diff --git a/README.adoc b/README.adoc
index 65f688d..bbe277e 100644
--- a/README.adoc
+++ b/README.adoc
@@ -8459,7 +8459,7 @@ patch -d gem5/gem5 -p1 < patches/manual/gem5-biglittle.patch
 then:
 
 ....
-./run -a A -g -X-b
+./run -a A -g --gem5-biglittle
 ....
 
 Advantages over `fs.py`:
@@ -9544,8 +9544,6 @@ Otherwise, it becomes very difficult to keep everything working across path refa
 |`-X`   |`EXTRA_OPTS`  |Extra options that did not fit into `A-z`!
                         This string is parsed by `getopt` on a separate parse step with different
                         meanings for each flag.
-|`-X-b` |              |Use `fs_bigLITTLE.py` instead of `fs.py` on gem5 simulation.
-                       Ignored by QEMU.
 |`-x`   |              |Run in graphic mode. Mnemonic: X11.
 |===
 
diff --git a/build b/build
index 69c78d2..9fb5a59 100755
--- a/build
+++ b/build
@@ -18,75 +18,101 @@ kernel_config_fragments=
 post_script_args=
 qemu_sdl='--enable-sdl --with-sdlabi=2.0'
 v=0
-while getopts "B:b:C:c:fGj:hIiK:klp:qSs:v${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    B)
-      echo "$OPTARG" >> "$br2_cli_file"
+parsed=$(getopt \
+  -o "B:b:C:c:fGj:hIiK:klp:qSs:v${common_getopt_flags}" \
+  -l "\
+br-config,\
+br-config-fragment,\
+help,\
+kernel-config,\
+kernel-config-fragment,\
+${common_getopt_flags_long}\
+" \
+-- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    -B|--br-config)
+      echo "$2" >> "$br2_cli_file"
+      shift 2
       ;;
-    b)
-      config_fragments="${config_fragments} $(common_abspath "${OPTARG}")"
+    -b|--br-config-fragment)
+      config_fragments="${config_fragments} $(common_abspath "$2")"
+      shift 2
       ;;
-    C)
-      echo "$OPTARG" >> "$kernel_config_fragment_cli_file_tmp"
+    -C|--kernel-config)
+      echo "$2" >> "$kernel_config_fragment_cli_file_tmp"
+      shift 2
       ;;
-    c)
-      kernel_config_fragments="${kernel_config_fragments} $(common_abspath "${OPTARG}")"
+    -c|--kernel-config-fragment)
+      kernel_config_fragments="${kernel_config_fragments} $(common_abspath "$2")"
+      shift 2
       ;;
-    f)
+    -f)
       configure=false
+      shift
       ;;
-    h)
+    -h)
       echo "https://github.com/cirosantilli/linux-kernel-module-cheat#build" 2>&1
       exit
       ;;
-    I)
+    -I)
       echo "
 BR2_TARGET_ROOTFS_CPIO=n
 BR2_TARGET_ROOTFS_EXT2=n
 BR2_TARGET_ROOTFS_INITRAMFS=y
 " >> "$br2_cli_file"
+      shift
       ;;
-    i)
+    -i)
       echo "
 BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_EXT2=n
 BR2_TARGET_ROOTFS_INITRAMFS=n
 " >> "$br2_cli_file"
+      shift
       ;;
-    j)
-      j="$OPTARG"
+    -j)
+      j="$2"
+      shift 2
       ;;
-    K)
-      linux_kernel_custom_config_file="$(common_abspath "${OPTARG}")"
+    -K)
+      linux_kernel_custom_config_file="$(common_abspath "$2")"
+      shift 2
       ;;
-    k)
+    -k)
       extra_make_args="${extra_make_args} kernel_module-reconfigure \\
 "
+      shift
       ;;
-    l)
+    -l)
       linux_reconfigure=true
       extra_make_args="${extra_make_args} linux-reconfigure \\
 "
+      shift
       ;;
-    p)
-      post_script_args="$OPTARG"
+    -p)
+      post_script_args="$2"
+      shift 2
       ;;
-    q)
+    -q)
       extra_make_args="${extra_make_args} host-qemu-reconfigure \\
 "
+      shift
       ;;
-    S)
+    -S)
       qemu_sdl=
+      shift
       ;;
-    v)
+    -v)
       v=1
+      shift
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift $(($OPTIND - 1))
 if "$common_gem5"; then
   extra_make_args="${extra_make_args} gem5-reconfigure \\
 "
diff --git a/common b/common
index b9dcd05..1abda99 100644
--- a/common
+++ b/common
@@ -26,41 +26,60 @@ common_bench_cmd() (
 
 
