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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
```
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