我们假设变量的值为'hello world'
。
我想这样做,所以变量中的其他内容并不重要:例如,如果它有某个单词,hello
,它会执行某个命令。
如果它没有单词hello
,它会执行不同的命令。
答案 0 :(得分:1)
echo %path% | findstr /i /c:"hello" && Echo Success || Echo Failure
从MSDos 6.22帮助文件。
查找退出代码
以下列表显示了每个退出代码及其简要说明 意思是:
0搜索已成功完成且至少找到一个匹配项。
1搜索已成功完成,但未找到匹配项。
2搜索未成功完成。在这种情况下,出错 在搜索期间发生,并且FIND无法报告是否有任何匹配 被发现了。
您可以批量使用命令行中的ERRORLEVEL参数 程序来处理FIND返回的退出代码。
关于CMD的特殊角色。
& seperates commands on a line.
&& executes this command only if previous command's errorlevel is 0.
|| (not used above) executes this command only if previous command's errorlevel is NOT 0
> output to a file
>> append output to a file
< input from a file
| output of one command into the input of another command
^ escapes any of the above, including itself, if needed to be passed to a program
" parameters with spaces must be enclosed in quotes
+ used with copy to concatinate files. E.G. copy file1+file2 newfile
, used with copy to indicate missing parameters. This updates the files modified date. E.G. copy /b file1,,
%variablename% a inbuilt or user set environmental variable
!variablename! a user set environmental variable expanded at execution time, turned with SelLocal EnableDelayedExpansion command
%<number> (%1) the nth command line parameter passed to a batch file. %0 is the batchfile's name.
%* (%*) the entire command line.
%<a letter> or %%<a letter> (%A or %%A) the variable in a for loop. Single % sign at command prompt and double % sign in a batch file.