 # Handle options common across multiple scripts.
-common_getopts_case() {
+common_getopt_case() {
   case "$1" in
-    a)
-      common_arch="$OPTARG"
+    -a|--arch)
+      common_arch="$2"
+      shift 2
       ;;
-    g)
+    -g|--gem5)
       common_gem5=true
+      shift
       ;;
-    L)
-      common_linux_variant="$OPTARG"
+    -L|--linux-variant)
+      common_linux_variant="$2"
+      shift 2
       ;;
-    M)
-      common_gem5_variant="$OPTARG"
+    -M|--gem5-variant)
+      common_gem5_variant="$2"
+      shift 2
       ;;
-    N)
-      common_gem5_worktree="$OPTARG"
+    -N|--gem5-worktree)
+      common_gem5_worktree="$2"
+      shift 2
       ;;
-    n)
-      common_run_id="$OPTARG"
+    -n|--run-id)
+      common_run_id="$2"
+      shift 2
       ;;
-    Q)
-      common_qemu_variant="$OPTARG"
+    -Q|--qemu-variant)
+      common_qemu_variant="$2"
+      shift 2
       ;;
-    s)
-      common_suffix="$OPTARG"
+    -s|--suffix)
+      common_suffix="$2"
+      shift 2
       ;;
-    t)
-      common_gem5_build_type="$OPTARG"
+    -t|--gem5-build-type)
+      common_gem5_build_type="$2"
+      shift 2
       ;;
-    ?)
+    *)
       exit 2
       ;;
   esac
 }
-common_getopts_flags='a:gL:M:N:n:Q:s:t:'
+common_getopt_flags='a:gL:M:N:n:Q:s:t:'
+common_getopt_flags_long="\
+arch:,\
+gem5,\
+linux-variant:,\
+gem5-variant:,\
+gem5-worktree:,\:
+qemu-variant:,\
+suffix:,\
+gem5-build-type:'
+"
 
 # Setup several variables and do other initialization common to most scripts.
 # Typically done after getting inputs from the command line arguments.
diff --git a/gem5-bench-cache b/gem5-bench-cache
index b9414cd..8129b28 100755
--- a/gem5-bench-cache
+++ b/gem5-bench-cache
@@ -2,17 +2,20 @@
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
 common_gem5=true
 generate_checkpoints=true
-while getopts "C${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    C)
+
+parsed=$(getopt -o "C${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    -C)
       generate_checkpoints=false
+      shift
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 common_setup
 
 # Vars
diff --git a/gem5-shell b/gem5-shell
index 2a94a5d..ba52bdf 100755
--- a/gem5-shell
+++ b/gem5-shell
@@ -1,13 +1,14 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
 common_gem5=true
-while getopts "${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    ?)
-      common_getopts_case "$OPT"
+parsed=$(getopt -o "${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 common_setup
 "${common_gem5_m5term}" localhost "$common_gem5_telnet_port"
diff --git a/gem5-stat b/gem5-stat
index 6ed64f3..8aea64a 100755
--- a/gem5-stat
+++ b/gem5-stat
@@ -1,21 +1,22 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
 common_gem5=true
-while getopts "h${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    h)
+parsed=$(getopt -o "h${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    -h)
       printf "\
 usage: $0 [-a arch] [stat=system.cpu.numCycles]
 Get the value for a gem5 stat from the stats.txt file.
 " 1>&2
       exit
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 if [ $# -gt 0 ]; then
   stat="$1"
 else
diff --git a/getvar b/getvar
index cad9bb5..0ff2e14 100755
--- a/getvar
+++ b/getvar
@@ -1,16 +1,17 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
-while getopts "h${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    h)
+parsed=$(getopt -o "h${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    -h)
       echo "https://github.com/cirosantilli/linux-kernel-module-cheat#getvar" 2>&1
       exit
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 common_setup
 eval "echo \$common_${1}"
diff --git a/qemu-trace2txt b/qemu-trace2txt
index 2a23e8e..61001ba 100755
--- a/qemu-trace2txt
+++ b/qemu-trace2txt
@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
-while getopts "${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    ?)
