command

问题 Whenever I use a command in a subprocess with "|" in it doesn't work it has an output of Command "|" is unknown, try "in link help". Or when I put this: #!/usr/bin/python from subprocess import call from shlex import split interface = call(split("ip -o link show | awk '{print $2}' | grep wl")) It is giving the output of: Error: either "dev" is duplicate, or "awk" is a garbage. 回答1: You can use subprocess.check_output method and Popen class though I wasn't able to chain both pipe operations.

问题 We have a Tcl built in our C/C++ application, I found the place in our code where Tcl_EvalObjv is called if the command was not found. I have to admit that the code is pretty old and not many of our developers know what happens in this module. It looks like this: // ... there is some checking if command is registered etc., it fails and the code goes here: std::vector<Tcl_Obj*> tclArgs = { NULL }; for (int i = 1; i < objc; ++i) tclArgs.push_back(objv[i]); tclArgs.shrink_to_fit(); // ...

问题 I have installed ffmpeg on my server and it works fine via my terminal. I'm able to successfully convert a file to webm format, so I'm sure the installation is fine. I'm also sure that I only have one installation of ffmpeg installed on my machine. A problem arises when I try to convert files through PHP via PHP's exec(). When I run the same commands, I ran in the terminal, nothing happens. I looked around stackoverflow and other parts of the net for some help. I tried this to see the output:

问题 I can run some Shell Linux commands in Perl (for example create a folder). But I can't execute followed command: echo 'mypassword' | gpg --passphrase-fd 0 --output outfile --decrypt inputfile I add this command in .sh file and could execute in Shell fine. but when I call .sh file, Perl couldn't run it. I used open3 , system , open commands to run. I could run other .sh file, but not for this command. Can you help me please? 回答1: Try using backquote/backtick, seems to work fine: #!/usr/bin

问题 Helllo! I'm an MS Access-beginner. After an upgrade from Access2003 to Access2010 I am changing the database connection of our MS Access-Application from ODBCDirect (not supported anymore) to ADODB. After (hopefully) successfully establishing a DB connection over an ADODB.Connection object I am initializing an ADODB.Command object: Dim qdfWork As ADODB.Command ... Set qdfWork = New ADODB.Command Set qdfWork.ActiveConnection = CurrentProject.Connection qdfWork.CommandText = "[dbo].

问题 Xcode is scrolling my window when I press Command sometime, which makes my copy/paste tricky. How can I disable this? 回答1: This happens when: you use your 3 fingers to drag and do a selection then release your fingers in the small grey border ("sensible area" in capture) It's just a bug. Just click to drag. 来源： https://stackoverflow.com/questions/28048284/xcode-auto-scroll-when-pressing-command-after-a-text-selection

问题 I made script (steamBlob.command), which deletes the file /Users/myuser/Library/Application\ Support/Steam/ClientRegistry.blob ... and another one. The code is chmod +x steamBlob.command rm -Rf /Users/pipsqueaker/Library/Application\ Support/Steam/ClientRegistry.blob rm -Rf /Users/pipsqueaker/Library/Application\ Support/Steam/AppUpdateStats.blob rm -Rf Users/pipsqueaker/Desktop/theRace.odt However, when I double click this to run it a windows pops up showing the message The file “steamBlob

问题 I have just started exploring TWILL. Twill is an amazing scripting language for Web browsing and it does all I want!!! So far I've been using twill from a Python shell ( IDLE (Python GUI) to be precise) and I do things there in the way of executing commands one by one (I mean, I type one command, run it, then type the next command): (source: narod.ru) (source: narod.ru) (source: narod.ru) (source: narod.ru) (source: narod.ru) (source: narod.ru) (source: narod.ru) But I don't know how to put

问题 A simple example is trying to cd to a directory that has more than two words. When I run the below code, I don't get the expected error: /usr/bin/cd: line 2: cd: /Directory With Two Words: No such file or directory , but this error: /usr/bin/cd: line 2: cd: '/Directory: No such file or directory . So it seems like it is ignoring the apostrophes and just looking for a directory called "Directory". Code: import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader

问题 I am reading line by line from a properties file to another file using below code(batch file). The problem is It is removing all the blank lines from the source file. What changes I should do in order to make blank lines available to destination file? FOR /F "USEBACKQ tokens=*" %%A IN (`FIND /V "" ^<"%FILE%.SRC"`) DO ( ECHO %%A>>"%FILE%" ) 回答1: FOR /F will always skip empty lines, so you have to avoid empty lines. This can be solved with prepending the lines by a line number with findstr or