Unix的set-x含义是什么

Question

Unix的 set -x含义是什么

Answer 1

设置读写变量
Unix下详细说明
set(n) Tcl set(n)
_________________________________________________________________
NAME
set - Read and write variables
SYNOPSIS
set varName ?value?
_________________________________________________________________
DESCRIPTION
Returns the value of variable varName. If value is
specified, then set the value of varName to value, creating
a new variable if one doesn't already exist, and return its
value. If varName contains an open parenthesis and ends
with a close parenthesis, then it refers to an array
element: the characters before the first open parenthesis
are the name of the array, and the characters between the
parentheses are the index within the array. Otherwise
varName refers to a scalar variable.
If varName includes namespace qualifiers (in the array name
if it refers to an array element), or if varName is
unqualified (does not include the names of any containing
namespaces) but no procedure is active, varName refers to a
namespace variable resolved according to the rules described
under NAME RESOLUTION in the namespace manual page.
If a procedure is active and varName is unqualified, then
varName refers to a parameter or local variable of the
procedure, unless varName was declared to resolve
differently through one of the global, variable or upvar
commands.