diff --git a/build/jam/BeOSRules b/build/jam/BeOSRules
index a7cc7c8ead..bc54496a17 100644
--- a/build/jam/BeOSRules
+++ b/build/jam/BeOSRules
@@ -266,7 +266,7 @@ actions ResComp1
 {
 	export $(HOST_ADD_BUILD_COMPATIBILITY_LIB_DIR)
 	cat "$(2[2-])" | $(CC) $(CCFLAGS) -E $(CCDEFS) $(HDRS) - \
-		| egrep -v '^#' | $(2[1]) $(RCHDRS) --auto-names -o "$(1)" -
+		| grep -E -v '^#' | $(2[1]) $(RCHDRS) --auto-names -o "$(1)" -
 }
 
 rule ResAttr attributeFile : _resourceFiles : deleteAttributeFile
diff --git a/build/scripts/build_haiku_image b/build/scripts/build_haiku_image
index 7c3b13fb4c..1089d64491 100755
--- a/build/scripts/build_haiku_image
+++ b/build/scripts/build_haiku_image
@@ -374,7 +374,7 @@ fi
 
 # install default settings for packages
 for packageFile in $systemPackages; do
-	if $package list -p $packageFile | egrep '^settings/' > /dev/null; then
+	if $package list -p $packageFile | grep -E '^settings/' > /dev/null; then
 		extractFile $packageFile system/settings settings
 	fi
 done
diff --git a/src/bin/leak_analyser.sh b/src/bin/leak_analyser.sh
index 2532e2af52..af4ad13b84 100755
--- a/src/bin/leak_analyser.sh
+++ b/src/bin/leak_analyser.sh
@@ -132,7 +132,7 @@ do
 done
 
 
-ALLOCATIONS=$(cat "$FILENAME" | egrep "^allocation: |^	" | tr '\n' '^' \
+ALLOCATIONS=$(cat "$FILENAME" | grep -E "^allocation: |^	" | tr '\n' '^' \
 	| sed 's/\^a/~a/g' | tr '~' '\n' | sed 's/$/^/' | c++filt)
 
 if [ ! -z "$EXCLUDE_PATTERN" ]
diff --git a/src/bin/unzip/zipgrep b/src/bin/unzip/zipgrep
index 71c3a2e7d6..649964bcb7 100644
--- a/src/bin/unzip/zipgrep
+++ b/src/bin/unzip/zipgrep
@@ -41,14 +41,14 @@ res=0
 for i in `unzip -Z1 "$zipfile" ${1+"$@"}`; do
   if test $list -eq 1; then
 
-    unzip -p-L "$zipfile" "$i" | egrep $opt "$pat" > /dev/null && echo $i
+    unzip -p-L "$zipfile" "$i" | grep -E $opt "$pat" > /dev/null && echo $i
     r=$?
   elif test $silent -eq 1; then
 
-    unzip -p-L "$zipfile" "$i" | egrep $opt "$pat"
+    unzip -p-L "$zipfile" "$i" | grep -E $opt "$pat"
     r=$?
   else
-    unzip -p-L "$zipfile" "$i" | egrep $opt "$pat" | sed "s|^|${i}:|"
+    unzip -p-L "$zipfile" "$i" | grep -E $opt "$pat" | sed "s|^|${i}:|"
     r=$?
   fi
   test "$r" -ne 0 && res="$r"
diff --git a/src/tests/qemu-boot-test b/src/tests/qemu-boot-test
index 203c7aa057..d0e0d7f4d6 100755
--- a/src/tests/qemu-boot-test
+++ b/src/tests/qemu-boot-test
@@ -38,7 +38,7 @@ function check_logs {
 		echo "NO"
 	fi
 	echo "    Potential issues in logs:"
-	egrep -i "FATAL|ERROR|FAIL|GDB" $FILE | grep -vi " No error"
+	grep -E -i "FATAL|ERROR|FAIL|GDB" $FILE | grep -vi " No error"
 }
 
 case "$PLATFORM" in