diff --git a/INSTALL/Ventoy2Disk.sh b/INSTALL/Ventoy2Disk.sh
index dac5c2f5..f08ab109 100644
--- a/INSTALL/Ventoy2Disk.sh
+++ b/INSTALL/Ventoy2Disk.sh
@@ -12,11 +12,11 @@ if [ -f ./ventoy/version ]; then
     curver=$(cat ./ventoy/version) 
 fi
 
-if uname -m | egrep -q 'aarch64|arm64'; then
+if uname -m | grep -E -q 'aarch64|arm64'; then
     export TOOLDIR=aarch64
-elif uname -m | egrep -q 'x86_64|amd64'; then
+elif uname -m | grep -E -q 'x86_64|amd64'; then
     export TOOLDIR=x86_64
-elif uname -m | egrep -q 'mips64'; then
+elif uname -m | grep -E -q 'mips64'; then
     export TOOLDIR=mips64el
 else
     export TOOLDIR=i386
diff --git a/INSTALL/VentoyPlugson.sh b/INSTALL/VentoyPlugson.sh
index 5394a36f..0f2d0b39 100644
--- a/INSTALL/VentoyPlugson.sh
+++ b/INSTALL/VentoyPlugson.sh
@@ -30,13 +30,13 @@ fi
 OLDDIR=$(pwd)
 
 machine=$(uname -m)
-if echo $machine | egrep -q 'aarch64|arm64'; then
+if echo $machine | grep -E -q 'aarch64|arm64'; then
     TOOLDIR=aarch64
-elif echo $machine | egrep -q 'x86_64|amd64'; then
+elif echo $machine | grep -E -q 'x86_64|amd64'; then
     TOOLDIR=x86_64
-elif echo $machine | egrep -q 'mips64'; then
+elif echo $machine | grep -E -q 'mips64'; then
     TOOLDIR=mips64el
-elif echo $machine | egrep -q 'i[3-6]86'; then
+elif echo $machine | grep -E -q 'i[3-6]86'; then
     TOOLDIR=i386
 else
     echo "Unsupported machine type $machine"    
@@ -122,7 +122,7 @@ if echo $DISK | grep -q "[a-z]d[a-z][1-9]"; then
     DISK=${DISK:0:-1}
 fi
 
-if echo $DISK | egrep -q "/dev/nvme|/dev/mmcblk/dev/nbd"; then
+if echo $DISK | grep -E -q "/dev/nvme|/dev/mmcblk/dev/nbd"; then
     if echo $DISK | grep -q "p[1-9]$"; then
         DISK=${DISK:0:-2}
     fi
diff --git a/INSTALL/VentoyWeb.sh b/INSTALL/VentoyWeb.sh
index f06ae066..537348aa 100644
--- a/INSTALL/VentoyWeb.sh
+++ b/INSTALL/VentoyWeb.sh
@@ -23,11 +23,11 @@ fi
 
 OLDDIR=$(pwd)
 
-if uname -m | egrep -q 'aarch64|arm64'; then
+if uname -m | grep -E -q 'aarch64|arm64'; then
     TOOLDIR=aarch64
-elif uname -m | egrep -q 'x86_64|amd64'; then
+elif uname -m | grep -E -q 'x86_64|amd64'; then
     TOOLDIR=x86_64
-elif uname -m | egrep -q 'mips64'; then
+elif uname -m | grep -E -q 'mips64'; then
     TOOLDIR=mips64el
 else
     TOOLDIR=i386
diff --git a/INSTALL/tool/VentoyWorker.sh b/INSTALL/tool/VentoyWorker.sh
index c148f8c8..2d18b607 100644
--- a/INSTALL/tool/VentoyWorker.sh
+++ b/INSTALL/tool/VentoyWorker.sh
@@ -434,7 +434,7 @@ elif [ "$MODE" = "install" -a -n "$NONDESTRUCTIVE" ]; then
             PART1_BLKID=$(blkid $PART1)
             blkid $PART1
             
