You could have a file with functions binding, for example, `grep` to `my_grep`, then `source` that file in a subshell: ( source with_my_prefix.sh cat fil

You could have a file with functions binding, for example, `grep` to `my_grep`, then `source` that file in a subshell: ( source with_my_prefix.sh cat file | grep phrase | sort | send | end_with | cat )