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Full Discussion: How to make paste -d second file print down while looping?
Top Forums UNIX for Beginners Questions & Answers How to make paste -d second file print down while looping? Post 303038297 by bigvito19 on Thursday 29th of August 2019 07:27:11 PM
Old 08-29-2019
Quote:
Originally Posted by Corona688
One way:
Code:
#!/bin/bash

# Create temporary file to hold newlines
touch /tmp/$$

# Open both files to read line-by-line
exec 5<file1
exec 6<file2

# Read lines from both until file2 runs out
while read LINE <&6 && read LINE <&5
do
        :
done

# Run loop same number of times as lines left in file1.
while read LINE <&5
do
        cat /tmp/$$ file2 | paste file1 /dev/stdin
        echo >> /tmp/$$
        echo
done

cat /tmp/$$ file2 | paste file1 /dev/stdin


rm -f /tmp/$$ # Delete temporary file
# Close file descriptors
exec 5>&-
exec 6>&-

Re-looping I'm less certain of. Perhaps the files themselves should be generated at need. How large are they in a non-trivial example?
Thank you for the reply,

Re-looping mean just looping through the list again, the files are over 20gbs.

and how to take the space out between the files to merge them together?
Last edited by bigvito19; 08-29-2019 at 10:26 PM..
 

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LEARN ABOUT DEBIAN

break

break(3tcl)						       Tcl Built-In Commands						       break(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       break - Abort looping command

SYNOPSIS

       break
_________________________________________________________________

DESCRIPTION

       This command is typically invoked inside the body of a looping command such as for or foreach or while.	It returns a TCL_BREAK code, which
       causes a break exception to occur.  The exception causes the current script to be aborted out to the  innermost	containing  loop  command,
       which  then aborts its execution and returns normally.  Break exceptions are also handled in a few other situations, such as the catch com-
       mand, Tk event bindings, and the outermost scripts of procedure bodies.

EXAMPLE

       Print a line for each of the integers from 0 to 5:
	      for {set x 0} {$x<10} {incr x} {
		 if {$x > 5} {
		    break
		 }
		 puts "x is $x"
	      }

SEE ALSO

       catch(3tcl), continue(3tcl), for(3tcl), foreach(3tcl), return(3tcl), while(3tcl)

KEYWORDS

       abort, break, loop

Tcl																       break(3tcl)
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