# Shell

## Nohup

To run command silently

    nohup command-with-options &
    
    
## Kill

To kill a program base on its PROCESS_NAME (don't work perfectly and could be dangerous for some PROCESS_NAME)

    ps -ef | grep PROCESS_NAME | grep -v grep | awk '{print $2}' | xargs kill -9
    

## Grep

To search **word1** and exclude a **word2**

    grep "word1" | grep -v "word2"

## Sed

Remove blank lines in a file

    sed '/^$/d' file.input > file.output

## OpenSSL

To generate *.pem* from a RSA key

    openssl rsa -in ~/.ssh/id_rsa -outform pem > id_rsa.pem

To generate *.pem* from a DSA key

    openssl dsa -in ~/.ssh/id_dsa -outform pem > id_dsa.pem