diff --git a/profile.d/filefct.sh b/profile.d/filefct.sh
index 7358e84..7f666d5 100644
--- a/profile.d/filefct.sh
+++ b/profile.d/filefct.sh
@@ -99,6 +99,7 @@ expandlist()
             continue
         fi
 
+        local content
         for content in "${expanded[@]}"; do
             if (( matched )); then
                 result+="$separator"
@@ -106,6 +107,7 @@ expandlist()
             result+="\"$content\""
             matched=1
         done
+        unset content
     done
 
     shopt -u nullglob
@@ -182,6 +184,7 @@ clean()
     (( ! recursive )) && findopt=(-maxdepth 1)
     (( ! force )) && rmopt=(-i)
 
+    local dir f
     for dir in "${dirlist[@]}"; do
         find "$dir" "${findopt[@]}" -type f \( -name "*~" -o -name "#*#" -o -name "*.bak" -o -name ".~*#" \) -print0 |
             while IFS= read -r -d '' f; do
@@ -191,10 +194,18 @@ clean()
                     else
                         printf 'rm -- "%s"\n' "$f"
                     fi
+                elif (( force )); then
+                    # No confirmation: rm reads no stdin, so leave it attached
+                    # to the find pipe (a /dev/tty redirect would fail when there
+                    # is no controlling terminal, e.g. cron).
+                    rm -- "$f" || disp E "Failed to remove \"$f\"."
                 else
-                    rm "${rmopt[@]}" -- "$f"
+                    # Interactive rm -i: read the answer from the terminal, not
+                    # from the find pipe that feeds this loop's stdin.
+                    rm -i -- "$f" </dev/tty || disp E "Failed to remove \"$f\"."
                 fi
             done
+        unset f
     done
 }
 export -f clean
@@ -214,7 +225,7 @@ mcd()
         return 0
     fi
 
-    if [[ ! $# -eq 1 ]]; then
+    if (( $# != 1 )); then
         disp E "Missing parameter. Use \"mcd --help\" to display usage."
         return 1
     fi
@@ -247,7 +258,7 @@ rmspc()
     local mvopt=()
     local PARSED
 
-    PARSED=$(getopt -o hr:c::vs --long help,recursive,subst-char::,verbose,shell -n 'rmspc' -- "$@")
+    PARSED=$(getopt -o hrc::vs --long help,recursive,subst-char::,verbose,shell -n 'rmspc' -- "$@")
     # shellcheck disable=SC2181 # getopt return code is checked immediately after
     if [[ $? -ne 0 ]]; then
         disp E "Invalid options, use \"rmspc --help\" to display usage."
@@ -302,6 +313,7 @@ rmspc()
     (( verb )) && mvopt=(-v)
 
     shopt -s nullglob
+    local f
     for f in *; do
         if (( recurs )) && [[ -d "$f" ]]; then
             (
@@ -309,11 +321,14 @@ rmspc()
                 (( verb )) && disp I "Entering directory $(pwd)/$f ..."
                 pushd "$f" >/dev/null || return 1
 
-                if (( substchar_set )); then
-                    rmspc ${recurs:+-r} -c "$substchar" ${verb:+-v} ${shell:+-s}
-                else
-                    rmspc ${recurs:+-r} ${verb:+-v} ${shell:+-s}
-                fi
+                # Build the recursive argument list by value: the ${var:+-flag}
+                # idiom would expand on the *string* "0" (non-empty) and wrongly
+                # force -v/-s on every recursive call.
+                local rargs=(-r)
+                (( verb ))  && rargs+=(-v)
+                (( shell )) && rargs+=(-s)
+                (( substchar_set )) && rargs+=(-c "$substchar")
+                rmspc "${rargs[@]}"
 
                 popd >/dev/null || return 1
                 (( verb )) && disp I "Leaving directory $(pwd)/$lastdir"
@@ -337,6 +352,7 @@ rmspc()
             fi
         fi
     done
+    unset f
     shopt -u nullglob
 }
 export -f rmspc
@@ -462,15 +478,19 @@ file_stats()
     fi
 
     # Extension list filter
+    local exts
     if [[ -n "$ext_list" ]]; then
         IFS=',' read -ra exts <<< "$ext_list"
         find_cmd+=('(')
+        local i
         for i in "${!exts[@]}"; do
             [[ $i -ne 0 ]] && find_cmd+=(-o)
             find_cmd+=(-iname "*.${exts[$i]}")
         done
+        unset i
         find_cmd+=(')')
     fi
+    unset exts
 
     # Minimum/maximum size filters (evaluated in bytes)
     if [[ -n "$min_size" || -n "$max_size" ]]; then
@@ -653,22 +673,26 @@ findbig()
         (( one_fs )) && _fd_args+=(--one-file-system)
         _fd_args+=(. "$dir")
         if (( details )); then
+            local line
             "$_fd" "${_fd_args[@]}" --exec stat --printf="%s %n\n" 2>/dev/null \
                 | sort -rn | head -n "$limit" \
                 | while IFS= read -r line; do
                     local path="${line#* }"
                     ls -ld -- "$path"
                 done
+            unset line
         else
             "$_fd" "${_fd_args[@]}" --exec stat --printf="%s %n\n" 2>/dev/null \
                 | sort -rn | head -n "$limit"
         fi
     elif (( details )); then
+        local line
         find "${find_args[@]}" -printf "%s %p\n" 2>/dev/null | sort -rn | head -n "$limit" |
             while IFS= read -r line; do
                 local path="${line#* }"
                 ls -ld -- "$path"
             done
+        unset line
     else
         find "${find_args[@]}" -printf "%s %p\n" 2>/dev/null | sort -rn | head -n "$limit"
     fi
@@ -748,14 +772,18 @@ findzero()
         _fd_args+=(. "$dir")
         if (( delete )); then
             disp W "Deleting empty files in $dir..."
+            local f
             "$_fd" "${_fd_args[@]}" 2>/dev/null | while IFS= read -r f; do
                 printf "%s\n" "$f"
                 rm -f -- "$f"
             done
+            unset f
         elif (( details )); then
+            local f
             "$_fd" "${_fd_args[@]}" 2>/dev/null | while IFS= read -r f; do
                 ls -ls -- "$f"
             done
+            unset f
         else
             "$_fd" "${_fd_args[@]}" 2>/dev/null
         fi
@@ -843,17 +871,23 @@ finddead()
         _fd_args+=(. "$dir")
         if (( delete )); then
             disp W "Deleting dead symlinks in $dir..."
+            local f
             "$_fd" "${_fd_args[@]}" 2>/dev/null | while IFS= read -r f; do
                 [[ -e "$f" ]] || { printf "%s\n" "$f"; rm -f -- "$f"; }
             done
+            unset f
         elif (( details )); then
+            local f
             "$_fd" "${_fd_args[@]}" 2>/dev/null | while IFS= read -r f; do
                 [[ -e "$f" ]] || ls -ls -- "$f"
             done
+            unset f
         else
+            local f
             "$_fd" "${_fd_args[@]}" 2>/dev/null | while IFS= read -r f; do
                 [[ -e "$f" ]] || printf "%s\n" "$f"
             done
+            unset f
         fi
     elif (( delete )); then
         disp W "Deleting dead symlinks in $dir..."