diff --git a/TARGETS.sh b/TARGETS.sh
index de64f97..21881ef 100644
--- a/TARGETS.sh
+++ b/TARGETS.sh
@@ -25,5 +25,5 @@ gdb:.config/gdb
 sandbox:
 utils:.local/bin/myip .local/bin/genpass .local/bin/gensalt .local/bin/django-create-project .local/bin/mirror-site .local/bin/split-file .local/bin/extract .local/bin/destroy
 chromium:.local/bin/pchromium .local/share/applications/pchromium.desktop
-scripts:.local/bin/httpstatus .local/bin/bb .local/bin/emoji .local/bin/mksh .local/bin/nato .local/bin/pastas .local/bin/timer .local/bin/tryna .local/bin/trynafail
+scripts:.local/bin/httpstatus .local/bin/bb .local/bin/emoji .local/bin/mksh .local/bin/nato .local/bin/pastas .local/bin/timer .local/bin/tryna .local/bin/trynafail .local/bin/bak .local/bin/cleanup-directory .local/bin/cleanup-directory-log .local/bin/cleanup-downloads .local/bin/gobuild .local/bin/json .local/bin/mcd .local/bin/open .local/bin/py .local/bin/sha .local/bin/showtips .local/bin/weather
 all:%less %t %note %tmux %zsh %nvim %git"
diff --git a/home/user/.config/zsh/functions b/home/user/.config/zsh/functions
index 3f81c33..7d817a4 100644
--- a/home/user/.config/zsh/functions
+++ b/home/user/.config/zsh/functions
@@ -1,13 +1,5 @@
 # vim: ft=zsh
 
-py() {
-    if [[ -z "$@" && -x "$(command -v ipython 2>/dev/null)" ]]; then
-        ipython -i -c "q = exit"
-    else
-        python3 "$@"
-    fi
-}
-
 ve() {
     local -r venv_name="${1:-venv}"
     python3 -m venv "${venv_name}" && . "${venv_name}/bin/activate"
@@ -41,146 +33,6 @@ va() {
     fi
 }
 
-mcd() {
-    local dir
-
-    if [ -z "${1}" ]; then
-        dir="$(mktemp -ut "${USER:-user}.XXXX")"
-    else
-        dir="${1}"
-    fi
-
-    mkdir -p "${dir}" && cd "${dir}"
-}
-
-open() {
-    if [ ! -e "${1}" ]; then
-        printf 'File %s not found' "${1}" >&2
-        exit 1
-    fi
-    nohup xdg-open "${1}" 1>/dev/null 2>&1 &
-}
-
-json() {
-    if [ -t 0 ]; then
-       python -m json.tool <<< "$*"
-    else  # pipe
-       python -m json.tool
-    fi
-}
-
-showtips() {
-    local -r tips_dir="${HOME}/.tips"
-
-    if [ ! -d "${tips_dir}" ]; then
-        mkdir "${tips_dir}" 2>/dev/null
-        git init "${tips_dir}"
-    fi
-
-    set -o nullglob
-    local filename
-    for filename in "${tips_dir}"/*
-    do
-        cat "${filename}"
-    done
-    return 0
-}
-
-cleanup-directory() {
-    local -r directory="$(realpath "${1}")"
-    local -r age="+21" # Notation: +n  => "At least n days"
-
-    if [ ! -d "${directory}" ]; then
-        echo "Directory '${directory}' not found" >&2
-        return 1
-    fi
-
-    if [ -n "${DRYRUN}" ]; then
-        echo "Deleting files not accessed for a ${age} days:"
-        find "${directory}" -mindepth 1 -atime "${age}" -not -type d -not -name cleanup.log
-
-        echo "Deleting empty directories:"
-        find "${directory}" -mindepth 1 -type d -empty
-    else
-        echo "Deleting files not accessed for a ${age} days:"
-        find "${directory}" -mindepth 1 -atime "${age}" -not -type d -not -name cleanup.log -print -delete
-
-        echo "Deleting empty directories:"
-        find "${directory}" -mindepth 1 -type d -empty -print -delete
-    fi
-}
-
-cleanup-directory-log() {
-    local -r directory="$(realpath "${1}")"
-    if [ ! -d "${directory}" ]; then
-        echo "Directory '${directory}' not found" >&2
-        return 1
-    fi
-
-    local log_file="${directory}/cleanup.log"
-
-    if [ -n "${DRYRUN}" ]; then
-        log_file="/dev/null"
-    fi
-
-    touch "${log_file}"
-
-    echo "$(date -Iseconds) : Start cleanup" >> "${log_file}"
-    cleanup-directory "${directory}"  | tee -a "${log_file}"
-}
-
-cleanup-downloads() {
-    local -r downloads_directory="${XDG_DOWNLOAD_DIR}"
-    cleanup-directory-log "${downloads_directory}"
-}
-
-_bak() {
-    local -r filename="${1}"
-    mv "${filename}" "${filename}.bak"
-}
-
-_unbak() {
-    local -r filename="${1}"
