fix: use command tr so a user alias cannot hijack shipped pipelines

lib/atlas-bridge.zsh

@@ -850,7 +850,7 @@ _flow_where_fallback() {
   done
 
   if [[ -n "$status_dir" ]]; then
-    local proj_status=$(_flow_status_field "$status_dir" "Status" | tr -d ' ')
+    local proj_status=$(_flow_status_field "$status_dir" "Status" | command tr -d ' ')
     local focus=$(_flow_status_field "$status_dir" "Focus")
 
     [[ -n "$proj_status" ]] && echo "   Status: $proj_status"

lib/backup-helpers.zsh

@@ -344,7 +344,7 @@ _teach_count_backups() {
         return 0
     fi
 
-    find "$backup_dir" -maxdepth 1 -type d -name "*.20*" 2>/dev/null | wc -l | tr -d ' '
+    find "$backup_dir" -maxdepth 1 -type d -name "*.20*" 2>/dev/null | wc -l | command tr -d ' '
 }
 
 # =============================================================================
@@ -603,7 +603,7 @@ _teach_confirm_delete() {
     fi
 
     # Count files
-    local file_count=$(find "$backup_path" -type f 2>/dev/null | wc -l | tr -d ' ')
+    local file_count=$(find "$backup_path" -type f 2>/dev/null | wc -l | command tr -d ' ')
     echo "  Files:    $file_count"
 
     echo ""
@@ -669,7 +669,7 @@ _teach_preview_cleanup() {
     echo ""
 
     local backups=$(_teach_list_backups "$content_path")
-    local backup_count=$(echo "$backups" | wc -l | tr -d ' ')
+    local backup_count=$(echo "$backups" | wc -l | command tr -d ' ')
 
     if [[ "$backup_count" -eq 0 ]]; then
         echo "  ${FLOW_COLORS[dim]}No backups to clean${FLOW_COLORS[reset]}"

lib/cache-analysis.zsh

@@ -40,7 +40,7 @@ _analyze_cache_size() {
     fi
 
     # Count files
-    local file_count=$(find "$cache_dir" -type f 2>/dev/null | wc -l | tr -d ' ')
+    local file_count=$(find "$cache_dir" -type f 2>/dev/null | wc -l | command tr -d ' ')
 
     # Get size in bytes (portable: use du -sk for KB, then convert)
     local size_kb=0
@@ -109,7 +109,7 @@ _analyze_cache_by_directory() {
         local dir_size_human=$(_cache_format_bytes "$dir_size_bytes")
 
         # Count files
-        local dir_files=$(find "$subdir" -type f 2>/dev/null | wc -l | tr -d ' ')
+        local dir_files=$(find "$subdir" -type f 2>/dev/null | wc -l | command tr -d ' ')
 
         # Calculate percentage
         local percentage=0

lib/cache-helpers.zsh

@@ -53,7 +53,7 @@ _cache_status() {
     fi
 
     # Count files
-    local file_count=$(find "$freeze_dir" -type f 2>/dev/null | wc -l | tr -d ' ')
+    local file_count=$(find "$freeze_dir" -type f 2>/dev/null | wc -l | command tr -d ' ')
 
     # Get size
     local size_bytes=0
@@ -587,7 +587,7 @@ _cache_analyze() {
             while IFS= read -r subdir; do
                 local subdir_name=$(basename "$subdir")
                 local subdir_size=$(du -sh "$subdir" 2>/dev/null | awk '{print $1}')
-                local subdir_files=$(find "$subdir" -type f 2>/dev/null | wc -l | tr -d ' ')
+                local subdir_files=$(find "$subdir" -type f 2>/dev/null | wc -l | command tr -d ' ')
 
                 printf "${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}   %-30s %8s  (%s files)\n" \
                     "$subdir_name" "$subdir_size" "$subdir_files"
@@ -705,7 +705,7 @@ _cache_clean() {
         dirs_to_delete+=("_site")
         if command -v du &>/dev/null; then
             local site_size=$(du -sh "$site_dir" 2>/dev/null | awk '{print $1}')
-            local site_files=$(find "$site_dir" -type f 2>/dev/null | wc -l | tr -d ' ')
+            local site_files=$(find "$site_dir" -type f 2>/dev/null | wc -l | command tr -d ' ')
             total_files=$((total_files + site_files))
         fi
     fi

