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added 'vmstat/iostat' one-liners
- signed-off-by: trimstray <trimstray@gmail.com>
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README.md
79
README.md
@ -1091,6 +1091,8 @@ Linux Security Expert</b></a> - trainings, howtos, checklists, security tools an
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* [lsof](#tool-lsof)
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* [ps](#tool-ps)
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* [top](#tool-top)
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* [vmstat](#tool-vmstat)
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* [iostat](#tool-iostat)
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* [strace](#tool-strace)
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* [kill](#tool-kill)
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* [find](#tool-find)
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@ -1550,6 +1552,77 @@ top -p $(pgrep -d , <str>)
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___
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##### Tool: [vmstat](https://en.wikipedia.org/wiki/Vmstat)
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###### Show current system utilization (fields in kilobytes)
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```bash
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vmstat 2 20 -t -w
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```
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* `2` - number of times with a defined time interval (delay)
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* `20` - each execution of the command (count)
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* `-t` - show timestamp
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* `-w` - wide output
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* `-S M` - output of the fields in megabytes instead of kilobytes
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###### Show current system utilization will get refreshed every 5 seconds
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```bash
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vmstat 5 -w
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```
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###### Display report a summary of disk operations
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```bash
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vmstat -D
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```
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###### Display report of event counters and memory stats
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```bash
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vmstat -s
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```
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###### Display report about kernel objects stored in slab layer cache
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```bash
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vmstat -m
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```
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##### Tool: [iostat](https://en.wikipedia.org/wiki/Iostat)
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###### Show information about the CPU usage, and I/O statistics about all the partitions
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```bash
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iostat 2 10 -t -m
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```
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* `2` - number of times with a defined time interval (delay)
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* `10` - each execution of the command (count)
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* `-t` - show timestamp
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* `-m` - fields in megabytes (`-k` - in kilobytes, default)
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###### Show information only about the CPU utilization
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```bash
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iostat 2 10 -t -m -c
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```
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###### Show information only about the disk utilization
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```bash
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iostat 2 10 -t -m -d
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```
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###### Show information only about the LVM utilization
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```bash
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iostat -N
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```
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___
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##### Tool: [strace](https://en.wikipedia.org/wiki/Strace)
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###### Track with child processes
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@ -2293,7 +2366,7 @@ ssh user@host cat /path/to/remotefile | diff /path/to/localfile -
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ssh -t reachable_host ssh unreachable_host
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```
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###### Run command over ssh on remote host
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###### Run command over SSH on remote host
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```bash
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cat > cmd.txt << __EOF__
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@ -2315,13 +2388,13 @@ ssh-keygen -y -f ~/.ssh/id_rsa
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ssh-keygen -l -f .ssh/known_hosts
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```
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###### Ssh authentication with user password
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###### SSH authentication with user password
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```bash
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ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@remote_host
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```
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###### Ssh authentication with publickey
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###### SSH authentication with publickey
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```bash
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ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host
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