-    local -r new_filename="${filename/%.bak/}"
-
-    if [[ -e "${new_filename}" ]]; then
-        echo "Filename '${new_filename}' already exists" >&2
-        return 1
-    fi
-
-    mv "${filename}" "${new_filename}"
-}
-
-bak() {
-    local filename
-    for filename in "$@"; do
-        if [[ "${filename: -4}" = ".bak" ]]; then
-            _unbak "${filename}"
-        else
-            _bak "${filename}"
-        fi
-    done
-}
-
-sha() {
-    if [ -v 2 ]; then
-        shasum -a 256 "${@}"
-    elif [ -v 1 ]; then
-        shasum -a 256 "${@}" | head -c 64
-    else
-        shasum -a 256 | head -c 64
-    fi
-}
-
-weather() {
-    local -r city="${1}"
-    curl "wttr.in/${city}" 2>/dev/null | head -n -1
-}
-
-gobuild() {
-    go build $@ -o ./bin/ ./...
-}
-
 top-commands() {
     local -r num_args="${1:-1}"
 
diff --git a/home/user/.local/bin/bak b/home/user/.local/bin/bak
new file mode 100755
index 0000000..eb7b30f
--- /dev/null
+++ b/home/user/.local/bin/bak
@@ -0,0 +1,34 @@
+#!/bin/sh
+set -eu
+
+ends_with_bak() {
+    case "${1}" in
+        *.bak) return 0 ;;
+        *)     return 1 ;;
+    esac
+}
+
+_bak() {
+    filename="${1}"
+    mv "${filename}" "${filename}.bak"
+}
+
+_unbak() {
+    filename="${1}"
+    new_filename="$(echo "${filename}" | sed 's/\.bak$//')"
+
+    if [ -e "${new_filename}" ]; then
+        echo "Filename '${new_filename}' already exists" >&2
+        return 1
+    fi
+
+    mv "${filename}" "${new_filename}"
+}
+
+for filename in "${@}"; do
+    if ends_with_bak "${filename}"; then
+        _unbak "${filename}"
+    else
+        _bak "${filename}"
+    fi
+done
diff --git a/home/user/.local/bin/cleanup-directory b/home/user/.local/bin/cleanup-directory
new file mode 100755
index 0000000..eb63fe3
--- /dev/null
+++ b/home/user/.local/bin/cleanup-directory
@@ -0,0 +1,26 @@
+#!/bin/sh
+set -eu
+
+
+directory="$(realpath "${1}")"
+readonly directory
+readonly age="+21" # Notation: +n  => "At least n days"
+
+if [ ! -d "${directory}" ]; then
+    echo "Directory '${directory}' not found" >&2
+    return 1
+fi
+
+if [ -n "${DRYRUN}" ]; then
+    echo "Deleting files not accessed for a ${age} days:"
+    find "${directory}" -mindepth 1 -atime "${age}" -not -type d -not -name cleanup.log
+
+    echo "Deleting empty directories:"
+    find "${directory}" -mindepth 1 -type d -empty
+else
+    echo "Deleting files not accessed for a ${age} days:"
+    find "${directory}" -mindepth 1 -atime "${age}" -not -type d -not -name cleanup.log -print -delete
+
+    echo "Deleting empty directories:"
+    find "${directory}" -mindepth 1 -type d -empty -print -delete
+fi
diff --git a/home/user/.local/bin/cleanup-directory-log b/home/user/.local/bin/cleanup-directory-log
new file mode 100755
index 0000000..f5d74c5
--- /dev/null
+++ b/home/user/.local/bin/cleanup-directory-log
@@ -0,0 +1,22 @@
+#!/bin/sh
+set -eu
+
+
+directory="$(realpath "${1}")"
+readonly directory
+
+if [ ! -d "${directory}" ]; then
+    echo "Directory '${directory}' not found" >&2
+    return 1
+fi
+
+readonly log_file="${directory}/cleanup.log"
+
+if [ -n "${DRYRUN}" ]; then
+    log_file="/dev/null"
+fi
+
+touch "${log_file}"
+
+echo "$(date -Iseconds) : Start cleanup" >> "${log_file}"
+cleanup-directory "${directory}"  | tee -a "${log_file}"
diff --git a/home/user/.local/bin/cleanup-downloads b/home/user/.local/bin/cleanup-downloads
new file mode 100755
index 0000000..c8a922b
--- /dev/null
+++ b/home/user/.local/bin/cleanup-downloads
@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+readonly downloads_directory="${XDG_DOWNLOAD_DIR}"
+cleanup-directory-log "${downloads_directory}"
diff --git a/home/user/.local/bin/gobuild b/home/user/.local/bin/gobuild
new file mode 100755
index 0000000..f11b236
--- /dev/null
+++ b/home/user/.local/bin/gobuild
@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+#shellcheck disable=SC2068
+go build $@ -o ./bin/ ./...
