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What do you mean by loop does not jump out?

1. Put the script in a file:
cat > cut_file.sh
#!/bin/bash

c=0
while read line
do
if [[ "$line" =~ "^f e.*" ]]
then
...

awk '/^f e.*/{close(F);++c; F="f"c".txt"; next } { print $0 > F; }' a.txt