[Help-bash] getline awk

[Gérard ROBIN]

Hello,
getline is strange (in awk)

when I run this script:
#-------------------------------- begin -----------------------------
1 #!/bin/bash
2
3 awk 'BEGIN { getline; print $1 ;getline; print $2}' fich2.txt
#-------------------------------- end -------------------------------

cat fich2.txt

line1-field-1 line1-field-2 line1-field-3 line1-field-4 line1-field-5

line2-field-1 line2-field-2 line2-field-3 line2-field-4 line2-field-5

line3-field-1 line3-field-2 line3-field-3 line3-field-4 line2-field-5

line4-field-1 line4-field-2 line4-field-3 line4-field-4 line4-field-5

I get:

line1-field-1

If I write the line 3 : 
awk 'BEGIN { getline; print $1 ;getline; getline; print $2}' fich2.txt

I get: (as expected)

line1-field-1
line2-field-2

Now I run the script:

#---------------------------i--------- begin ---------------------------------
#/bin/bash

ls -lSr --time-style=long-iso | awk 'BEGIN { getline; print; getline; print }' 
#-------------------------------------- end -----------------------------------

With:

ls -lSr --time-style=long-iso 

total 940
-rw-r--r-- 1 user1 user1      0 2018-12-24 13:12 tmp1.txt
-rw-r--r-- 1 user1 user1      3 2018-11-08 18:48 perslines
..........................................................
..........................................................

I get: (as expected)

total 940
-rw-r--r-- 1 user1 user1      0 2018-12-24 13:12 tmp1.txt

in this case no need for two getline to have the expected result.

Why this difference in behavior of getline?

Thank you in advance for your answer.

-- 
Gerard
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