I can't figure out what the issue is here. I am in a directory:
pwd
/afs/naf.desy.de/user/e/eron/scratch/UserCode/devRA4b/UserCode/DesySusy/ra4b_2012
where I have an executable called myAnalysis. However, I also have another directory called
/afs/naf.desy.de/user/e/eron/scratch/UserCode/RA4bHead/UserCode/DesySusy/ra4b_2012/
I am now in the first one, and if I do:
gdb myAnalysis
I get:
`
Reading symbols from `/afs/naf.desy.de/user/e/eron/scratch/UserCode/RA4bHead/UserCode/DesySusy/ra4b_2012/myAnalysis...done.
why does it take the executable from the wrong directory and how can I solve that?
Thanks a lot!
Try:
gdb ./myAnalysis
Also make sure that your other folder isn't in your path. I thought that '.' was implicitly at the head of the search path, but apparently not for all OSes.
Related
I am trying to run one of the example from Beej's Guide to Network Programming (https://beej.us/guide/bgnet/), specifically showip.c (The link to the program is here: https://beej.us/guide/bgnet/examples/showip.c). Using gcc, I've typed in
gcc -o showip showip.c
Then ran the program
showip www.example.net
and I get an error showip: command not found on the same directory where the code and the program is compiled at. I'm not sure why this is the case. I've even cloned the code from his GitHub and used makefile to compile the program and yet I'm getting the same error. What exactly am I doing it wrong here?
This is actually problem with how you're running the program.
On Linux systems (unlike Windows systems) an executable in the current directory is not by default searched by the shell for programs to run. If the given program does not contain a path element (i.e. there are no / characters in the name) then only the directories listed in the PATH environment variable are searched.
Since the current directory is not part of your PATH, prefix the command with the directory:
./showip www.example.net
Is the working directory on your path? Likely not.
Try ./showip
Since the program showip is not in your $PATH you have to tell
your shell that it's in the current directory:
./showip
Or add the current directory to your $PATH but it's a less secure
option:
PATH=:$PATH
or
PATH=.:$PATH
and run it as you're trying now:
showip
Can anyone tell me where my file may have gone after this command?
The file I'm missing is stats.cpp
And what is the correct command to move it from directory prog3a to prog3c?
Thank you.
Since you did not post the actual command you used I cannot tell you what happened to the file. What I can say is that unless you used the rm command, the file is not gone. Probably got its name changed if you cannot find it or it got moved somewhere else other than the intended destination.
The correct command you should use is
mv prog3a/stats.cpp prog3c/stats.cpp
This command should be run in the directory where both prog3a and prog3c folders exist (cd to it before running the command. This is assuming they're both inside the same directory).
A more specific answer can be provided if you tell us which command you initially ran specifically and the full paths of each folder.
I am trying to execute a Makefile script and my Mac complains about 7zcat, although I already have 7z installed.
/bin/sh: 7zcat: command not found
Any thoughts on what's missing on my system? Thank you!
I have never used 7zcat before.
However, it looks like it needs to be installed on your system.
https://github.com/essentialkaos/7zcat
Also, after you download install 7zcat you have to give it execute permission with chmod. Finally, you have to execute it by calling its full path for example if you installed it to the directory you are in you would run ./7zcat file.7z or you would add the path to the file to your environment's $PATH variable.
I hope this helps. You might have to do some more research though.
When you open a Terminal window and type 7zcat and hit enter, what happens? Same message? Well, if you cannot use it, why should make be able to use it? Where and how have you installed 7z? Is the folder with the 7z binaries in your PATH? Since if it isn't, of course the command won't be found.
When the system shall run a command, it will search for this command in the directories stored in the PATH variable. Execute echo $PATH in terminal and you will get a colon separated list of directories; only these directories are searched for binaries. So either you must move your binaries to one of these (or put a symlink to one of these) or add the directory with these binaries to the PATH.
Yet there is no official 7z command line installer for MacOS, which brings me back to the original questions "Where and how have you installed 7z?" And are you sure that whatever you installed even includes a 7zcat?
I downloaded a "directory".tar.gz, extracted and unzipped the file to obtain "directory".
The installation files for this directory, were to run the make command in cygwin, to compile and pull out the files of the directory, which were written in C.
I attempt to run a command in cygwin, pfunc, which is a command supposed to be available after compiling and performing make, but cygwin says command not found.
I'm completely new to unix and cygwin.
The problem is that pfunc, if it exists, is not on your path.
The first step is to see if pfunc actually exists and if so, find out where. find / -xdev -name pfunc will give you the location of all files named pfunc. Obviously, if pfunc doesn't exist, you have another problem on your hands.
Next, you'll want to add this path to your bashrc. You can do that with:
echo "export PATH=$PATH:<the/path/find/gave/you> >> ~/.bashrc
Finally, you need to update your path in the current shell with source ~/.bashrc
K, I figured it out, there was a problem with the implementation of the program on cygwin, and for some reason find -name ....etc couldn't find the file. However, I found the location and reset the path to find the .exe file. Now everything looks good! thanks again!
I used addpath(pwd) to get my .m files working in my projects directory. When I close the window and start a new window, the path I just added is gone. But the files still run.
Is it in my path or not? How do I see the directories I have added to my path?
Also, . is the first entry I see from path. Does that mean I don't need to add any directories because it will always search the current directory first?
Thanks.
Basically, yes.
You can add a directory to the search path using addpath(), but as you know, it only exists for the current session and is reset when you restart Octave. If you want a path to survive between sessions, add it to your octaverc, a script file that gets run whenever a new session gets started. Example path to octaverc file is:
C:\Octave\3.2.4_gcc-4.4.0\share\octave\site\m\startup
Since . is in your path by default, Octave will search your current directory for any function files that it needs. Using addpath(pwd) is somewhat useless if you're just going to stay in the same directory. However, there are some cases where it'd be useful, if for example you have a directory that contains your functions, and another one that has the data that you're working on: you could start in the functions directory, do addpath(pwd), and then cd to the data directory while still being able to use your functions.
You can create batch file, which will start Octave with your directory path. Please see example below:
octave-3.6.4.exe -p "C:\MyOctaveDiretory"
-p means addpath()
addpath(pwd); savepath();
Done.
I think there is a bug in Octave (I use version 4.0.3 on Windows). When I create a new file in current path, this can't be called by Octave ("error: 'foo' undefined near line 1 column 1"). If I restart Octave, it works. This addpath(pwd) trick helps me a lot (before I unsuccessfully tried rehash() and cd elsewhere and back again).
If you had the same problem, the reason for the symptom might be:
Start Octave.
Create newfile.m.
Call newfile - fails since Octave did not register its existence.
addpath(pwd) - causes Octave to register it.
Close Octave
Start Octave - now pwd is gone from path, but newfile.m is registered at startup.
call newfile - works
I faced a similar problem in adding path where the path was added by using addpath command directly in Octave GUI (Command Window). The path added was being shown in console window but none of the functions worked.
The problem was solved by changing the path directory from Windows directory to some other direction where OS is not installed.