lib/concept-extraction.zsh

@@ -42,7 +42,7 @@ _extract_concepts_from_frontmatter() {
         concepts_json=$(echo "$frontmatter" | yq eval -o json '.concepts // ""' - 2>/dev/null)
         # Return empty if concepts is null, empty string, empty array, or array with only empty strings
         local trimmed
-        trimmed=$(echo "$concepts_json" | tr -d '\n' | xargs)
+        trimmed=$(echo "$concepts_json" | command tr -d '\n' | xargs)
         # Check if trimmed result is empty, "[]", or "[""]"
         if [[ -z "$trimmed" || "$trimmed" == "[]" || "$trimmed" == "[\"\"]" ]]; then
             echo -n ""
@@ -74,12 +74,12 @@ _parse_introduced_concepts() {
     if [[ "$concepts_json" =~ '^\[.*\]$' ]]; then
         # Array of objects format: extract .id from each object
         local introduced
-        introduced=$(echo "$concepts_json" | yq eval -o json '.[] | .id' - 2>/dev/null | sed 's/"//g' | tr '\n' ' ' | xargs)
+        introduced=$(echo "$concepts_json" | yq eval -o json '.[] | .id' - 2>/dev/null | sed 's/"//g' | command tr '\n' ' ' | xargs)
         echo "$introduced"
     else
         # Simple format: extract .introduces array
         local introduced
-        introduced=$(echo "$concepts_json" | yq eval -o json '.introduces // [] | .[]' - 2>/dev/null | sed 's/"//g' | tr '\n' ' ' | xargs)
+        introduced=$(echo "$concepts_json" | yq eval -o json '.introduces // [] | .[]' - 2>/dev/null | sed 's/"//g' | command tr '\n' ' ' | xargs)
         echo "$introduced"
     fi
 }
@@ -102,12 +102,12 @@ _parse_required_concepts() {
     if [[ "$concepts_json" =~ '^\[.*\]$' ]]; then
         # Array of objects format: extract all .prerequisites arrays and flatten
         local required
-        required=$(echo "$concepts_json" | yq eval -o json '.[] | .prerequisites // [] | .[]' - 2>/dev/null | sed 's/"//g' | sort -u | tr '\n' ' ' | xargs)
+        required=$(echo "$concepts_json" | yq eval -o json '.[] | .prerequisites // [] | .[]' - 2>/dev/null | sed 's/"//g' | sort -u | command tr '\n' ' ' | xargs)
         echo "$required"
     else
         # Simple format: extract .requires array
         local required
-        required=$(echo "$concepts_json" | yq eval -o json '.requires // [] | .[]' - 2>/dev/null | sed 's/"//g' | tr '\n' ' ' | xargs)
+        required=$(echo "$concepts_json" | yq eval -o json '.requires // [] | .[]' - 2>/dev/null | sed 's/"//g' | command tr '\n' ' ' | xargs)
         echo "$required"
     fi
 }
@@ -231,7 +231,7 @@ _extract_concepts_from_frontmatter() {
         return 0
     fi
     concepts_json=$(echo "$frontmatter" | yq eval -o json '.concepts // ""' - 2>/dev/null)
-    trimmed=$(echo "$concepts_json" | tr -d '\n' | xargs)
+    trimmed=$(echo "$concepts_json" | command tr -d '\n' | xargs)
     if [[ -z "$trimmed" || "$trimmed" == "[]" || "$trimmed" == "[\"\"]" ]]; then
         echo -n ""
     else
@@ -248,9 +248,9 @@ _parse_introduced_concepts() {
     fi
     # Check if array format: [{id: "...", ...}]
     if [[ "$concepts_json" =~ '^\[.*\]$' ]]; then
-        introduced=$(echo "$concepts_json" | yq eval -o json '.[] | .id' - 2>/dev/null | sed 's/"//g' | tr '\n' ' ' | xargs)
+        introduced=$(echo "$concepts_json" | yq eval -o json '.[] | .id' - 2>/dev/null | sed 's/"//g' | command tr '\n' ' ' | xargs)
     else
-        introduced=$(echo "$concepts_json" | yq eval -o json '.introduces // [] | .[]' - 2>/dev/null | sed 's/"//g' | tr '\n' ' ' | xargs)
+        introduced=$(echo "$concepts_json" | yq eval -o json '.introduces // [] | .[]' - 2>/dev/null | sed 's/"//g' | command tr '\n' ' ' | xargs)
     fi
     echo "$introduced"
 }
@@ -264,9 +264,9 @@ _parse_required_concepts() {
     fi
     # Check if array format: [{prerequisites: [...], ...}]
     if [[ "$concepts_json" =~ '^\[.*\]$' ]]; then
-        required=$(echo "$concepts_json" | yq eval -o json '.[] | .prerequisites // [] | .[]' - 2>/dev/null | sed 's/"//g' | sort -u | tr '\n' ' ' | xargs)
+        required=$(echo "$concepts_json" | yq eval -o json '.[] | .prerequisites // [] | .[]' - 2>/dev/null | sed 's/"//g' | sort -u | command tr '\n' ' ' | xargs)
     else
-        required=$(echo "$concepts_json" | yq eval -o json '.requires // [] | .[]' - 2>/dev/null | sed 's/"//g' | tr '\n' ' ' | xargs)
+        required=$(echo "$concepts_json" | yq eval -o json '.requires // [] | .[]' - 2>/dev/null | sed 's/"//g' | command tr '\n' ' ' | xargs)
     fi
     echo "$required"
 }