diff --git a/home/user/.local/bin/json b/home/user/.local/bin/json
new file mode 100755
index 0000000..17d414e
--- /dev/null
+++ b/home/user/.local/bin/json
@@ -0,0 +1,8 @@
+#!/bin/sh
+set -eu
+
+if [ -t 0 ]; then
+   echo "${@}" | python -m json.tool
+else
+   python -m json.tool
+fi
diff --git a/home/user/.local/bin/mcd b/home/user/.local/bin/mcd
new file mode 100755
index 0000000..9c075de
--- /dev/null
+++ b/home/user/.local/bin/mcd
@@ -0,0 +1,10 @@
+#!/bin/sh
+set -eu
+
+if [ -z "${1}" ]; then
+    dir="$(mktemp -ut "${USER:-user}.XXXX")"
+else
+    dir="${1}"
+fi
+
+mkdir -p "${dir}" && cd "${dir}"
diff --git a/home/user/.local/bin/open b/home/user/.local/bin/open
new file mode 100755
index 0000000..1d7426d
--- /dev/null
+++ b/home/user/.local/bin/open
@@ -0,0 +1,9 @@
+#!/bin/sh
+set -eu
+
+
+if [ ! -e "${1}" ]; then
+    printf 'File %s not found' "${1}" >&2
+    exit 1
+fi
+setsid xdg-open "${1}" 1>/dev/null 2>&1
diff --git a/home/user/.local/bin/py b/home/user/.local/bin/py
new file mode 100755
index 0000000..e224e7e
--- /dev/null
+++ b/home/user/.local/bin/py
@@ -0,0 +1,9 @@
+#!/bin/sh
+set -eu
+
+
+if [ -z "${*}" ] && [ -x "$(command -v ipython 2>/dev/null)" ]; then
+    ipython -i -c "q = exit"
+else
+    python3 "${@}"
+fi
diff --git a/home/user/.local/bin/sha b/home/user/.local/bin/sha
new file mode 100755
index 0000000..00139a6
--- /dev/null
+++ b/home/user/.local/bin/sha
@@ -0,0 +1,11 @@
+#!/bin/sh
+set -eu
+
+
+if [ -n "${2+x}" ]; then
+    shasum -a 256 "${@}"
+elif [ -n "${1+x}" ]; then
+    shasum -a 256 "${@}" | head -c 64
+else
+    shasum -a 256 | head -c 64
+fi
diff --git a/home/user/.local/bin/showtips b/home/user/.local/bin/showtips
new file mode 100755
index 0000000..5eb95d0
--- /dev/null
+++ b/home/user/.local/bin/showtips
@@ -0,0 +1,12 @@
+#!/bin/sh
+set -eu
+
+
+readonly tips_dir="${HOME}/.tips"
+
+if [ ! -d "${tips_dir}" ]; then
+    mkdir "${tips_dir}" 2>/dev/null
+    git init "${tips_dir}"
+fi
+
+find "${tips_dir}" -mindepth 1 -maxdepth 1 -type f -exec cat {} \;
diff --git a/home/user/.local/bin/weather b/home/user/.local/bin/weather
new file mode 100755
index 0000000..f3db7e0
--- /dev/null
+++ b/home/user/.local/bin/weather
@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+readonly city="${1}"
+curl "wttr.in/${city}" 2>/dev/null | head -n -1