-      common_getopts_case "$OPT"
+parsed=$(getopt -o "${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
diff --git a/run b/run
index 6bcbd3c..5e55a01 100755
--- a/run
+++ b/run
@@ -15,7 +15,6 @@ extra_append='console_msg_format=syslog nokaslr norandmaps panic=-1 printk.devkm
 extra_append_after_dash=
 extra_flags=
 extra_flags_qemu=
-extra_opts=
 gem5opts=
 gem5_fsbiglittle=false
 gem5_restore_last_checkpoint=
@@ -34,109 +33,136 @@ trace_enabled=false
 # just to prevent QEMU from emitting a warning that '' is not valid.
 trace_type=pr_manager_run
 vnc=
-while getopts "c:DdE:e:F:f:G:hIiKkl:m:PRrT:U:uVX:x${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    c)
-      cpus="$OPTARG"
+
+parsed=$(getopt \
+  -o "c:DdE:e:F:f:G:hIiKkl:m:PRrT:U:uVx${common_getopt_flags}" \
+  -l "\
+append,\
+cpus:,\
+debug,\
+debug-vm,\
+eval:,\
+help:,\
+gem5-biglittle,\
+${common_getopt_flags_long}\
+" \
+-- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    -c|--cpus)
+      cpus="$2"
+      shift 2
       ;;
-    D)
+    -D|--debug-vm)
       debug_vm="gdb -q -ex start --args \\
 "
+      shift
       ;;
-    d)
+    -d|--debug)
       debug=true
       extra_flags_qemu="${extra_flags_qemu} -S \\
 "
+      shift
       ;;
-    E)
-      lkmc_eval="$OPTARG"
+    -E|--eval)
+      lkmc_eval="$2"
+      shift 2
       ;;
-    e)
-      extra_append="${extra_append} ${OPTARG}"
+    -e|--append)
+      extra_append="${extra_append} ${2}"
+      shift 2
       ;;
-    F)
-      extra_append_after_dash="${extra_append_after_dash} lkmc_eval_base64=\"$(printf "${OPTARG}" | base64)\""
-       ;;
-    f)
-      extra_append_after_dash="${extra_append_after_dash} ${OPTARG}"
+    -F)
+      extra_append_after_dash="${extra_append_after_dash} lkmc_eval_base64=\"$(printf "${2}" | base64)\""
+      shift 2
       ;;
-    G)
-      gem5opts="$OPTARG \\
+    -f)
+      extra_append_after_dash="${extra_append_after_dash} ${2}"
+      shift 2
+      ;;
+    -G)
+      gem5opts="$2 \\
 "
+      shift 2
       ;;
-    h)
+    --gem5-biglittle)
+      gem5_fsbiglittle=true
+      ;;
+    -h|--help)
       echo "https://github.com/cirosantilli/linux-kernel-module-cheat#run" 2>&1
       exit
       ;;
-    I)
+    -I)
       initramfs=true
+      shift
       ;;
-    i)
+    -i)
       initrd=true
+      shift
       ;;
-    K)
+    -K)
       kvm=true
+      shift
       ;;
-    k)
+    -k)
       extra_append="$extra_append kgdbwait"
       # For those who want to try KDB.
       #extra_append="$extra_append kgdbwait kgdboc=kbd"
       kgdb=true
+      shift
       ;;
-    l)
-      gem5_restore_last_checkpoint="${OPTARG}"
+    -l)
+      gem5_restore_last_checkpoint="${2}"
+      shift 2
       ;;
-    m)
-      memory="$OPTARG"
+    -m)
+      memory="$2"
+      shift 2
       ;;
-    P)
+    -P)
       prebuilt=true
+      shift
       ;;
-    R)
+    -R)
       rr=replay
+      shift
       ;;
-    r)
+    -r)
       rr=record
+      shift
       ;;
-    T)
+    -T)
       trace_enabled=true
-      trace_type="$OPTARG"
+      trace_type="$2"
+      shift 2
       ;;
-    U)
-      tmux_args="$OPTARG"
+    -U)
+      tmux_args="$2"
+      shift 2
       ;;
-    u)
+    -u)
       tmux=true
+      shift
       ;;
-    X)
-      extra_opts="${extra_opts} ${OPTARG}"
-      ;;
-    x)
+    -x)
       nographic=false
+      shift
       ;;
-    V)
+    -V)
       vnc="-vnc :0 \\
 "
+      shift
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    --)
+      shift
+      break
+      ;;
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
-OPTIND=1
-if [ -n "$extra_opts" ]; then
-  while getopts b OPT $extra_opts; do
-    case "$OPT" in
-      b)
-        gem5_fsbiglittle=true
-        ;;
-      ?)
