如何在unix shell中撤消"set -x"？

您可以使用set +x它将其切换回来.输出help set描述了这个:

$ help set
set: set [--abefhkmnptuvxBCHP] [-o option] [arg ...]
    ...
    -v  Print shell input lines as they are read.
    -x  Print commands and their arguments as they are executed.
    ...

Using + rather than - causes these flags to be turned off.  The
flags can also be used upon invocation of the shell.  The current
set of flags may be found in $-.  The remaining n ARGs are positional
parameters and are assigned, in order, to $1, $2, .. $n.  If no
ARGs are given, all shell variables are printed.

注意"使用+而不是-使这些标志关闭"部分.