notes

Trips and tics

• Usefull commands
• Compiled programs
• Usefull installations
• Usefull scripts

Usefull commands

1. Get the lines number of a directory

    find . -name "*.js" -type f -exec cat {} \; | wc -l
   

2. Get the size number of a directory

    find . -name "*.js" -type f -exec cat {} \; | wc -c
   

3. Get current connections info

    ss --options --extended --memory --processes --info
   

4. Show TLS Certificate info

    openssl s_client -state -connect google.com:443
   

5. Connect via HTTPS:

    openssl s_client -state -CAfile startssl.ca.crt -connect igvita.com:443
   

Compiled programs

1. Show binary dependencies

    ldd binary-path
   

Usefull installations

1. Install docker

    sudo curl -sSL https://get.docker.com/ | sh && sudo gpasswd -a ${USER} docker
   

Usefull scripts

1. To change terminal title add the following function to .bashrc:

    st(){
        echo -en "\033]0;$1\a"
    }
   

2. To set the colored promt with current branch name add the following to .bashrc:

    parse_git_branch() {
        local branch=$(git branch 2> /dev/null | \
            sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/')
   
   
        if [[ $branch ]]; then
            local -i MAX_LENGTH=30
            local -i branch_characters=${#branch}
   
            if ((branch_characters > MAX_LENGTH)) ; then
                branch="${branch::30}...)"
            fi
   
            echo "$branch"
        fi
    }
    GREEN="\[\033[0;32m\]"
    NO_COLOR="\[\033[0m\]"
    PS1="$GREEN\$(parse_git_branch)$NO_COLOR${debian_chroot:+($debian_chroot)}\w$ "