2

env displays a list of all environment variables

$ env |wc -l
63

Total environment variables = 63

According to help export

-p   display a list of all exported variables and functions

$export -p |wc -l 
63

Environment variables+lines of functions=63 then lines of functions=0

set disply a list of environment variables+ shell variables+functions

$set |wc -l
4772

Then for showing only variables(environment variables+shell variables)

$(set -o posix ;set)|wc -l
172

It means lines of functions= 4772-172 not zero please explain to me what's happening?

  • 1
    Each function spans multiple lines, counting number of lines is plain wrong. Also i don't understand what is tripping you up here if you know the difference between environment variable and shell variable. – heemayl Oct 17 '16 at 13:10
  • I want to know why the result of export -p and env are the same! it means ,we have no functions? – Sinoosh Oct 17 '16 at 13:14
2

The confusion arises from the fact that export -p by default only shows exported variables (declare -x), not functions.

To display the exported functions (declare -fx) using export:

export -fp

Also just to clarify, counting number of lines to get number of functions is completely wrong as function definitions span multiple lines (even if it defined in a single line while declaring, set shows them in multiple lines).

|improve this answer|||||
  • thanks,why in ´help export´ write like that? – Sinoosh Oct 17 '16 at 16:27
  • 1
    @Sinoosh Hmmmm, i wonder too. I will dig deeper when i get a chance. – heemayl Oct 18 '16 at 6:04

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