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Top Forums Shell Programming and Scripting For loop and read from different directories Post 303001191 by MadeInGermany on Saturday 29th of July 2017 03:08:19 AM
Old 07-29-2017
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.
This User Gave Thanks to MadeInGermany For This Post:
 

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PASTE(1)							   User Commands							  PASTE(1)

NAME
paste - merge lines of files SYNOPSIS
paste [OPTION]... [FILE]... DESCRIPTION
Write lines consisting of the sequentially corresponding lines from each FILE, separated by TABs, to standard output. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -d, --delimiters=LIST reuse characters from LIST instead of TABs -s, --serial paste one file at a time instead of in parallel --help display this help and exit --version output version information and exit GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report paste translation bugs to <http://translationproject.org/team/> AUTHOR
Written by David M. Ihnat and David MacKenzie. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for paste is maintained as a Texinfo manual. If the info and paste programs are properly installed at your site, the command info coreutils 'paste invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 PASTE(1)
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