lib/core.zsh

@@ -869,7 +869,7 @@ _flow_tty_handoff_cleanup() {
 #
 # Example:
 #   _flow_status_field "$project_path" "Focus"
-#   _flow_status_field "$project_path" "Progress" | tr -d '%'   # site strips %
+#   _flow_status_field "$project_path" "Progress" | command tr -d '%'   # site strips %
 #
 # Notes:
 #   - Handles both the "## Field:" markdown dialect and the plain "field:"

lib/date-parser.zsh

@@ -84,7 +84,7 @@ _date_parse_quarto_yaml() {
 
   # Extract date value from YAML frontmatter
   local date_value
-  date_value=$(yq eval ".${field} // \"\"" "$file" 2>/dev/null | tr -d '"')
+  date_value=$(yq eval ".${field} // \"\"" "$file" 2>/dev/null | command tr -d '"')
 
   # Return empty if not found or null
   if [[ -z "$date_value" || "$date_value" == "null" ]]; then
@@ -601,7 +601,7 @@ _date_load_config() {
 
       if [[ -n "$exam_date" && "$exam_date" != "null" ]]; then
         # Normalize exam name to key (lowercase, spaces to underscores)
-        local exam_key=$(echo "$exam_name" | tr '[:upper:]' '[:lower:]' | tr ' ' '_')
+        local exam_key=$(echo "$exam_name" | command tr '[:upper:]' '[:lower:]' | command tr ' ' '_')
         printf 'CONFIG_DATES[exam_%s]="%s"\n' "$exam_key" "$exam_date"
       fi
     done
@@ -650,7 +650,7 @@ _date_load_config() {
       holiday_date=$(yq eval ".semester_info.holidays[$i].date" "$config_file" 2>/dev/null)
 
       if [[ -n "$holiday_date" && "$holiday_date" != "null" ]]; then
-        local holiday_key=$(echo "$holiday_name" | tr '[:upper:]' '[:lower:]' | tr ' ' '_')
+        local holiday_key=$(echo "$holiday_name" | command tr '[:upper:]' '[:lower:]' | command tr ' ' '_')
         printf 'CONFIG_DATES[holiday_%s]="%s"\n' "$holiday_key" "$holiday_date"
       fi
     done

lib/deploy-rollback-helpers.zsh

@@ -201,7 +201,7 @@ _deploy_perform_rollback() {
     # Record rollback in deploy history
     if typeset -f _deploy_history_append >/dev/null 2>&1; then
         local file_count=0
-        file_count=$(git diff --name-only "${full_hash}^" "$full_hash" 2>/dev/null | wc -l | tr -d ' ')
+        file_count=$(git diff --name-only "${full_hash}^" "$full_hash" 2>/dev/null | wc -l | command tr -d ' ')
         _deploy_history_append \
             "rollback" \
             "$commit_after" \

lib/dispatchers/dot-doctor-integration.zsh

@@ -36,7 +36,7 @@ _dots_doctor_integration() {
       # Check for uncommitted changes
       local status_output=$(chezmoi status 2>/dev/null)
       if [[ -n "$status_output" ]]; then
-        local count=$(echo "$status_output" | wc -l | tr -d ' ')
+        local count=$(echo "$status_output" | wc -l | command tr -d ' ')
         _flow_log_warning "$count uncommitted changes"
       else
         _flow_log_success "No uncommitted changes"

lib/dispatchers/dots-dispatcher.zsh

@@ -300,8 +300,8 @@ _dots_size() {
   echo "${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}                                                   ${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}"
 
