根据对列表合并文件

Question

I have files in a directory, and a list of pairs of filenames eg

list:
FileA File1
FileB File2
FileC File3

I would like to merge each pair of files into one file. I learned that it's possible to merge all files in a directory based on a list using this command

xargs < list.text cat > merged_file.txt

But I am not sure how to do this on a line by line basis (ie pairing up files) as in my case.

The resulting files should be called FileA_File1_merged.txt

Answer 1

Read the list file line by line, and cat files to a merged one:

while read line; do
        cat $line > "$line.merged"
done < list

Attention result file name will contain spaces and .merged "extension". To replace spaces w/ - you may use bash pattern replacement: ... >"${line/ /-}.merged" .