In the Linux system, you can use the grep command combined with regular expressions to filter out the commented out parts of the file content.
The specific method is as follows:
1. Use the "-v" parameter of grep to reverse the selection and filter out the comment lines.
For example to filter comments in python files:
grep -v "^#" python_file.py
2. Use regular expressions to match comment symbols, and then filter.
Filter comments in C language files:
grep -v "^/\*" file.c | grep -v "\*/"
or:
grep -v "\/\*" file.c | grep -v "\*\/"
3. For comments in shell scripts, you can filter to include "#":
grep -v "^#" shell.sh
4. For sql statement comments starting with ";", you can use:
grep -v "^;" sql.txt
5. You can also use the delete function of the sed editor:
sed '/^\/\*/,/\*\//d' file.c
sed '/^--/d' file