initial

_resources/main1.sh

@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+
+set -u
+
+KEYWORD="${1:-}"
+KEYWORD_LOWER="${KEYWORD,,}"
+
+if [[ -z "$KEYWORD" ]]; then
+    echo "Usage: $0 <keyword>"
+    echo
+    echo "Examples:"
+    echo "  $0 firefox"
+    echo "  $0 chrome"
+    exit 1
+fi
+
+TOTAL_CPU=0
+TOTAL_RAM_KB=0
+TOTAL_SWAP_KB=0
+PROCESS_COUNT=0
+
+# ps aux:
+#
+# USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
+#
+# We skip the header and inspect:
+#
+# $2 = PID
+# $3 = CPU
+# $6 = RSS
+# $11 onward = COMMAND
+#
+# Using "read -ra" would lose command boundaries, so we use awk
+# to print the first 10 fields plus the complete command.
+
+while read -r pid cpu rss command; do
+
+    [[ -n "$pid" ]] || continue
+
+    # Case-insensitive matching against the complete command.
+    if [[ "${command,,}" != *"$KEYWORD_LOWER"* ]]; then
+        continue
+    fi
+
+    PROCESS_COUNT=$((PROCESS_COUNT + 1))
+
+    # CPU percentage from ps.
+    TOTAL_CPU=$(awk \
+        -v a="$TOTAL_CPU" \
+        -v b="$cpu" \
+        'BEGIN { printf "%.2f", a + b }')
+
+    # RSS is in KB.
+    TOTAL_RAM_KB=$((TOTAL_RAM_KB + rss))
+
+    # VmSwap is in kB.
+    if [[ -r "/proc/$pid/status" ]]; then
+        swap=$(awk '
+            /^VmSwap:/ {
+                print $2
+                found=1
+                exit
+            }
+            END {
+                if (!found)
+                    print 0
+            }
+        ' "/proc/$pid/status" 2>/dev/null)
+
+        [[ "$swap" =~ ^[0-9]+$ ]] || swap=0
+
+        TOTAL_SWAP_KB=$((TOTAL_SWAP_KB + swap))
+    fi
+
+done < <(
+    ps aux |
+    tail -n +2 |
+    awk '
+    {
+        pid=$2
+        cpu=$3
+        rss=$6
+
+        command=""
+        for (i=11; i<=NF; i++) {
+            command = command (i==11 ? "" : " ") $i
+        }
+
+        print pid, cpu, rss, command
+    }'
+)
+
+# ------------------------------------------------------------
+# Format KB
+# ------------------------------------------------------------
+
+format_kb() {
+    local kb="$1"
+
+    if (( kb >= 1024 * 1024 )); then
+        awk -v kb="$kb" \
+            'BEGIN { printf "%.2f GB", kb / 1024 / 1024 }'
+
+    elif (( kb >= 1024 )); then
+        awk -v kb="$kb" \
+            'BEGIN { printf "%.0f MB", kb / 1024 }'
+
+    else
+        printf "%d KB" "$kb"
+    fi
+}
+
+echo
+echo "$KEYWORD"
+echo "  Processes : $PROCESS_COUNT"
+printf "  CPU       : %.2f%%\n" "$TOTAL_CPU"
+echo "  RAM       : $(format_kb "$TOTAL_RAM_KB")"
+echo "  Swap      : $(format_kb "$TOTAL_SWAP_KB")"
+echo