   # Check for nested .git directories
-  local git_count=$(find "$chezmoi_dir" -name ".git" -type d -not -path "$chezmoi_dir/.git" 2>/dev/null | wc -l | tr -d ' ')
-  local git_dotf_count=$(find "$chezmoi_dir" -name "dot_git" -type d 2>/dev/null | wc -l | tr -d ' ')
+  local git_count=$(find "$chezmoi_dir" -name ".git" -type d -not -path "$chezmoi_dir/.git" 2>/dev/null | wc -l | command tr -d ' ')
+  local git_dotf_count=$(find "$chezmoi_dir" -name "dot_git" -type d 2>/dev/null | wc -l | command tr -d ' ')
   local total_git_dirs=$((git_count + git_dotf_count))
 
   if (( total_git_dirs > 0 )); then
@@ -311,7 +311,7 @@ _dots_size() {
   fi
 
   # Check for large files (>100KB)
-  local large_count=$(find "$chezmoi_dir" -type f -not -path "$chezmoi_dir/.git/*" -size +100k 2>/dev/null | wc -l | tr -d ' ')
+  local large_count=$(find "$chezmoi_dir" -type f -not -path "$chezmoi_dir/.git/*" -size +100k 2>/dev/null | wc -l | command tr -d ' ')
   if (( large_count > 0 )); then
     echo "${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}  ${FLOW_COLORS[warning]}⚠️  Found $large_count files larger than 100KB${FLOW_COLORS[reset]}          ${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}"
     echo "${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}  ${FLOW_COLORS[muted]}Review with: dots size | grep '⚠️'${FLOW_COLORS[reset]}            ${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}"
@@ -648,7 +648,7 @@ _dots_show_file_diff() {
   echo ""
   echo "${FLOW_COLORS[header]}─────────────────────────────────────────────────${FLOW_COLORS[reset]}"
   chezmoi diff "$file" 2>/dev/null | head -20
-  local line_count=$(chezmoi diff "$file" 2>/dev/null | wc -l | tr -d ' ')
+  local line_count=$(chezmoi diff "$file" 2>/dev/null | wc -l | command tr -d ' ')
   if [[ $line_count -gt 20 ]]; then
     echo "${FLOW_COLORS[muted]}... (${line_count} lines total, showing first 20)${FLOW_COLORS[reset]}"
   fi
@@ -1268,7 +1268,7 @@ _dots_doctor_check_chezmoi_health() {
   fi
 
   # 5. Check managed file count
-  local managed_count=$(chezmoi managed 2>/dev/null | wc -l | tr -d ' ')
+  local managed_count=$(chezmoi managed 2>/dev/null | wc -l | command tr -d ' ')
   if (( managed_count > 0 )); then
     echo "${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}  ${FLOW_COLORS[success]}✓${FLOW_COLORS[reset]} $managed_count files managed                          ${FLOW_COLORS[header]}│${FLOW_COLORS[reset]}"
   else
@@ -1295,7 +1295,7 @@ _dots_doctor_check_chezmoi_health() {
   local large_files=$(find "$chezmoi_dir" -type f -not -path "$chezmoi_dir/.git/*" -size +100k 2>/dev/null)
   local large_count=0
   if [[ -n "$large_files" ]]; then
-    large_count=$(echo "$large_files" | wc -l | tr -d ' ')
+    large_count=$(echo "$large_files" | wc -l | command tr -d ' ')
   fi
 
   if (( large_count > 0 )); then
@@ -1323,10 +1323,10 @@ _dots_doctor_check_chezmoi_health() {
   local git_count=0
   local git_dotf_count=0
   if [[ -n "$git_dirs" ]]; then
-    git_count=$(echo "$git_dirs" | wc -l | tr -d ' ')
+    git_count=$(echo "$git_dirs" | wc -l | command tr -d ' ')
   fi
   if [[ -n "$git_dotf_dirs" ]]; then
-    git_dotf_count=$(echo "$git_dotf_dirs" | wc -l | tr -d ' ')
+    git_dotf_count=$(echo "$git_dotf_dirs" | wc -l | command tr -d ' ')
   fi
   local total_git=$((git_count + git_dotf_count))
 
