在C/C++中,__FUNCTION__常量记录当前函数的名称。有时候,在日志输出的时候包含这些信息是非常有用的。而在Bash中,同样有这样一个常量FUNCNAME,但是有一点区别是,它是一个数组而非字符串,其中数组的第一个元素为当前函数的名称。

可能初看有点难以理解,为什么FUNCNAME要是一个数组呢?看看下面的例子,你就明白了。

#!/bin/bash

function test_func()
{
    echo "Current $FUNCNAME, \$FUNCNAME => (${FUNCNAME[@]})"
    another_func
    echo "Current $FUNCNAME, \$FUNCNAME => (${FUNCNAME[@]})"
}

function another_func()
{
    echo "Current $FUNCNAME, \$FUNCNAME => (${FUNCNAME[@]})"
}

echo "Out of function, \$FUNCNAME => (${FUNCNAME[@]})"
test_func
echo "Out of function, \$FUNCNAME => (${FUNCNAME[@]})"

执行后的结果为:

Out of function, $FUNCNAME => ()
Current test_func, $FUNCNAME => (test_func main)
Current another_func, $FUNCNAME => (another_func test_func main)
Current test_func, $FUNCNAME => (test_func main)
Out of function, $FUNCNAME => ()

所以,更加准确地说,FUNCNAME是一个数组,但是bash中会将它维护成类似一个堆栈的形式。

与FUNCNAME相似的另外一个比较有用的常量是BASH_SOURCE,同样是一个数组,不过它的第一个元素是当前脚本的名称。
这在source的时候非常有用,因为在被source的脚本中,$0是父脚本的名称,而不是被source的脚本名称。而BASH_SOURCE
就可以派上用场了。

# If the script is sourced by another script
if [ -n "$BASH_SOURCE" -a "$BASH_SOURCE" != "$0" ]
then
    do_something
else # Otherwise, run directly in the shell
    do_other
fi

唯一遗憾的是,这种做法会让脚本失去一些可移植性,因为不是所有的shell都支持这些常量。

转载请注明转自: 团子的小窝 , 本文固定链接: Bash 获取当前函数名

  1. car insurance's avatar
    car insurance 发表于 2016-06-04 19:52:30 回复 #1

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