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I am learning shell scripting through some online tutorials and I came to the following script that declares differences of global and local variables.

#!/bin/bash
# Experimenting with variable scope
var_change () {
  local var1='local 1'
  echo Inside function: var1 is $var1 : var2 is $var2
  var1='changed again'
  var2='changed again'
}

var1='global 1'
var2='global 2'

echo Before function call: var1 is $var1 : var2 is $var2

var_change

echo After function call: var1 is $var1 : var2 is $var2

And the output is:

Before function call: var1 is global 1 : var2 is global 2

 

Inside function: var1 is local 1 : var2 is global 2

 

After function call: var1 is global 1 : var2 is changed again

My Question...

Why is var1 after the function call "global 1" instead of "changed again"? Can someone explain?

I am learning shell scripting through some online tutorials and I came to the following script that declares differences of global and local variables.

#!/bin/bash
# Experimenting with variable scope
var_change () {
  local var1='local 1'
  echo Inside function: var1 is $var1 : var2 is $var2
  var1='changed again'
  var2='changed again'
}

var1='global 1'
var2='global 2'

echo Before function call: var1 is $var1 : var2 is $var2

var_change

echo After function call: var1 is $var1 : var2 is $var2

And the output is:

Before function call: var1 is global 1 : var2 is global 2

Inside function: var1 is local 1 : var2 is global 2

After function call: var1 is global 1 : var2 is changed again

My Question...

Why is var1 after the function call "global 1" instead of "changed again"? Can someone explain?

I am a newbie learning shell scripting through some online tutorials and I came to the following script that declares differences of global and local variables.

#!/bin/bash
# Experimenting with variable scope
var_change () {
  local var1='local 1'
  echo Inside function: var1 is $var1 : var2 is $var2
  var1='changed again'
  var2='changed again'
}

var1='global 1'
var2='global 2'

echo Before function call: var1 is $var1 : var2 is $var2

var_change

echo After function call: var1 is $var1 : var2 is $var2

And the output is:

Before function call: var1 is global 1 : var2 is global 2

Inside function: var1 is local 1 : var2 is global 2

After function call: var1 is global 1 : var2 is changed again

My Question...

Why is var1 after the function call "global 1" instead of "changed again"? Can someone explain?

Thank you.

I am learning shell scripting through some online tutorials and I came to the following script that declares differences of global and local variables.

#!/bin/bash
# Experimenting with variable scope
var_change () {
  local var1='local 1'
  echo Inside function: var1 is $var1 : var2 is $var2
  var1='changed again'
  var2='changed again'
}

var1='global 1'
var2='global 2'

echo Before function call: var1 is $var1 : var2 is $var2

var_change

echo After function call: var1 is $var1 : var2 is $var2

And the output is:

Before function call: var1 is global 1 : var2 is global 2

Inside function: var1 is local 1 : var2 is global 2

After function call: var1 is global 1 : var2 is changed again

My Question...

Why is var1 after the function call "global 1" instead of "changed again"? Can someone explain?

I am a newbie learning shell scripting through some online tutorials and I came to the following script that declares differences of global and local variables.

#!/bin/bash
# Experimenting with variable scope
var_change () {
  local var1='local 1'
  echo Inside function: var1 is $var1 : var2 is $var2
  var1='changed again'
  var2='2 changed again'
}

var1='global 1'
var2='global 2'

echo Before function call: var1 is $var1 : var2 is $var2

var_change

echo After function call: var1 is $var1 : var2 is $var2

And the output is:

Before function call: var1 is global 1 : var2 is global 2

Inside function: var1 is local 1 : var2 is global 2

After function call: var1 is global 1 : var2 is changed again

My question is why var1 after function call is "global 1" instead of "changed again"? Can someone explain?

Thank you.

I am a newbie learning shell scripting through some online tutorials and I came to the following script that declares differences of global and local variables.

#!/bin/bash
# Experimenting with variable scope
var_change () {
  local var1='local 1'
  echo Inside function: var1 is $var1 : var2 is $var2
  var1='changed again'
  var2='changed again'
}

var1='global 1'
var2='global 2'

echo Before function call: var1 is $var1 : var2 is $var2

var_change

echo After function call: var1 is $var1 : var2 is $var2

And the output is:

Before function call: var1 is global 1 : var2 is global 2

Inside function: var1 is local 1 : var2 is global 2

After function call: var1 is global 1 : var2 is changed again

My Question...

Why is var1 after the function call "global 1" instead of "changed again"? Can someone explain?

Thank you.