Java exec execCmd(String cmd)

Description

execute a command in the shell of the OS

License

Open Source License

Parameter

Parameter	Description
cmd	command to execute

Exception

Parameter	Description
IOException	passes up any IO exception

Return

output from STDOUT

Declaration

public static String execCmd(String cmd) throws IOException 

Method Source Code

//package com.java2s;
/*//from  w  w w  .  j a v  a2 s .c  o m
 * ExecUtils.java 
 *
 * Created on by OneBigCD, circa 2000.
 * Copyright (C) 2000 Patrick Farrell   All Rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.*;

public class Main {
    /** execute a command in the shell of the OS
     * @param cmd command to execute
     * @throws IOException passes up any IO exception
     * @return output from STDOUT
     */
    public static String execCmd(String cmd) throws IOException {
        Process p = Runtime.getRuntime().exec(cmd);
        InputStream is = p.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(is));

        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        String line = " a";
        while ((line = br.readLine()) != null) {
            pw.println(line);
        }
        int rslt = 0;
        try {
            rslt = p.waitFor();
        } catch (InterruptedException e) {
            throw new IOException("Process did not complete before closing stdOut");
        }
        br.close();
        is.close();
        pw.flush();
        pw.close();
        if (rslt < 0 || rslt > 1)
            throw new IOException("RIP Problem - result=" + rslt + "  " + sw.toString());
        return sw.toString();
    }
}

Related

1. exec(String... command)
2. exec(String[] args)
3. execAdbCmd(String cmd)
4. execAndGetOutput(ProcessBuilder builder)
5. execCmd(String cmd)
6. execCmd(String cmd, File where)
7. execCmd(String command)
8. execCmdWindows(String cmd)
9. execCommand(String cmd)