Shell Programming and Scripting

ABC_NYFWFX.txt
ABC_NYFQTFX.txt
ABC_NYFMAFX.txt
ABC_NYFAVFX.txt
ABC_CYFWFX.txt
ABC_CYFQTFX.txt
ABC_CYFMAFX.txt
ABC_CYFAVFX.txt
ABC_CYBWFX.txt

ABC_TYFWFX.txt
ABC_TYFQTFX.txt
ABC_TYFMAFX.txt
ABC_TYFAVFX.txt
ABC_TYBWFX.txt

for identifier in WFX QTFX MAFX AVFX FWX
do
   cat ABC_NYF${identifier}.txt ABC_CYF${identifier}.txt  >  ABC_TYF${identifier}.txt
done

for i in ABC_C*; do echo cat $i ${i/_C/_N} ">" ${i/_C/_T}; done
cat ABC_CYBWFX.txt ABC_NYBWFX.txt > ABC_TYBWFX.txt
cat ABC_CYFAVFX.txt ABC_NYFAVFX.txt > ABC_TYFAVFX.txt
cat ABC_CYFMAFX.txt ABC_NYFMAFX.txt > ABC_TYFMAFX.txt
cat ABC_CYFQTFX.txt ABC_NYFQTFX.txt > ABC_TYFQTFX.txt
cat ABC_CYFWFX.txt ABC_NYFWFX.txt > ABC_TYFWFX.txt