Questions tagged [interpreter]
The interpreter tag has no usage guidance.
19
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VS Code Won't Recognize R Installation
I installed R via the commands at this website. Running R in terminal works properly; running which R returns /usr/bin/R. VS code cannot find R despite the path for rterm and rpath being given ...
0
votes
1
answer
150
views
Does the shell script interpreter optimize if else chains?
As far as I understand, an interpreter runs code line by line; but I find probable that my reasoning is incorrect. If in this example case the first if line returns true, will the program know to skip ...
- 3
-1
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1
answer
30
views
Is it correct to divide parsing into simple and complex? [closed]
I understand "field splitting" (or alternatively "word splitting") as a possible part of a broader process named parsing, while field splitting is done on parsing in various shells ...
0
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2
answers
135
views
Why two or more read commands cannot be executed in one go (without some separation syntax)?
I tried to copy-paste the following two commands into the terminal directly and to then execute them:
read -s x
read -s y
Current output is empty prompt but desired output is the first read execution ...
- 9
1
vote
3
answers
2k
views
Switch the default shell by another interpreter
So I have some experience with linux and I was always wondering if it is possible to modify the terminal so that it executes a different interpreter (like python) rather than the default shell ...
- 13
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3
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212
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bash line interpreting process
I would like to understand the exact process of line interpretation executed by bash.
from GNU bash reference manual:
When a simple command is executed, the shell performs the following expansions, ...
- 309
2
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0
answers
216
views
How to trace script execution events
My goal:
To receive events from the kernel when a file/script is opened for execution with the absolute path of the file (or maybe the working directory, to resolve the absolute path of the file).
I ...
- 21
2
votes
1
answer
1k
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Why " >/dev/console" for remote beep (echo-command)
I've learned that this command:
echo -e "\a"
triggers a beep on the local system, whereas this command:
echo -e "\a" >/dev/console
triggers a beep on a remote system.
Why is this? What is the &...
- 29
4
votes
3
answers
823
views
Who runs the interpreter for files that are execute-only?
If the current user only has execute (--x) permissions on a file, under which user does the interpreter (specified by #!/path/to/interpreter at the beginning of the file) run?
It couldn't be the ...
- 290
0
votes
1
answer
377
views
What's the purpose of having "env [shell]" as an interpreter? [duplicate]
I already stumbled over #!/usr/bin/env bash on numerous occasions and never questioned it. Now, I'm wondering what the purpose of wrapping the shell interpreter in an env command, i.e. why not just ...
- 2,162
7
votes
3
answers
379
views
Is parsing scripts at script-runtime ubiquitous to shells or present in other interpreters and how does that work?
I had always thought that shells parse whole scripts, constructing an AST, and then execute that AST from memory. However, I just read a comment by Stéphane Chazelas, and tested executing this script, ...
- 4,590
1
vote
1
answer
2k
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Building "cross linux system" programs, with different libc/musl interpreter
My goal is simple: I would like to create a program that bootstraps the nix package manager on any architecture, as a non-root user, with as few depends as possible. For now, what I did is the ...
- 3,731
3
votes
2
answers
1k
views
xslt shbang: Using xslt from the command line
I have (foolishly?) written a couple of moderately general-purpose xslt
scripts.
I'd quite like to turn these into executables that read an xml document from standard in or similar.
The way you do ...
- 1,176
21
votes
6
answers
10k
views
Choose interpreter after script start e.g. if/else inside hashbang
Is there any way to dynamically choose the interpreter that's executing a script? I have a script that I'm running on two different systems, and the interpreter I want to use is located in different ...
- 459
6
votes
6
answers
6k
views
Run program at lower CPU speed?
It would be very useful for me to run specific programs in a Linux environment with a fixed (lower) CPU clock speed (say, runat 400mhz ./my-program --argument-of="my program" for getting that clock ...
- 252
6
votes
1
answer
1k
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Perl and Python wrongly interpreted via shebang on Linux
All my Python and Perl scripts are simply NOT iterpreted via shebang. Never. But they work as expected when I explicitly call the binary.
I double checked my Perl and Python installations, it is ...
- 63
4
votes
2
answers
8k
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Specifying a generic interpreter for a program like expect?
I am writing expect script which can be used on mulple operating systems but the problem is
i can't use #!/usr/bin/expect evreywhere so instead i tried to do
#!`which expect`
at the top but it ...
- 7,907
0
votes
2
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555
views
can something besides the shebang set the interpreter? [closed]
I'm running a script (in tmuxinator) that tries to source another script (rvm). rvm explicitly does not allow sourcing from sh. I didn't think that would be a problem, because the shebang in the ...
- 101
1
vote
3
answers
982
views
Is shebang always the same as the interpreter's installation directory?
Must the shebang header always match the interpreter's installation directory? If so, then why do both #!/usr/bin/python and #!/usr/local/bin/python work for me?
- 169