java调用shell(ps -ef | grep )问题

Question

shell:ps -ef | grep 'DevCfg_Cli.pl 51964 ZYYC00002'[b]在控制台输入，输出正常[/b]root 3226 3088 0 12:51:04 pts/4 0:00 grep DevCfg_Cli.pl 51964 ZYYC0000[b]用java Runtime 调的时候，报[/b]用法：ps [ -aAdeflcjLPyZ ] [ -o 格式 ] [ -t 项列表 ][ -u 用户列表 ] [ -U 用户列表 ] [ -G 组列表 ][ -p 进程列表 ] [ -g 程序组列表 ] [ -s 标识符列表 ] [ -z 区域列表 ]'格式' 是一个或者更多的:user ruser group rgroup uid ruid gid rgid pid ppid pgid sid taskid ctidpri opri pcpu pmem vsz rss osz nice class time etime stime zone 区域 IDf s c lwp nlwp psr tty addr wchan fname comm args projid project pset[code="java"]public static String exec(String cmd,String encoding) {StringBuffer sb1;StringBuffer sb2;sb1 = new StringBuffer();sb2 = new StringBuffer();String temp1 = "";String temp2 = "";Runtime rt = Runtime.getRuntime();try {System.out.println("[===============执行命令==========]:"+cmd);Process p = rt.exec(cmd);BufferedReader bufferedReader1 = new BufferedReader(new InputStreamReader(p.getInputStream(),encoding));BufferedReader bufferedReader2 = new BufferedReader(new InputStreamReader(p.getErrorStream(),encoding));        while ((temp1 = bufferedReader1.readLine()) != null) {             sb1.append(temp1);             System.out.println(temp1);         }         while ((temp2 = bufferedReader2.readLine()) != null) {             sb2.append(temp2);             System.err.println(temp2);         }         p.waitFor();         return sb1.toString();     } catch (Exception e) {         e.printStackTrace();     }     return sb1.toString(); }