bash how to redirect output from a function to /dev/null

Question

I have a script with some functions (~/func/functions.sh) and I have the other script (~/scripts/example.sh)

Code: functions.sh

 #!/bin/bash
 function NameofFunction()
 {
  # do something...
  echo -e "\e[31m[ ERROR ]\e[39m more text..." 1>&2
  }

Code: example.sh (work well)

#!/bin/bash

. ~/func/functions.sh
function functioninExample()
{
#do something...
NameofFunction ${VAR1} ${VAR2}

}

functioninExample 2>/dev/null

Code: example.sh (doesn't work)

#!/bin/bash

. ~/func/functions.sh
function functioninExample()
{
#do something...
NameofFunction ${VAR1} ${VAR2} 2>/dev/null

}

functioninExample

How can I redirect the echo from my function without editing the function?

NameofFunction ${VAR1} ${VAR2} 2>/dev/null

doesn't work.

How can I redirect the echo from my function without redirecting the functioninExample function?

Could you please change `${VAR1}, ${VAR2}` to some real strings and show us what is your function printing exactly? — rudimeier, Sep 28 '16 at 13:15
example for ${VAR1} 50000 and for ${VAR2} 2000 i start some pearl scripts and check the arguments of my script — FaxMax, Sep 28 '16 at 21:34

rudimeier · Accepted Answer · 2016-09-28T13:46:44.660

5

This is because your function is printing to stdout not stderr, try

NameofFunction ${VAR1} ${VAR2} >/dev/null

or redirect both stderr and stdout:

NameofFunction ${VAR1} ${VAR2} >/dev/null 2>&1

Note it's good style to print errors to stderr, so instead of my answer above you should better change your function, like this:

echo -e "\e[31m[ ERROR ]\e[39m more text..." 1>&2

edited Sep 28 '16 at 13:46

answered Sep 28 '16 at 13:08

rudimeier

Hi, this dosnt work, i tested it before – FaxMax Sep 28 '16 at 13:11
@FaxMax Using the exact code you posted it worked for me, please make a minimal example that actually doesn't work. – Random832 Sep 28 '16 at 14:27
@Random832 you are right, i testet it with 2 new files, i updated my question. thanks! – FaxMax Sep 28 '16 at 15:59
@FaxMax Both of your examples still work for me. What does it do, and are you actually running your examples to confirm that they don't work? If whatever you're _really_ doing isn't working, maybe the problem is in something you cut out for the examples. – Random832 Sep 28 '16 at 18:52

1 Answers1