Mdthbs

How do credit card companies know what type of business I'm paying for?

At zero velocity, is this object neither speeding up nor slowing down?

My parents claim they cannot pay for my college education; what are my options?

Can an open source licence be revoked if it violates employer's IP?

Using roof rails to set up hammock

What made the Ancient One do this in Endgame?

Co-worker is now managing my team. Does this mean that I'm being demoted?

Sakkāya-Ditthi and Self-View

Why is gun control associated with the socially liberal Democratic party?

Struggling to present results from long papers in short time slots

The last tree in the Universe

Should I worry about having my credit pulled multiple times while car shopping?

Boss making me feel guilty for leaving the company at the end of my internship

Should I email my professor to clear up a (possibly very irrelevant) awkward misunderstanding?

What does the output current rating from an H-Bridge's datasheet really mean?

What should I be aware of in buying second-hand sinks and toilets?

What did the 8086 (and 8088) do upon encountering an illegal instruction?

How do I become a better writer when I hate reading?

Do items with curse of vanishing disappear from shulker boxes?

Dedicated bike GPS computer over smartphone

Why is Skinner so awkward in Hot Fuzz?

Bullying by school - Submitted PhD thesis but not allowed to proceed to viva until change to new supervisor

How to search for Android apps without ads?

Threading data on TimeSeries

Is it possible for a function to distinguish if it is run like this? “${@}”

Using xargs with input from a fileHow can a Bash script tell how it was run?Wait for key in shell script that may get piped to /bin/bashRunning repetitive task through Bash scriptIs this a bug in bash? `return` doesn't quit function if called from a pipeBash script works via terminal but not via main menuRETURN trap in Bash not executing for functionEnabling Functions in a Config file for script to run Bash Shellscriptbash: Boolean math and unary '!'I cannot get the PID for this “${@}” 1> >(2log) 2> >(2log2scr | tee >&2)

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

This is my simplified script.

I am wondering if the proc() can know if it is run directly or through the runner.

#!/bin/bash

runner () {

    "${@}"

}

proc() {

    eval 'version=$(echo "SUCCESS: **** ${BASH_VERSION} ****")'

    echo -e "$version"; 

    return 0

}



runner proc

proc

What do you think?

bash shell-script scripting

share|improve this question

edited 1 hour ago

conanDrum

asked 1 hour ago

conanDrumconanDrum

596

add a comment | 

0

This is my simplified script.

I am wondering if the proc() can know if it is run directly or through the runner.

#!/bin/bash

runner () {

    "${@}"

}

proc() {

    eval 'version=$(echo "SUCCESS: **** ${BASH_VERSION} ****")'

    echo -e "$version"; 

    return 0

}



runner proc

proc

What do you think?

bash shell-script scripting

share|improve this question

edited 1 hour ago

conanDrum

asked 1 hour ago

conanDrumconanDrum

596

add a comment | 

This is my simplified script.

I am wondering if the proc() can know if it is run directly or through the runner.

#!/bin/bash

runner () {

    "${@}"

}

proc() {

    eval 'version=$(echo "SUCCESS: **** ${BASH_VERSION} ****")'

    echo -e "$version"; 

    return 0

}



runner proc

proc

What do you think?

bash shell-script scripting

share|improve this question

edited 1 hour ago

conanDrum

asked 1 hour ago

conanDrumconanDrum

596

#!/bin/bash

runner () {

    "${@}"

}

proc() {

    eval 'version=$(echo "SUCCESS: **** ${BASH_VERSION} ****")'

    echo -e "$version"; 

    return 0

}



runner proc

proc

share|improve this question

edited 1 hour ago

conanDrum

asked 1 hour ago

conanDrumconanDrum

596

share|improve this question

edited 1 hour ago

conanDrum

asked 1 hour ago

conanDrumconanDrum

596

asked 1 hour ago

conanDrumconanDrum

596

asked 1 hour ago

conanDrumconanDrum

596

1 Answer
1

active

oldest

votes

2

proc is not a separate process in your example. It's just a function, run in the same process as the main shell.

The $FUNCNAME array gives it access to its backtrace:

foo(){ bar; }

bar(){ baz; }

baz(){ proc; }

proc(){ echo "${FUNCNAME[@]}"; }



$ foo

proc baz bar foo main

So yes, it can:

case ${FUNCNAME[1]} in runner) ...

