On 12/28/2016 05:55 AM, Robert Nichols wrote:
On 12/28/2016 01:02 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 $line
done < some_file.txt
for when more than 1 file is involved, it is not so easy ...
JD,
If using the bash, you could introduce file descriptors for each file
you are reading from ( set the fie descriptor by using the exec
command) and then read using the -u option for each file.
Indeed! I was just working on a script that has lines like:
exec 3< <(gunzip -fc "$Infile_1z" | tr '\0' '\n')
exec 4< "$Infile_2"
...
while [[ various_conditions ]]; do
read -r -u 3 Data1 || break
read -r -u 4 Data2 || { echo "EOF on $Infile_2"; exit 1; }
...
done
The reads stay in sync just fine.
Ala Jon LaBadie's example:
exec 5< .kshrc
exec 6< .profile while read -u 5 one && read -u 6 two
do
echo $one
echo $two
done
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