command-line

问题 Does anyone know any unix commands/perl script that would insert a specific character (that can be entered as either hex (ie 7C) or as the actual character (ie |)) in the position of the nth recurring occurence of a specific character. ie perl script.pl "," 3 "|" data.txt would replace every 3rd,6th,9th...etc comma with a pipe. So if data.txt had the following before the script was run: fd,3232,gfd67gf, peas,989767,jkdfnfgjhf, dhdhjsk,267,ujfdsy,fuyds,637296,ldosi,fduy, 873,fuisouyd,try save

问题 Does anyone know any unix commands/perl script that would insert a specific character (that can be entered as either hex (ie 7C) or as the actual character (ie |)) in the position of the nth recurring occurence of a specific character. ie perl script.pl "," 3 "|" data.txt would replace every 3rd,6th,9th...etc comma with a pipe. So if data.txt had the following before the script was run: fd,3232,gfd67gf, peas,989767,jkdfnfgjhf, dhdhjsk,267,ujfdsy,fuyds,637296,ldosi,fduy, 873,fuisouyd,try save

问题 I have below bash script, I am a bit confuse about what is $opt meaning. and I do not find detail information about it after search. test.sh: echo "opt:" $opt for opt; do echo $opt done output: ./test.sh -a -b c opt: -a -b c 回答1: From the bash(1) man page: for name [ [ in [ word ... ] ] ; ] do list ; done The list of words following in is expanded, generating a list of items. The variable name is set to each element of this list in turn, and list is executed each time. If the in word is omit‐

问题 I have a java desktop application that contains the following code: JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); System.out.println("check1"); int intResult = compiler.run(System.in, System.out, foutErrorFile, strvalidatePath); System.out.println("check2"); When I run the corresponding .jar file of this application by executing "java -jar name.jar", both check1 and check2 gets printed and app works fine. But when i try to run the jar by double clicking the .jar file, I found

问题 Is it possible to get version installed chrome version using command prompt in windows? Tried, "C:\Program Files\Google\Chrome\Application\chrome.exe" -version "C:\Program Files\Google\Chrome\Application\chrome.exe" --version "C:\Program Files\Google\Chrome\Application\chrome.exe" -product-version "C:\Program Files\Google\Chrome\Application\chrome.exe" --product-version When i do that, a browser instance is opening. What flag should I be using to get the version. I am using Windows 7. Google

问题 Here is the situation: I have been called upon to work with InstallAnywhere 8, a Java-based installer IDE, of sorts, that allows starting and stopping of windows services, but has no built-in method to query their states. Fortunately, it allows you to create custom actions in Java which can be called at any time during the installation process (by way of what I consider to be a rather convoluted API). I just need something that will tell me if a specific service is started or stopped. The IDE

问题 [purpose] This simple command sequence runs expected in the Windows' CMD shell: dir & echo hello will list the files and directories and echo the string. However, the following command sequence does not run as expected (at least by me): C:\Users\Administrator>set name=value & echo %name% %name% C:\Users\Administrator>echo %name% value C:\Users\Administrator> As we can see, the first echo cannot get the environment. Could you help to comment? Any comment will be appreciated! PS: OS:Windows 7

问题 How do you use the fork() command in such a way that you can spawn 10 processes and have them do a small task concurrently. Concurrent is the operative word, many places that show how to use fork only use one call to fork() in their demos. I thought you would use some kind of for loop but i tried and it seems in my tests that the fork()'s are spawning a new process, doing work, then spawning a new process. So they appear to be running sequentially but how can I fork concurrently and have 10

问题 In Eclipse, you can provide the program argument ${string_prompt} in your run configuration to have it prompt for the command line arguments. Is there a way to do this in IntelliJ? 回答1: Edit: This may be a bug in IDEA, the solution that I first posted (you can see it below) causes Intellij to hang after entering parameter. I couldn't come up with a solution to this, but here's a little trick: you can scroll to the very bottom of Run/Debug configuration screen and in "Before launch" section

问题 How do I compile and upload Arduino sketches from the command line on Mac and Linux? I've installed the Arduino programming environment. Are there some sample makefiles anywhere? 回答1: Compiling and uploading sketches (as apposed to C/C++ sources) on the command line (on Windows, Mac, and Linux) is supported directly via flags to the arduino executable since 1.5.0. An ino can be compiled and uploaded with arduino --upload [sketch.ino] Documentation 回答2: There is a command-line Arduino toolkit