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diff --git a/src/monitor/README.md b/src/monitor/README.md
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+# Resource analysis & monitor
diff --git a/src/monitor/lsof.md b/src/monitor/lsof.md
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+# lsof(8)
+
+```markdown
+lsof
+  -a ......... AND slection filters instead ORing (OR: default)
+  -p <pid> ... filter by <pid>
+  +fg ........ show file flags for file descripros
+  -n ......... don't convert network addr to hostnames
+  -P ......... don't convert network port to service names
+  -i <@h[:p]>. show connections to h (hostname|ip addr) with optional port p
+```
+
+```markdown
+file flags:
+  R/W/RW ..... read/write/read-write
+  CR ......... create
+  AP ......... append
+  TR ......... truncate
+```
+
+# Examples
+
+## File flags
+Show open files with file flags for process:
+```markdown
+lsof +fg -p <pid>
+```
+## Open TCP connections
+Show open tcp connections for `$USER`:
+```markdown
+lsof -a -u $USER -i tcp
+```
+**Note**: `-a` _ands_ the results. If `-a` is not given all open files matching
+`$USER` and all tcp connections are listed (_ored_).
+
+## Open connection to specific host
+Show open connections to `localhost` for `$USER`:
+```markdown
+lsof -a -u $USER -i @localhost
+```
diff --git a/src/monitor/pgrep.md b/src/monitor/pgrep.md
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+# pgrep(1)
+
+```markdown
+pgrep [opts] <pattern>
+  -n         only list newest matching process
+  -u <usr>   only show matching for user <usr>
+  -l         additionally list command
+  -a         additionally list command + arguments
+```
+
+## Debug newest process
+For example attach gdb to newest zsh process from `$USER`.
+```markdown
+gdb -p $(pgrep -n -u $USER zsh)
+```
diff --git a/src/monitor/pidstat.md b/src/monitor/pidstat.md
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+# pidstat(1)
+
+```markdown
+pidstat [opt] [interval] [cont]
+  -U [user]     show username instead UID, optionally only show for user
+  -r            memory statistics
+  -d            I/O statistics
+  -h            single line per process and no lines with average
+```
+
+# Page fault and memory utilization
+```markdown
+pidstat -r -p <pid> [interval] [count]
+```
+
+```markdown
+minor_pagefault: Happens when the page needed is already in memory but not
+                 allocated to the faulting process, in that case the kernel
+                 only has to create a new page-table entry pointing to the
+                 shared physical page (not required to load a memory page from
+                 disk).
+
+major_pagefault: Happens when the page needed is NOT in memory, the kernel
+                 has to create a new page-table entry and populate the
+                 physical page (required to load a memory page from disk).
+```
+
+# I/O statistics
+```markdown
+pidstat -d -p <pid> [interval] [count]
+```
diff --git a/src/monitor/pmap.md b/src/monitor/pmap.md
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+# pmap(1)
+
+```markdown
+pmap <pid>
+    Dump virtual memory map of process.
+    Compared to /proc/<pid>/maps it shows the size of the mappings.
+```
diff --git a/src/monitor/pstack.md b/src/monitor/pstack.md
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+# pstack(1)
+
+```markdown
+pstack <pid>
+    Dump stack for all threads of process.
+```