added pgrep

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diff --git a/src/pgrep.md b/src/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)
+```