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README.md - minor fixes and updates
- signed-off-by: trimstray <trimstray@gmail.com>
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README.md
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README.md
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@ -222,8 +222,8 @@ performance of any of your sites from across the globe.<br>
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##### :black_small_square: Security/hardening
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<p>
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:small_orange_diamond: <a href="https://emeraldonion.org/"><b>Emerald Onion</b></a> - Seattle-based encrypted-transit internet service provider.<br>
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:small_orange_diamond: <a href="https://www.unbound.net/"><b>unbound</b></a> - validating, recursive, and caching DNS resolver (with TLS).<br>
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:small_orange_diamond: <a href="https://emeraldonion.org/"><b>Emerald Onion</b></a> - seattle-based encrypted-transit internet service provider.<br>
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:small_orange_diamond: <a href="https://www.unbound.net/"><b>Unbound</b></a> - validating, recursive, and caching DNS resolver (with TLS).<br>
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</p>
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#### Lists
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@ -277,6 +277,7 @@ performance of any of your sites from across the globe.<br>
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* [du](#tool-du)
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* [inotifywait](#tool-inotifywait)
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* [openssl](#tool-openssl)
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* [secure-delete](#tool-secure-delete)
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- **[HTTP/HTTPS](#http-https)**
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* [curl](#tool-curl)
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* [httpie](#tool-httpie)
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@ -380,6 +381,25 @@ history | cut -c 8-
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fc -l -n 1 | sed 's/^\s*//'
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```
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###### Run command(s) after exit session
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```bash
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cat > /etc/profile << __EOF__
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_after_logout() {
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username=$(whoami)
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for _pid in $(ps afx | grep sshd | grep "$username" | awk '{print $1}') ; do
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kill -9 $_pid
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done
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}
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trap _after_logout EXIT
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__EOF__
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```
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___
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##### Tool: [mount](https://en.wikipedia.org/wiki/Mount_(Unix))
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@ -528,6 +548,14 @@ cd /
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tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ --exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .
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```
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###### System backup with exclude specific directories (pigz)
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```bash
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tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \
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--exclude=proc/* --exclude=sys/* --exclude=dev/* \
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--exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .
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```
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___
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##### Tool: [dump](https://en.wikipedia.org/wiki/Dump_(program))
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@ -591,6 +619,21 @@ tr : '\n' <<<$PATH
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chmod -R -x+X *
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```
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###### Restore permission for /bin/chmod
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```bash
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# 1:
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cp /bin/ls chmod.01
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cp /bin/chmod chmod.01
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./chmod.01 700 file
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# 2:
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/bin/busybox chmod 0700 /bin/chmod
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# 3:
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setfacl --set u::rwx,g::---,o::--- /bin/chmod
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```
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___
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##### Tool: [who](https://en.wikipedia.org/wiki/Who_(Unix))
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@ -621,6 +664,8 @@ ___
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du | sort -r -n | awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | head -n 20
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```
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___
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##### Tool: [inotifywait](https://en.wikipedia.org/wiki/GNU_Screen)
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###### Init tool everytime a file in a directory is modified
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@ -629,6 +674,8 @@ du | sort -r -n | awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} pri
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while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;
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```
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___
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##### Tool: [openssl](https://www.openssl.org/)
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###### Testing connection to remote host
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@ -747,6 +794,40 @@ openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )
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___
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##### Tool: [secure-delete](https://wiki.archlinux.org/index.php/Securely_wipe_disk)
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###### Secure delete with shred
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```bash
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shred -vfuz -n 10 file
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shred --verbose --random-source=/dev/urandom -n 1 /dev/sda
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```
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###### Secure delete with scrub
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```bash
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scrub -p dod /dev/sda
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scrub -p dod -r file
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```
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###### Secure delete with badblocks
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```bash
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badblocks -s -w -t random -v /dev/sda
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badblocks -c 10240 -s -w -t random -v /dev/sda
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```
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###### Secure delete with secure-delete
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```bash
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srm -vz /tmp/file
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sfill -vz /local
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sdmem -v
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swapoff /dev/sda5 && sswap -vz /dev/sda5
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```
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___
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##### Tool: [gnutls-cli](https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html)
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###### Testing connection to remote host (with sni)
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@ -847,6 +928,24 @@ ssh host -l user $(<cmd.txt)
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ssh-keygen -y -f ~/.ssh/id_rsa
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```
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###### Get all fingerprints
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```bash
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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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```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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```bash
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ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host
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```
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___
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##### Tool: [linux-dev](https://www.tldp.org/LDP/abs/html/devref1.html)
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