chdir

问题 Is it possible to change around directories using the fork command? Without going too much into my code I have the following: childpid = fork(); if (childpid >= 0) { if (childpid == 0) { ret = execvp(argv[0],argv); exit(ret); } else { waitpid(childpid,&status,0); ret = WEXITSTATUS(status); } } The above works fine when I'm entering basic command like ls , pwd , etc.. Is it possible to implement a way to use the cd function? I can type the command cd .. but it doesn't do anything. For example

问题 If I run the batch file setlocal chdir .. the directory is not changed, but if I run setlocal endlocal chdir .. it works normally. This must be exactly what is expected with setlocal. However, it is not entirely obvious when you read the definition of setlocal, which is related to how the environment variables are seen. I am hoping that this is a good occasion to explain what setlocal actually does and why it interferes with chdir. 回答1: The HELP documentation for SETLOCAL ( help setlocal or

问题 On OS X, the man page for fork says this: There are limits to what you can do in the child process. To be totally safe you should restrict yourself to only executing async-signal safe operations until such time as one of the exec functions is called. All APIs, including global data symbols, in any framework or library should be assumed to be unsafe after a fork() unless explicitly documented to be safe or async-signal safe. If you need to use these frameworks in the child process, you must

问题 I'm trying to change the current directory from C: to Y: I tried: import os os.chdir('Y:') but I keep getting an error saying that it can't locate the drive. Essentially I'm looking for the equivalent of the cd /d command in cmd. 回答1: Are you sure Y: really is a valid drive letter? Try os.chdir('C:') and make sure that works. (It works for me.) 回答2: If this is a mapped network drive, your best bet is to use the UNC path instead of the mapped path. Also, try to use a raw r string modifier when

问题 I am using chdir() to change directory to the value passed as an argument to this function. I understand that when I run my C program using gcc myCd.c and ./a.out .. this changes the directory to the parent directory "within" the C program (i.e. a child process is spawned for the a.out process, and the change of directory happens within that child process). What I want to do is, change the directory at the terminal using this C program. I tried writing a shell script for the same, and then

问题 chdir can be used for constant character paths (it takes a const char * ), but not for paths inputted by the user (since they have type char * ). Is there any way around this? 回答1: chdir can be used with arbitrary string. const modifier means that it will not modify your string. 回答2: To expand on Roman Cheplyaka's answer, type qualifiers can always be added to pointer types, but not removed. This means that a function that takes a const char * parameter is really saying it can take either a

问题 This question already has answers here : Change directory of parent process after exit [duplicate] (2 answers) Closed 4 years ago . I have a program that calls chdir() to change the cwd. However, after the program finishes the cwd changes back to the directory that called the program instead of staying the in one specified by the call to chdir(). I made a program to test if chdir() is actually changing to the specified directory and found that chdir() is doing what I presumed: changing to the

问题 A previous post might be useful: Perl system() call failed with return code 65280 Again, I've used this code many times, but it doesn't work here. I've moved all other perl instances from PATH. Source: $targetDir = "M\:\\bldforge_AOMS_DEV"; print ("targetDir=$targetDir\n"); chdir($targetDir) or die "Cant chdir to $dir $!"; $current_dir = `cd`; print "\nCurrent dir = $current_dir\n" Output: Z:\>ccperl test.pl targetDir=M:\bldforge_AOMS_DEV Current dir = 回答1: To be sure you are indeed in a

问题 I am new in c programming. How can I change directory like /home/jobs/$ans/xxx/ while I have $ans is a user string I can't chdir in c program. My script is below: #include <stdio.h> #include <stdlib.h> int main() { char jdir; printf("Enter job directory:"); /* user input for different directories */ scanf("jdir"); chdir("/home/jobs/%jdir/xxx"); system("ls -ltr"); return(0); } How to change directory with chdir ? 回答1: Use something like: char jdir[200] scanf("%s", &jdir); char blah[200];

问题 I want to start an interactive console in pydev from project directory, in order to import an app. I tried to use os.chdir at startup from Window->Preferences->PyDev->Interactive Console->Initial interpreter commands. I read https://docs.djangoproject.com/en/dev/ref/settings/ searching for an entry to set path but I didn't find anything. Thanks Edit: I had to import module first in order to import app 回答1: Strange, I must say that after changing the initial interpreter commands to be: import