diff --git a/bin/mktmpdir b/bin/mktmpdir
index 758c4c75..161b617d 100755
--- a/bin/mktmpdir
+++ b/bin/mktmpdir
@@ -44,7 +44,7 @@ contemplate_dirs()
 # hasher emits no meaningful errors regarding those, sigh
 check_options()
 {
-	! egrep -q "^$1 $2 .*no(dev|exec)" /proc/mounts
+	! grep -E -q "^$1 $2 .*no(dev|exec)" /proc/mounts
 }
 
 # pick existing, writeable, >256M free space dirs
diff --git a/bin/tags2lists b/bin/tags2lists
index ad478776..35737cfa 100755
--- a/bin/tags2lists
+++ b/bin/tags2lists
@@ -33,4 +33,4 @@ transformed="$(sed \
 [ -z "$transformed" ] ||
 	find $transformed \
 	| sed 's,^\./,,' \
-	| egrep -v '(\.sw.|~)$'
+	| grep -E -v '(\.sw.|~)$'
diff --git a/features.in/lowmem/install2/image-scripts.d/85-cleanup-lowmem b/features.in/lowmem/install2/image-scripts.d/85-cleanup-lowmem
index 0b472483..f0577eb5 100755
--- a/features.in/lowmem/install2/image-scripts.d/85-cleanup-lowmem
+++ b/features.in/lowmem/install2/image-scripts.d/85-cleanup-lowmem
@@ -19,7 +19,7 @@ cd /usr/share/X11/locale &&
 # xkb; don't drop "pc" yet
 cd /usr/share/X11/xkb/symbols &&
 	ls \
-	| egrep -v 'by|en|kz|pt|ru|ua|us|pc|....*' \
+	| grep -E -v 'by|en|kz|pt|ru|ua|us|pc|....*' \
 	| xargs rm -rf --
 
 # gconv
@@ -30,7 +30,7 @@ cd /usr/lib*/gconv &&
 for dir in /usr/{lib*,share}/locale; do
 	cd "$dir" && \
 	ls \
-	| egrep -v '^be|en|kk|pt|ru|uk' \
+	| grep -E -v '^be|en|kk|pt|ru|uk' \
 	| xargs rm -rf --;
 done
 
diff --git a/features.in/services/install2/image-scripts.d/10-services b/features.in/services/install2/image-scripts.d/10-services
index e6ac1f0c..7a3fb059 100755
--- a/features.in/services/install2/image-scripts.d/10-services
+++ b/features.in/services/install2/image-scripts.d/10-services
@@ -19,7 +19,7 @@ switch() {
 	sname="${sname%.socket}"
 
 	[ -n "$CHECK_FILES" ] && \
-		egrep -qs "^[[:blank:]]*$sname(.service|.socket)?[[:blank:]]*$" \
+		grep -E -qs "^[[:blank:]]*$sname(.service|.socket)?[[:blank:]]*$" \
 			$CHECK_FILES && return ||:
 
 	# avoid service duplication: drop sevice without unit type
diff --git a/features.in/x11-autologin/rootfs/image-scripts.d/40-x11-autologin b/features.in/x11-autologin/rootfs/image-scripts.d/40-x11-autologin
index 1853f57c..553cb6b2 100755
--- a/features.in/x11-autologin/rootfs/image-scripts.d/40-x11-autologin
+++ b/features.in/x11-autologin/rootfs/image-scripts.d/40-x11-autologin
@@ -11,7 +11,7 @@ USER=altlinux
 add_nopasswdlogin_group()
 {
 	[ -f "/etc/pam.d/$1" ] &&
-	egrep -qs '^auth.+user[[:blank:]]+ingroup[[:blank:]]+nopasswdlogin' "/etc/pam.d/$1" &&
+	grep -E -qs '^auth.+user[[:blank:]]+ingroup[[:blank:]]+nopasswdlogin' "/etc/pam.d/$1" &&
 	groupadd -r nopasswdlogin &&
 	gpasswd -a "$USER" nopasswdlogin
 }
diff --git a/lib/build.mk b/lib/build.mk
index 1ea248b4..0acf4d83 100644
--- a/lib/build.mk
+++ b/lib/build.mk
@@ -115,7 +115,7 @@ build-image: profile/populate
 		fi; \
 		tail -n $(MAX_LINES) "$(BUILDLOG)" \
 		| GREP_COLOR="$(ANSI_FAIL)" \
-		  egrep --color=auto -m "$(MAX_ERRORS)" "$(GOTCHA)"; \
+		  grep -E --color=auto -m "$(MAX_ERRORS)" "$(GOTCHA)"; \
 		df -P $(BUILDDIR) | awk 'END { if ($$4 < $(LOWSPACE)) \
 			{ print "NB: low space on "$$6" ("$$5" used)"}}'; \
 	fi; \
diff --git a/lib/profile.mk b/lib/profile.mk
index 4f984773..84eba2e9 100644
--- a/lib/profile.mk
+++ b/lib/profile.mk
@@ -56,7 +56,7 @@ profile/init: distclean
 			SOURCELIST Dir::Etc::sourcelist/f \
 			SOURCEPARTS Dir::Etc::sourceparts/d`; \
 		find "$$SOURCEPARTS" -mindepth 1 -maxdepth 1 -name '*.list' \
-		| xargs egrep -hv -e '^#|^[[:blank:]]*$$' -- "$$SOURCELIST" \
+		| xargs grep -E -hv -e '^#|^[[:blank:]]*$$' -- "$$SOURCELIST" \
 		| tee $(BUILDDIR)/sources.list; \
 		echo; \
 	} $(LOG); \