Usacases:
$ ls
log_1.json log_2.json warn_3.json error_3.json README.md
$ mvp \$1_\$2.json \$2_\$1.json
$ ls
1_log.json 2_log.json 3_warn.json 3_error.json README.md`
Use $<number> like $1 $2 etc to match patterns and use these matched patterns in the new file names.
If you have files like log_2023-08-22_dev.json warn_2023-08-22_prod.json warn_2023-08-23_stage.json. They clearly
have this pattern <log level>_<date>_<environment>.json. Use mvp to match these.
The pattern \$1_\$2_\$3.json will replace $1 with the log level, $2 with the date and $3 with the
environment. We might be interested in a new naming. Something like <environment>_<log level>_<date>.json
Before:
## Before mvp
$ ls
log_2023-08-22_dev.json warn_2023-08-22_prod.json warn_2023-08-23_stage.json
$ mvp \$1_\$2_\$3.json \$3_\$1_\$2.json
## After mvp
$ ls
dev_log_2023-08-22.json prod_warn_2023-08-22.json stage_warn_2023-08-23.json