shebang

问题 I'm developing a set of script in python3, as shebang I use this: #!/usr/bin/env python3 Everything goes ok, but in some virtual machines where are executed the name of interpreter is python3.5 . I will like to be able to execute my scripts in both enviroment but I can't change the filesystem of virtual machine (so I discard solutions like make a link from python3.5 to python3 ) I look at man of env but I don't find any way to specify a searching pattern or something like that. I try to set

问题 I've written a python program. And if I have a shebang like this one: #!/usr/bin/python and I make the file executable with: $ chmod 755 program.py I can run the program like so: $ ./program.py Here is the issue. I use the conda virtual environments. When I run the program like above, the system creates a subshell that does not recognize the active environment: (my_env) $ ./program.py ImportError: No module named pymongo If I do it this way, however... (my_env) $ python program.py # blah blah

问题 What is the line #!/usr/bin/env python in the first line of a python script used for? 回答1: In UNIX and Linux this tells which binary to use as an interpreter (see also Wiki page). For example shell script is interpreted by /bin/sh . #!/bin/sh Now with python it's a bit tricky, because you can't assume where the binary is installed, nor which you want to use. Thus the /usr/bin/env trick. It's use whichever python binary is first in the $PATH . You can check that executing which python With the

问题 I'm trying to get and kill all other running python instances of the same script, I found an edge case where the path is not in psutil's cmdline list, when the process is started with ./myscript.py and not python ./myscript.py the script's content is, note the shebang: #!/bin/python import os import psutil import sys import time for proc in psutil.process_iter(): if "python" in proc.name(): print("name", proc.name()) script_path = sys.argv[0] proc_script_path = sys.argv[0] if len(proc.cmdline

问题 How can I create a build system in Sublime Text 3 where "cmd" is replaced with a shebang if it exists? More specifically, is there a way to alter the Python build system to use the version of Python specified in the shebang, and use a default if no shebang is present? 回答1: Sublime build systems have an option named target which specifies a WindowCommand that is to be invoked to perform the build. By default this is the internal exec command. You can create your own command that would examine

问题 I have the following script #!/usr/bin/Rscript print ("shebang works") in a file called shebang.r. When I run it from command line using Rscript it works $ Rscript shebang.r but when I run it from the command line alone $ shebang.r It doesn't work. shebang.r command not found. If I type (based on other examples I've seen) $ ./shebang.r I get permission denied. Yes, Rscript is located in /usr/bin directory 回答1: Make the file executable. chmod 755 shebang.r 回答2: In addition to Sjoerd's answer..

问题 With all the negative press over Twitter and Gawker's use of hashbang urls I'm having a very hard time finding any examples/libraries for how to actually use them. I'd like to use hashbang urls in a javascript carousel on our website so we can link directly to a specific page of the carousel. Are there any good cross-browser libraries or examples (preferably non-jQuery, since we use Prototype) for both pushing new urls to the page location and for parsing the url on page load? 回答1: We've been

问题 I can't seem to get bash scripts to turn into executable files via shebang. My code looks like #!/bin/bash echo "hello" where this is in a file called test.sh . I'm trying to get it to run with the command ./test.sh in the command line but i just receive the error of permission denied . When i change it to sudo ./test.sh I just get back that command not found . I can turn the file into an executable via the command the the command line: chmod +x test.sh and the code correctly outputs hello I

问题 I have an awk script that I have defined thus: #!/usr/bin/env awk BEGIN { if (!len) len = 1; end = start + len } { for (i = start; i < end; i++) { print $1 } } I have saved it as columns and chmod +x 'd it. I want invoke it so that start and end are defined as it traverses over a file. I was thinking this should work: cat some_file | columns -v start=2 But it doesn't. Help! 回答1: Try using: #!/usr/bin/awk -f as an interpreter 回答2: env is the easiest way to handle this problem: #!/usr/bin/env

问题 I've been using this, but it changes the mimetype to text/x-shellscript , which makes editors like Emacs treat my code like Shell scripts. #!/bin/sh exec scala "$0" "$@" !# 回答1: The bangshe (!#) might be the problem I commented out the !# and the following works in my environment: File: hello.sh #!/usr/bin/env scala val name = readLine("What is your name? ") println("Hello " + name + "!") Changed to executable permissions and then ran: chmod a+x hello.scala ./hello.scala 回答2: As I can test,