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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)						    BSD General Commands Manual 						  PASTE(1)

NAME
paste -- merge corresponding or subsequent lines of files SYNOPSIS
paste [-s] [-d list] file ... DESCRIPTION
The paste utility concatenates the corresponding lines of the given input files, replacing all but the last file's newline characters with a single tab character, and writes the resulting lines to standard output. If end-of-file is reached on an input file while other input files still contain data, the file is treated as if it were an endless source of empty lines. The options are as follows: -d list Use one or more of the provided characters to replace the newline characters instead of the default tab. The characters in list are used circularly, i.e., when list is exhausted the first character from list is reused. This continues until a line from the last input file (in default operation) or the last line in each file (using the -s option) is displayed, at which time paste begins selecting characters from the beginning of list again. The following special characters can also be used in list: newline character tab character \ backslash character Empty string (not a null character). Any other character preceded by a backslash is equivalent to the character itself. -s Concatenate all of the lines of each separate input file in command line order. The newline character of every line except the last line in each input file is replaced with the tab character, unless otherwise specified by the -d option. If '-' is specified for one or more of the input files, the standard input is used; standard input is read one line at a time, circularly, for each instance of '-'. EXIT STATUS
The paste utility exits 0 on success, and >0 if an error occurs. EXAMPLES
List the files in the current directory in three columns: ls | paste - - - Combine pairs of lines from a file into single lines: paste -s -d ' ' myfile Number the lines in a file, similar to nl(1): sed = myfile | paste -s -d ' ' - - Create a colon-separated list of directories named bin, suitable for use in the PATH environment variable: find / -name bin -type d | paste -s -d : - SEE ALSO
cut(1), lam(1) STANDARDS
The paste utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. HISTORY
A paste command appeared in Version 32V AT&T UNIX. BSD
June 25, 2004 BSD
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