HowTo Unix Tools

find and grep

Linux:

$ find / -name jre 2>&1 | grep -v "Permission denied"

$ find / -name jre 2>/dev/null

Solaris:

$ find ./ -type f -exec grep "foo" {} +

$ find ./ -name "name of file" -type f -exec grep "sign of parameter" {} + | grep -v "ignore me"

openssl

Export cert from keystore

$ openssl pkcs12 -in keystore.p12 -out cert.pem -nodes

Show cert details

$ openssl x509 -in cert.pem -text -noout

Export public key from cert

$ openssl x509 -pubkey -noout -in cert.crt > pubkey.pem

Export private key from keystore in pem format

$ openssl pkcs12 -in keystore.p12 -nocerts -nodes -out key.pem

Convert key from pem to der format 

$ openssl rsa -pubin -inform PEM -in pubkey.pem -outform DER -out pubkey.der

$ openssl rsa -pubin -inform PEM -in key.pem -outform DER -out key.der

Decrypt private key

$ openssl rsa -in key.pem -out private.key

Calculate Shake256 hash

$ cat public.key | openssl shake256

nc

listen tcp port:

$ nc -lv <port>

telnet

connect to tcp port:

$ telnet <ip> <port>

finish connect:

Ctrl + ] - go to cmd

telnet> close - close the connection

touch

$ touch -a -m -t 202108180130.09 <file name>

networking

show
$ netstat -rn

show default gw

$ ip route

delete
$ sudo route delete default gw 192.168.88.1 eth1

curl

send post request

$ curl -H "Content-Type: application/json" --data @body.json http://localhost:8080/ui/webapp/conf

send GET request

$ curl http://localhost:8080/ui/webapp/conf

tar

Extract

$ tar -xvzf image.tar.gz

Create

$ tar -czvf image.tar.gz /path/to/dir

Show content

$ tar -ztvf image.tar.gz

dd

Add padding to file

$ dd if=/dev/zero bs=1 count=8 >> public.pad.key

sed

Replace A to B in file

$ cat input.file | sed 's/A/B/g' > output.file

keytool

Show contains

$ keytool -list -v -keystore keystore.jks

Convert keystore in JCEKS format to P12

$ keytool -importkeystore -srckeystore keystore.jks -destkeystore keystore.p12 -srcstoretype jceks -alias mycert

Import key/cert into jceks keystore from other

$ keytool -importkeystore -srckeystore source.jks -destkeystore keystore.jceks -srcstoretype jceks -alias mycert

Change password for key in keystore:

$ keytool -keypasswd -alias mycert -keystore keystore.jks

Delete alias from keystore:

$ keytool -delete -alias mycert -keystore keystore.jks