmdline; it's just the display.
[~/music]% mpv Angel\'in\ H<Tab>
Angel'in Heavy Syrup 1.opus  Angel'in Heavy Syrup 3.mp3
Angel'in Heavy Syrup 2.opus  Angel'in Heavy Syrup 4.mp3

我花了一些时间阅读 zshcompsys(1)，但我真的看不出有办法做到这一点。

我可以使用 zsh 读取文件$(< file)；例如：

% print 'Hello, world!' > test
% x=$(< test); print $x
Hello, world!

但是，错误会打印到 stderr；例如：

% x=$(< doesnt-exist); print $x
zsh: no such file or directory: doesnt-exist

# The actual error in my script, for posterity.
% x=$(< /sys/class/hwmon/hwmon4/temp2_input); print $x
zsh: error when reading /sys/class/hwmon/hwmon4/temp2_input: no such device or address

有什么方法可以捕获或消除此错误？您可以测试可读性或使用cat 2>&1并检查退出代码（这是我现在使用的），但我想知道是否$(< file)也可以使用。