For loop and read from different directories Post: 303001379

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Top Forums Shell Programming and Scripting For loop and read from different directories Post 303001379 by baris35 on Wednesday 2nd of August 2017 03:40:28 PM

08-02-2017

Registered User

Hello All,
Thanks for your comments.

I'd like to inform you that MadeInGermany's script worked out as expected.
As I am not familiar with different kind of softwares/scripts etc, I am unable to provide feedback about the output of other alternatives.

Quote:

Originally Posted by MadeInGermany

The following bash script is typed from a mobile device and untested.
It uses 3 extra file handles, so it can read in a round-robin order.

Code:

while
  read a <&3; aexit=$?
  read b <&4; bexit=$?
  read c <&5; cexit=$?
  [ $aexit -eq 0 ] || [ $bexit -eq 0 ] || [ $cexit -eq 0 ]
do
  [ $aexit -eq 0 ] && printf "%s\n" "$a"
  [ $bexit -eq 0 ] && printf "%s\n" "$b"
  [ $cexit -eq 0 ] && printf "%s\n" "$c"
done 3< <( ls A/ ) 4< <( ls B/ ) 5< <( ls C/ )

and produces the following order

Code:

directory A, file 1.txt
directory B, file a.txt
directory C, file 101.txt
directory A, file 2.txt
directory B, file b.txt
directory C, file 102.txt
...

Improvements are welcome.

Thank You All for your valuable comments / recommendations

Kind regards
Boris

baris35

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