Fix: egrep is obsolescent, use grep -E
See e.g., egrep(1) [https://linux.die.net/man/1/egrep]: > two variant programs egrep and fgrep are available. egrep is the same > as grep -E. fgrep is the same as grep -F. Direct invocation as either > egrep or fgrep is deprecated See also the rationale of the POSIX description of grep (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html): > This grep has been enhanced in an upwards-compatible way to provide > the exact functionality of the historical egrep and fgrep commands as > well. It was the clear intention of the standard developers to > consolidate the three greps into a single command. Closes: #839
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