Replaces egrep with grep -E in gvm_export_path function

`egrep` is listed as deprecated and in Fedora 38, is outputting the message "warnin: egrep is obsolescent". According to #431, the official release notes from Grep 3.8 state egrep has been deprecated since 2007.

This PR replaces `egrep` in gvm_export_path with `grep -E`.

`egrep` is mentioned in a couple of the files in `./examples/native/`, but as I don't think they're critical to the use of GVM, I have not attempted to replace them.

Fixes #431

Signed-off-by: Chris Collins <[email protected]>

Author: clcollins

scripts/function/gvm_export_path

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 function gvm_export_path() {
-	export PATH="$GVM_ROOT/bin:$(echo "$PATH" | $TR_PATH ":" "\n" | "$GREP_PATH" -v '^$' | $EGREP_PATH -v "$GVM_ROOT/(pkgsets|gos|bin)" | $TR_PATH "\n" ":" | $SED_PATH 's/:*$//')"
+	export PATH="$GVM_ROOT/bin:$(echo "$PATH" | $TR_PATH ":" "\n" | "$GREP_PATH" -v '^$' | "$GREP_PATH" -E -v "$GVM_ROOT/(pkgsets|gos|bin)" | $TR_PATH "\n" ":" | $SED_PATH 's/:*$//')"
 	export GVM_PATH_BACKUP="$PATH"
 }
 

scripts/function/tools

@@ -3,7 +3,6 @@ LS_ERROR="GVM couldn't find ls"
 TR_ERROR="GVM couldn't find tr"
 SED_ERROR="GVM couldn't find sed"
 GREP_ERROR="GVM couldn't find grep"
-EGREP_ERROR="GVM couldn't find egrep"
 SORT_ERROR="GVM couldn't find sort"
 HEAD_ERROR="GVM couldn't find head"
 HEXDUMP_ERROR="GVM couldn't find hexdump"
@@ -12,7 +11,6 @@ LS_PATH=$(unalias ls &> /dev/null; command -v ls) || display_error "$LS_ERROR" |
 TR_PATH=$(unalias tr &> /dev/null; command -v tr) || display_error "$TR_ERROR" || return 1
 SED_PATH=$(unalias sed &> /dev/null; command -v sed) || display_error "$SED_ERROR" || return 1
 GREP_PATH=$(unalias grep &> /dev/null; command -v grep) || display_error "$GREP_ERROR" || return 1
-EGREP_PATH=$(unalias egrep &> /dev/null; command -v egrep) || display_error "$EGREP_ERROR" || return 1
 SORT_PATH=$(unalias sort &> /dev/null; command -v sort) || display_error "$SORT_ERROR" || return 1
 HEAD_PATH=$(unalias head &> /dev/null; command -v head) || display_error "$HEAD_ERROR" || return 1
 HEXDUMP_PATH=$(unalias hexdump &> /dev/null; command -v hexdump) || display_error "$HEXDUMP_ERROR" || return 1