@@ -1573,7 +1573,7 @@ fi
 
   for name in "${selected_secrets[@]}"; do
     # Convert to SCREAMING_SNAKE_CASE
-    local env_name=$(echo "${name}" | tr '[:lower:]-' '[:upper:]_')
+    local env_name=$(echo "${name}" | command tr '[:lower:]-' '[:upper:]_')
     envrc_content+="export ${env_name}=\$(sec get ${name})
 "
   done
@@ -1600,7 +1600,7 @@ fi
   echo ""
   echo "Environment variables:"
   for name in "${selected_secrets[@]}"; do
-    local env_name=$(echo "${name}" | tr '[:lower:]-' '[:upper:]_')
+    local env_name=$(echo "${name}" | command tr '[:lower:]-' '[:upper:]_')
     echo "  ${FLOW_COLORS[accent]}\$${env_name}${FLOW_COLORS[reset]}"
   done
   echo ""

lib/dispatchers/email-dispatcher.zsh

@@ -632,7 +632,7 @@ _em_safety_gate() {
     body_text=$(echo "$draft_content" | awk '/^$/{found=1;next} found{print}')
 
     # Check for empty body
-    if [[ -z "$body_text" || "$(echo "$body_text" | tr -d '[:space:]')" == "" ]]; then
+    if [[ -z "$body_text" || "$(echo "$body_text" | command tr -d '[:space:]')" == "" ]]; then
         _flow_log_warning "Empty email body"
     fi
 
@@ -646,7 +646,7 @@ _em_safety_gate() {
     if [[ -n "$body_text" ]]; then
         echo "$body_text" | head -15
         local total_lines
-        total_lines=$(echo "$body_text" | wc -l | tr -d ' ')
+        total_lines=$(echo "$body_text" | wc -l | command tr -d ' ')
         (( total_lines > 15 )) && echo -e "  ${_C_DIM}... ($((total_lines - 15)) more lines)${_C_NC}"
     fi
     echo -e "${_C_DIM}$(printf '%.0s─' {1..60})${_C_NC}"

lib/dispatchers/sec-dispatcher.zsh

@@ -299,7 +299,7 @@ _sec_status() {
       echo ""
       echo "${FLOW_COLORS[info]}Keychain:${FLOW_COLORS[reset]}"
       echo "  • Status: ${FLOW_COLORS[success]}active${FLOW_COLORS[reset]}"
-      echo "  • Location: $(security list-keychains 2>/dev/null | head -1 | tr -d ' \"')"
+      echo "  • Location: $(security list-keychains 2>/dev/null | head -1 | command tr -d ' \"')"
 
       # Count secrets
       local secret_count=$(_sec_count_keychain 2>/dev/null || echo "0")
@@ -329,7 +329,7 @@ _sec_status() {
       echo ""
       echo "${FLOW_COLORS[info]}Keychain:${FLOW_COLORS[reset]}"
       echo "  • Status: ${FLOW_COLORS[success]}active${FLOW_COLORS[reset]} (primary)"
-      echo "  • Location: $(security list-keychains 2>/dev/null | head -1 | tr -d ' \"')"
+      echo "  • Location: $(security list-keychains 2>/dev/null | head -1 | command tr -d ' \"')"
       local kc_count=$(_sec_count_keychain 2>/dev/null || echo "0")
       echo "  • Secrets: $kc_count"
       echo ""
@@ -1465,7 +1465,7 @@ _sec_sync_github() {
   echo "Will sync ${#selected_secrets[@]} secret(s) to ${repo_name}:"
   for name in "${selected_secrets[@]}"; do
     # Convert to SCREAMING_SNAKE_CASE for GitHub
-    local gh_name=$(echo "${name}" | tr '[:lower:]-' '[:upper:]_')
+    local gh_name=$(echo "${name}" | command tr '[:lower:]-' '[:upper:]_')
     echo "  ${FLOW_COLORS[muted]}${name}${FLOW_COLORS[reset]} → ${FLOW_COLORS[accent]}${gh_name}${FLOW_COLORS[reset]}"
   done
   echo ""
@@ -1494,7 +1494,7 @@ _sec_sync_github() {
     fi
 