If you experiment with it, you will see that running it in a subshell / subprocess doesn't break the backtrace or affect it in any way:

foo(){ (bar &) | cat; }

=> same output

share|improve this answer

edited 6 mins ago

Jeff Schaller♦

46.6k1167152

answered 1 hour ago

mosvymosvy

13.6k21546

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  true, I clarified my title. let me check what I can do with your info. thanks a bunch
  
  – conanDrum
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've added an example test and a note about functions, backtraces & subprocesses
  
  – mosvy
  58 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  excellent mosvy thanks mate
  
  – conanDrum
  34 mins ago
  

  
  
  
  

add a comment | 

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f524793%2fis-it-possible-for-a-function-to-distinguish-if-it-is-run-like-this%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

2

proc is not a separate process in your example. It's just a function, run in the same process as the main shell.

The $FUNCNAME array gives it access to its backtrace:

foo(){ bar; }

bar(){ baz; }

baz(){ proc; }

proc(){ echo "${FUNCNAME[@]}"; }



$ foo

proc baz bar foo main

So yes, it can:

case ${FUNCNAME[1]} in runner) ...

If you experiment with it, you will see that running it in a subshell / subprocess doesn't break the backtrace or affect it in any way:

foo(){ (bar &) | cat; }

=> same output

share|improve this answer

edited 6 mins ago

Jeff Schaller♦

46.6k1167152

answered 1 hour ago

mosvymosvy

13.6k21546

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  true, I clarified my title. let me check what I can do with your info. thanks a bunch
  
  – conanDrum
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've added an example test and a note about functions, backtraces & subprocesses
  
  – mosvy
  58 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  excellent mosvy thanks mate
  
  – conanDrum
  34 mins ago
  

  
  
  
  

add a comment | 

2

proc is not a separate process in your example. It's just a function, run in the same process as the main shell.

The $FUNCNAME array gives it access to its backtrace:

foo(){ bar; }

bar(){ baz; }

baz(){ proc; }

proc(){ echo "${FUNCNAME[@]}"; }



$ foo

proc baz bar foo main

So yes, it can:

case ${FUNCNAME[1]} in runner) ...

If you experiment with it, you will see that running it in a subshell / subprocess doesn't break the backtrace or affect it in any way:

foo(){ (bar &) | cat; }

=> same output

share|improve this answer

edited 6 mins ago

Jeff Schaller♦

46.6k1167152

answered 1 hour ago

mosvymosvy

13.6k21546

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  true, I clarified my title. let me check what I can do with your info. thanks a bunch
  
  – conanDrum
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've added an example test and a note about functions, backtraces & subprocesses
  
  – mosvy
  58 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  excellent mosvy thanks mate
  
  – conanDrum
  34 mins ago
  

  
  
  
  

add a comment | 

proc is not a separate process in your example. It's just a function, run in the same process as the main shell.

The $FUNCNAME array gives it access to its backtrace:

foo(){ bar; }

bar(){ baz; }

baz(){ proc; }

proc(){ echo "${FUNCNAME[@]}"; }



$ foo

proc baz bar foo main

So yes, it can:

case ${FUNCNAME[1]} in runner) ...

If you experiment with it, you will see that running it in a subshell / subprocess doesn't break the backtrace or affect it in any way:

foo(){ (bar &) | cat; }

=> same output

share|improve this answer

edited 6 mins ago

Jeff Schaller♦

46.6k1167152

answered 1 hour ago

mosvymosvy

13.6k21546

foo(){ bar; }

bar(){ baz; }

baz(){ proc; }

proc(){ echo "${FUNCNAME[@]}"; }



$ foo

proc baz bar foo main

case ${FUNCNAME[1]} in runner) ...

foo(){ (bar &) | cat; }

=> same output

share|improve this answer

edited 6 mins ago

Jeff Schaller♦

46.6k1167152

answered 1 hour ago

mosvymosvy

13.6k21546

edited 6 mins ago

Jeff Schaller♦

46.6k1167152

edited 6 mins ago

Jeff Schaller♦

46.6k1167152

answered 1 hour ago

mosvymosvy

13.6k21546

answered 1 hour ago

mosvymosvy

13.6k21546