在bash中创建空文件的简写在zsh中无法正常工作

如何解决在bash中创建空文件的简写在zsh中无法正常工作

在bash中，可以使用以下方式创建一个空文件：

> empty_file.txt

在zsh中，同一命令被卡住，需要停止。仍然会创建文件。

我想知道是什么导致这种行为和/或如何使其类似于bash？

编辑：错字。

解决方法

如果您没有为重定向指定命令，那么Bash的行为（根据POSIX）将类似于命令true。默认情况下，除非在兼容模式下，否则zsh的行为就像命令是cat一样。

您可以简单地显式指定命令true（或其难读的别名:）以使两个shell的行为相同：

: > empty_file.txt

man zsh在此处说明了行为以及您可以用来对其进行调整的选项：

   REDIRECTIONS WITH NO COMMAND

   When a simple command consists of one or more redirection operators
   and  zero  or  more parameter assignments,but no command name,zsh
   can behave in several ways.

   If the parameter NULLCMD is not set or the  option  CSH_NULLCMD  is
   set,an error is caused.  This is the csh behavior and CSH_NULLCMD
   is set by default when emulating csh.

   If the option SH_NULLCMD is set,the builtin `:' is inserted  as  a
   command with the given redirections.  This is the default when emu‐
   lating sh or ksh.

   Otherwise,if the parameter NULLCMD is set,its value will be  used
   as  a  command  with  the  given redirections.  If both NULLCMD and
   READNULLCMD are set,then the value of the latter will be used  in‐
   stead  of that of the former when the redirection is an input.  The
   default for NULLCMD is `cat' and for READNULLCMD is `more'. Thus

          < file

   shows the contents of file on standard output,with paging if  that
   is  a  terminal.   NULLCMD and READNULLCMD may refer to shell func‐
   tions.