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Yes. Reverse the order in which the files are processed. Read the serial numbers first, using them as keys in an array. Then when reading the xls test if $1 is a key in the array. Modify the line...

Try: awk 'NR==FNR{id=$2;sub("ID-","",id);a[id]=$0;next}/^>/{id=$1;sub(">","",id);$0=$1" | "a[id]}1' file1 file2

Remove the "$" sign and try

.... <Shell script snipped> ...
a_programmer's shell for loop is far better.

Perl globbing example follows -

You can iterate through all files named "Data.txt" in the Perl program itself,...

Simply pass full/relative paths with directory name to your perl script. (This is assuming your perl script does not expect the file to be in the current working directory).


## Assuming the...