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There are also two commands, "dirname" and "basename", you might want to know about. Both are fed a pathname, "pathname" chops off everything up to the last "/" (thus leaving the filename without a...

$ pwd
/home/work
$ echo ${PWD##*/}
work

I'm not quite sure what you're even trying to do there.

The xargs utility converts streams into arguments, precisely what this problem needs. It can run awk once with many files(leave off the -n...

Quick solution, you could try:
ls a_*.out | sort -t_ -k2n |
while read f
do
cat "$f"
done |
awk '{arr[$1]=arr[$1] " " $2}END{for(i in arr)print i,arr[i]}'

--
Looking at your awk script,...

Or a bit shorter:
ls a_*.out | sort -t_ -k2n |
while read f
do
awk... "$f"
done

ls a_*.out > file_list
awk -F"[_.]" '{print $2" "$0}' file_list|sort -n|awk '{print $2}' > temp
mv temp > file_list
while read f
do
awk <your-program> "$f"
done < file_list