-        exit 2
-        ;;
-    esac
-  done
-fi
 common_setup
 if "$debug" && "$kvm"; then
   echo 'error: -d and -K are incompatible' 1>&2
diff --git a/rungdb b/rungdb
index 4f36a36..26f6909 100755
--- a/rungdb
+++ b/rungdb
@@ -6,30 +6,44 @@ lx_symbols="-ex 'lx-symbols ../kernel_module-1.0/' \\
 "
 kgdb=false
 docontinue=true
-while getopts "A:a:b:CgkL:n:X${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    A)
-      after="$OPTARG"
+parsed=$(getopt \
+  -o "A:a:b:CgkL:n:X${common_getopt_flags}" \
+  -l "\
+after:,
+before:,
+kgdb:,
+${common_getopt_flags_long}\
+" \
+-- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    -A|--after)
+      after="$2"
+      shift 2
       ;;
-    b)
-      before="$OPTARG"
+    -b|--before)
+      before="$2"
+      shift 2
       ;;
-    C)
+    -C)
       # No Continue.
       docontinue=false
+      shift
       ;;
-    k)
+    -k|--kgdb)
       kgdb=true
+      shift
       ;;
-    X)
+    -X)
       lx_symbols=
+      shift
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 if [ "$#" -gt 0 ]; then
   brk="-ex 'break ${1}' \\
 "
diff --git a/rungdb-user b/rungdb-user
index a4b2371..0a1ddc5 100755
--- a/rungdb-user
+++ b/rungdb-user
@@ -1,18 +1,19 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
 gem5_opt=
-while getopts "h${common_getopts_flags}" OPT; do
-  case "$OPT" in
+parsed=$(getopt -o "h${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
     h)
-      echo "$0 <exec-relative-path> [<brk-symbol>]"
+      echo "$0 <exec-relative-path> [<brk-symbol>]" 2>&1
       exit
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 executable_rel="$1"
 shift
 if [ "$#" -gt 0 ]; then
diff --git a/rungdbserver b/rungdbserver
index 00b5a4f..e09999d 100755
--- a/rungdbserver
+++ b/rungdbserver
@@ -1,13 +1,14 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
-while getopts "${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    ?)
-      common_getopts_case "$OPT"
+parsed=$(getopt -o "${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 executable="$1"
 common_setup
 "${common_host_dir}/usr/bin/${common_arch}-linux-gdb" \
diff --git a/runtc b/runtc
index 43d2781..7dfd2de 100755
--- a/runtc
+++ b/runtc
@@ -1,17 +1,18 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
-while getopts "h${common_getopts_flags}" OPT; do
-  case "$OPT" in
+parsed=$(getopt -o "h${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
     h)
       echo "https://github.com/cirosantilli/linux-kernel-module-cheat#runtc" 2>&1
       exit
       ;;
-    ?)
-      common_getopts_case "$OPT"
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 tool="$1"
 shift
 common_setup
diff --git a/trace-boot b/trace-boot
index e3ae276..3807bdb 100755
--- a/trace-boot
+++ b/trace-boot
@@ -1,13 +1,14 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
-while getopts "${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    ?)
-      common_getopts_case "$OPT"
+parsed=$(getopt -o "${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done
-shift "$(($OPTIND - 1))"
 common_setup
 if "$common_gem5"; then
   time ./run -a "$common_arch" -E 'm5 exit' -g -T 'Exec,-ExecSymbol,-ExecMicro' "$@"
diff --git a/trace2line b/trace2line
index f4b4404..0ad5789 100755
--- a/trace2line
+++ b/trace2line
@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
 . "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common"
-while getopts "${common_getopts_flags}" OPT; do
-  case "$OPT" in
-    ?)
-      common_getopts_case "$OPT"
+parsed=$(getopt -o "${common_getopt_flags}" -l "$common_getopt_flags_long" -- "$@")
+eval set -- "$parsed"
+while true; do
+  case "$1" in
+    *)
+      common_getopt_case "$@"
       ;;
   esac
 done