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中国DOS联盟论坛 » DOS启动盘 & LOGO技术 （启动盘室） » Question about BAT files View 708　Replies 4
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Original Poster Posted 2004-08-04 00:00　·　 中国 天津 教育网
beidouking
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:loop
if errorlevel %1 goto no_shift
:do_shift
set cdrom=%2
shift
shift
if not %1*==* goto loop
goto no_ramdrive
Can someone give a detailed explanation? This is from SETRAMD.BAT on the 98 boot disk.
Thanks in advance
Floor 2 Posted 2004-08-04 00:00　·　 中国 广东 广州 白云区 电信
JonePeng
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These few lines are for finding the drive letter of the virtual hard disk; only by looking together with autoexec.bat can you know their whole background. Indeed, these few lines are written so～～～terse!!! Just a few batch statements, and by using shift and a loop they actually outperform an assembly program! Impressive! I need to study this seriously too。。。。。。
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Floor 3 Posted 2004-08-04 00:00　·　 中国 辽宁 抚顺 联通
wchong
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Wow! So BAT can be this powerful too!
Floor 4 Posted 2004-08-07 00:00　·　 中国 广西 贺州 电信
je64
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What is shift used for here?
Floor 5 Posted 2004-08-08 00:00　·　 中国 广东 广州 白云区 电信
JonePeng
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Shift moves all command-line parameters one place to the left. For example, if there are five parameters, %1 %2 %3 %4 %5, after one shift they become %2 %3 %4 %5, and after another shift they become %3 %4 %5, and so on.
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