#!/bin/bash# script "set-test"# 使用3個(gè)命令行參數(shù)來(lái)調(diào)用這個(gè)腳本,# 比如, "./set-test one two three".echoecho "Positional parameters before  set \`uname -a\` :"echo "Command-line argument #1 = $1"echo "Command-line argument #2 = $2"echo "Command-line argument #3 = $3"set `uname -a` # 把`uname -a`的命令輸出設(shè)置               # 為新的位置參數(shù).echo $_        # unknown(譯者注: 這要看你的uname -a輸出了,這句打印出的就是輸出的最后一個(gè)單詞.)# 在腳本中設(shè)置標(biāo)志.echo "Positional parameters after  set \`uname -a\` :"# $1, $2, $3, 等等. 這些位置參數(shù)將被重新初始化為`uname -a`的結(jié)果echo "Field #1 of 'uname -a' = $1"echo "Field #2 of 'uname -a' = $2"echo "Field #3 of 'uname -a' = $3"echo ---echo $_        # ---echoexit 0