-            if echo $PART1_BLKID | egrep -q -i 'TYPE=ntfs|TYPE=.ntfs'; then
+            if echo $PART1_BLKID | grep -E -q -i 'TYPE=ntfs|TYPE=.ntfs'; then
                 echo "Partition 1 contains NTFS filesystem"
                 
                 which ntfsresize
@@ -452,7 +452,7 @@ elif [ "$MODE" = "install" -a -n "$NONDESTRUCTIVE" ]; then
                     echo "###[FAIL] ntfsresize failed." 
                     exit 1
                 fi
-            elif echo $PART1_BLKID | egrep -q -i 'TYPE=ext[2-4]|TYPE=.ext[2-4]'; then
+            elif echo $PART1_BLKID | grep -E -q -i 'TYPE=ext[2-4]|TYPE=.ext[2-4]'; then
                 echo "Partition 1 contains EXT filesystem"
                 
                 which resize2fs
diff --git a/Vlnk/VentoyVlnk.sh b/Vlnk/VentoyVlnk.sh
index e242d071..c0b83a76 100644
--- a/Vlnk/VentoyVlnk.sh
+++ b/Vlnk/VentoyVlnk.sh
@@ -19,7 +19,7 @@ vlog() {
 }
 
 vlnk_suffix() {
-    echo $1 | egrep -q '.*(.vlnk.iso|.vlnk.img|.vlnk.wim|.vlnk.vhd|.vlnk.vhdx|.vlnk.efi|.vlnk.vtoy|.vlnk.dat)$'
+    echo $1 | grep -E -q '.*(.vlnk.iso|.vlnk.img|.vlnk.wim|.vlnk.vhd|.vlnk.vhdx|.vlnk.efi|.vlnk.vtoy|.vlnk.dat)$'
 }
 
 
@@ -38,13 +38,13 @@ for t in 'mountpoint' 'readlink' 'xzcat'; do
 done
 
 machine=$(uname -m)
-if echo $machine | egrep -q 'aarch64|arm64'; then
+if echo $machine | grep -E -q 'aarch64|arm64'; then
     TOOLDIR=aarch64
-elif echo $machine | egrep -q 'x86_64|amd64'; then
+elif echo $machine | grep -E -q 'x86_64|amd64'; then
     TOOLDIR=x86_64
-elif echo $machine | egrep -q 'mips64'; then
+elif echo $machine | grep -E -q 'mips64'; then
     TOOLDIR=mips64el
-elif echo $machine | egrep -q 'i[3-6]86'; then
+elif echo $machine | grep -E -q 'i[3-6]86'; then
     TOOLDIR=i386
 else
     echo "Unsupported machine type $machine"    
@@ -103,7 +103,7 @@ if [ "$CMD" = "c" ]; then
         exit 1
     fi
     
-    if echo $IMG | egrep -q -i '.*(.iso|.img|.wim|.vhd|.vhdx|.efi|.vtoy|.dat)$'; then
+    if echo $IMG | grep -E -q -i '.*(.iso|.img|.wim|.vhd|.vhdx|.efi|.vtoy|.dat)$'; then
         :
     else
         echo "This file is not supported for vlnk!"
@@ -157,7 +157,7 @@ if [ "$CMD" = "c" ]; then
         FS=$(grep " ${FULLDIR} " /proc/mounts | awk '{print $3}')
         vlog "File system of $DEV is $FS"
         
-        if echo $FS | egrep -q "ext2|ext3|ext4|exfat|vfat|fat32|fat16|fat12|ntfs|xfs|udf"; then
+        if echo $FS | grep -E -q "ext2|ext3|ext4|exfat|vfat|fat32|fat16|fat12|ntfs|xfs|udf"; then
             vlog "FS OK"
         elif [ "$FS" = "fuseblk" ]; then
             vlog "$DEV is fuseblk"
@@ -203,7 +203,7 @@ if [ "$CMD" = "c" ]; then
     
     if [ -f "/sys/class/block/$IMGPARTITION/start" ]; then
         PARTSTART=$(cat "/sys/class/block/$IMGPARTITION/start")
-        if echo $IMGPARTITION | egrep -q 'mmc|nbd|nvme'; then
+        if echo $IMGPARTITION | grep -E -q 'mmc|nbd|nvme'; then
             DISK=$(echo /dev/$IMGPARTITION | sed "s/^\(.*\)p[0-9][0-9]*$/\1/")
         else
             DISK=$(echo /dev/$IMGPARTITION | sed "s/^\(.*[^0-9]\)[0-9][0-9]*$/\1/")