     # Convert to SCREAMING_SNAKE_CASE
-    local gh_name=$(echo "${name}" | tr '[:lower:]-' '[:upper:]_')
+    local gh_name=$(echo "${name}" | command tr '[:lower:]-' '[:upper:]_')
 
     # Set GitHub secret
     if echo "$secret_value" | gh secret set "$gh_name" --repo "$repo_name" 2>/dev/null; then

lib/dispatchers/teach-dates.zsh

@@ -194,7 +194,7 @@ _teach_dates_sync() {
 
     local file_num=1
     for file in "${(@k)file_mismatches}"; do
-        local count=$(echo "${file_mismatches[$file]}" | wc -w | tr -d ' ')
+        local count=$(echo "${file_mismatches[$file]}" | wc -w | command tr -d ' ')
         printf "  %d. %s (%d mismatch)\n" "$file_num" "$file" "$count"
         ((file_num++))
     done

lib/dispatchers/teach-deploy-enhanced.zsh

@@ -421,7 +421,7 @@ _deploy_dry_run_report() {
     # here. Say so, otherwise the count silently understates what would ship.
     if ! _git_is_clean 2>/dev/null; then
         local _uncommitted
-        _uncommitted=$(git status --porcelain 2>/dev/null | wc -l | tr -d ' ')
+        _uncommitted=$(git status --porcelain 2>/dev/null | wc -l | command tr -d ' ')
         echo ""
         echo "${FLOW_COLORS[warn]}  Note:${FLOW_COLORS[reset]} $_uncommitted uncommitted file(s) are NOT included below."
         echo "${FLOW_COLORS[dim]}        A real deploy would offer to commit them first.${FLOW_COLORS[reset]}"
@@ -432,7 +432,7 @@ _deploy_dry_run_report() {
     files_changed=$(git diff --name-status "$prod_branch"..."$draft_branch" 2>/dev/null)
 
     if [[ -n "$files_changed" ]]; then
-        local file_count=$(echo "$files_changed" | wc -l | tr -d ' ')
+        local file_count=$(echo "$files_changed" | wc -l | command tr -d ' ')
         echo ""
         echo "  Would deploy $file_count files:"
 
@@ -1035,7 +1035,7 @@ _teach_deploy_enhanced() {
         if typeset -f _deploy_history_append >/dev/null 2>&1; then
             local _commit_after="${DEPLOY_COMMIT_AFTER:-$(git rev-parse --short=8 HEAD 2>/dev/null)}"
             local _commit_before="${DEPLOY_COMMIT_BEFORE:-}"
-            local _file_count="${DEPLOY_FILE_COUNT:-$(git diff --name-only HEAD~1 HEAD 2>/dev/null | wc -l | tr -d ' ')}"
+            local _file_count="${DEPLOY_FILE_COUNT:-$(git diff --name-only HEAD~1 HEAD 2>/dev/null | wc -l | command tr -d ' ')}"
             local _elapsed="${DEPLOY_DURATION:-0}"
             _deploy_history_append "direct" "$_commit_after" "$_commit_before" "$draft_branch" "$prod_branch" "$_file_count" "$smart_message" "null" "null" "$_elapsed"
             echo "  ${FLOW_COLORS[dim]}History logged: #$(( $(_deploy_history_count) )) ($(date '+%Y-%m-%d %H:%M'))${FLOW_COLORS[reset]}"
@@ -1182,7 +1182,7 @@ _teach_deploy_enhanced() {
         local modified=$(echo "$files_changed" | grep -c "^M" || echo 0)
         local added=$(echo "$files_changed" | grep -c "^A" || echo 0)
         local deleted=$(echo "$files_changed" | grep -c "^D" || echo 0)
-        local total=$(echo "$files_changed" | wc -l | tr -d ' ')
+        local total=$(echo "$files_changed" | wc -l | command tr -d ' ')
 
         echo ""
         echo "${FLOW_COLORS[dim]}Summary: $total files ($added added, $modified modified, $deleted deleted)${FLOW_COLORS[reset]}"