for loop on pair

[mathieu]

I'd like to be able to iterate over pairs. Something like (pseudo
shell script)

for i,j in file1,md51 \
file2,md52 \
file3,md53
do
compare(md5sum file $i, $j)
done

Thanks

[Andrew McDermott]

mathieu wrote:

for pair in file1,md51 \
file2,md52 \
file3,md53
do
i=${pair%,*}
j=${pair#*,}
compare(md5sum file $i, $j
done

Andrew

[Rakesh Sharma]

for var in file1,md51 \
file2,md52 \
file3,md53
do
IFS=','; set -f; set x $var; shift
compare(md5sum file "$1", "$2")
done

[Janis Papanagnou]

Here's a code frame...

while read -r md5 f
do
set -- $( md5sum "$f" )
case $1 in
$md5)
printf "Match: md5('%s') is '%s'\n" \
"$f" "$md5" ;;
*) printf "Mismatch: md5('%s') is '%s' but expected '%s'\n" \
"$f" "$md5" "$1" ;;
esac
done

And depending how you want to provide the data pairs...

1) a process generates the md5sum/file pairs

md5sum *.txt *.pdf |
while
# while loop as above
done

2) reading the md5sum/file pairs list from a file

while
# while loop as above
done < file_with_pairs

3) hard coded md5sum/file pairs within the script

while
# while loop as above
done << EOT
a8d67af107b327e1e47795b52762ad18 hello_world.c
190932301eefaae68607941f33ac474c hi_there.txt
EOT

(The usual caveats apply.)

Janis

>
> Thanks