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Multiple FOR;Singe DO statement

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# 1  
Old 09-15-2015
Multiple FOR;Singe DO statement
Hi guys,

I'm trying to send variable commands from 2 different files but I'm not figuring out how to put 2 "i" variables into the command, can anyone help?

This is what is done when I read only 1 file:
Code:
for i in $(file1.txt);do echo "$i "

I'm trying to echo 2 variables, matching the lines from each of them. Both txt files have the same number of lines.

Code:
for i in $(file1.txt);for e in $(file2.txt);do echo "$i and $e"

Thanks!
# 2  
Old 09-15-2015
for doesn't read lines. You don't want to use it that way.

read can be used to read lines reliably.

More than one stream makes it more complicated than reading from stdin, but you can open both files, read from them separately each loop, and close afterwards.
Try

Code:
# Open these two files into file descriptors 5 and 6
# 0 is stdin, 1 is stdout, 2 is stderr, higher numbers generally kept free for us
exec 5<file1
exec 6<file2

while IFS="" read -r LINE1 <&5 && IFS="" read -r LINE2 <&6
do
        echo "Line 1 is $LINE1 and line2 is $LINE2"
done

# Close files
exec 5<&-
exec 6<&-

This User Gave Thanks to Corona688 For This Post:
sea
# 3  
Old 09-15-2015
You can also make the redirection local to the while loop :

Code:
while IFS= read -r line1 && IFS= read -r line2<&3
do 
  printf "%s\n" "\$line1: $line1" "\$line2: $line2" 
done <file1 3<file2

These 2 Users Gave Thanks to Scrutinizer For This Post:
Corona688 sea
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