The #! marker at the beginning of scripts is called a shebang.
The #! marker at the beginning of scripts is called a shebang.
See
Questions tagged [shebang]
486 questions
18
votes
2 answers
Generating a bash script with echo, problem with shebang line
I want to explain to some friends how to add multikey support to their linux systems at bootup but first I need them to make a bash script. I want to make a simple command for them to copy and paste and I'm testing out this command I made but it…
Isaiah
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18
votes
3 answers
How can an ES6 module be run as a script in Node?
How can an ES6 module be run as a script in Node?
When I try this shebang I get an error:
#!/usr/bin/env node --experimental-modules
/usr/bin/env: ‘node --experimental-modules’: No such file or directory
If I use this shebang it has syntax errors…
curiousdannii
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18
votes
4 answers
How do I activate a conda env in a subshell?
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…
meh
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18
votes
2 answers
Why does this snippet with a shebang #!/bin/sh and exec python inside 4 single quotes work?
I'm trying to understand one of the answers to this question:
Cannot pass an argument to python with "#!/usr/bin/env python"
#!/bin/sh
''''exec python -u -- "$0" ${1+"$@"} # '''
This works well, but I do not understand why it works with four ticks…
John Schmitt
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17
votes
2 answers
Conditional shebang line for different versions of Python
I have a problem when trying to run a python script on two different computers. On each computer I would like to run the script using python version 2.7.3 however the problem I am having is that the two computers name python 2.7.3 in different…
martega
- 2,103
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15
votes
4 answers
Are there any javascript libraries for working with hashbang/shebang (#!) urls?
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…
Twipped
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15
votes
6 answers
How do I find where Python is located on Unix?
I'm working on a new server for a new workplace, and I'm trying to reuse a CGI script I wrote in Python earlier this year. My CGI script starts off with
#!/local/usr/bin/python
But when I run this on the new server, it complains that there's no…
Adam
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15
votes
5 answers
shebang env preferred python version
I have some python-2.x scripts which I copy between different systems, Debian and Arch linux.
Debian install python as '/usr/bin/python' while Arch installs it as '/usr/bin/python2'.
A problem is that on Arch linux '/usr/bin/python' also exists…
jaap
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14
votes
4 answers
using #!/usr/bin/env python3 shebang with Windows
I'm trying to run a Python script from the command line as a command on Windows -- so no usage of "Python" or ".py". If my script is named "testing.py", I am attempting to make this name into a command and call "testing" from the command line.
Going…
MasayoMusic
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14
votes
1 answer
Shebangs in conda managed environments
I am trying to write a program in Hy and run it per the instructions on the Quickstart page in the documentation.
So I installed Hy using pip from the GitHub repo per the docs, then added executable permissions to the file with chmod +x myfile.hy.…
Hugo
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14
votes
2 answers
Effects of comment (#) lines before and/or after the comment-like #!/bin/sh line
Example one
#!/bin/sh
# purpose: print out current directory name and contents
pwd
ls
Example two
# purpose: print out current directory name and contents
#!/bin/sh
pwd
ls
What is the difference – if I make the first line a comment(#), with…
Manikanta
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13
votes
6 answers
Python source header comment
What is the line
#!/usr/bin/env python
in the first line of a python script used for?
Alex
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13
votes
5 answers
Python deployment and /usr/bin/env portability
At the beginning of all my executable Python scripts I put the shebang line:
#!/usr/bin/env python
I'm running these scripts on a system where env python yields a Python 2.2 environment. My scripts quickly fail because I have a manual check for a…
cdleary
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13
votes
2 answers
Shebang for psql
I'm trying to write PostgreSQL script(s) but having a problem with shebang line
#! /usr/bin/psql [ psql_args_here ] -f
select now();
This gives me error as if I just entered psql without any arguments in command line. How do I do it right?
Mark Gurevich
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13
votes
2 answers
Relative shebang: How to write an executable script running portable interpreter which comes with it
Let's say we have a program/package which comes along with its own interpreter and a set of scripts which should invoke it on their execution (using shebang).
And let's say we want to keep it portable, so it remains functioning even if simply copied…
Anton
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