On 12/28/2016 12:02 AM, Joachim Backes wrote:
On 12/27/2016 11:49 PM, JD wrote:
Reading lines from 2 files in such a way that each iteration
lets me read the next line from each file so that the items
read from each file are in sync as far as line number is concerned.
Is this "doable"?
For a single file, indexing to next line is automatic, visa vis
while read line; do
echo $line
done < some_file.txt
for when more than 1 file is involved, it is not so easy ...
JD,
If using the bash, you could introduce file descriptors for each file
you are reading from ( set the fie descriptor by using the exec
command) and then read using the -u option for each file.
Kind regards
Joachim Backes
Hypothetical (of course, non-working example):
export index=1
while true do;
file_A_line=`read line$index` # Read from file A
file_B_line=`read line$index` # read from file B
[ x$file_A_line = x -o x$file_B_line = x ] && break
<do something withfile_A_line and file_B_line>
index=`expr $index + 1`
done
So how can the reading from 2 files be accomplished and keep the index
to next line in sync?
I know it is a no brainer with a C program.
Thanx.
Yep.
Jon LaBadie introduced me to:
exec 5< .kshrc
exec 6< .profile
while read -u 5 one && read -u 6 two; do
echo $one
echo $two
done
_______________________________________________
users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
