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refactor: use grep -E/-F instead of fgrep/egrep `egrep` and `fgrep` are obsolescent now. This PR updates all `egrep` and `fgrep` commands to `grep -E` and `grep -F`. Running egrep/fgrep command with grep v3.8 will output the following warning to stderr: ``` egrep: warning: egrep is obsolescent; using grep -E ``` - https://www.phoronix.com/news/GNU-Grep-3.8-Stop-egrep-fgrep - https://lists.gnu.org/archive/html/info-gnu/2022-09/msg00001.html