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<!DOCTYPE html>
<html dir="ltr" lang="en">
    <head>
        <meta charset='utf-8'>
        <title>2.5.2. Bash</title>
    </head>
    <body>
        <a href="index.html">Core OS Index</a>

        <h1 id="bash">2.5.2. Bash</h1>

        <p>Just to be sure, setup bash as default login;<p>

        <pre>
        $ chsh
        </pre>

        <p>Description of configuration files;</p>

        <dl>
            <dt>~/.bash_profile</dt>
            <dd>Minimal file that just load .profile and then .bashrc,
            in this order.</dd>

            <dt>~/.profile<dt>
            <dd>Not specifically related to bash, such as
            environment variables (PATH). Only for login shells (sh)
            or graphical applications.</dd>

            <dt>~/.bashrc</dt>
            <dd>Related to interactive command line, such as bash
            alias, editor.</dd>
        </dl>

        <h2 id="profile">2.5.2.1. Profile</h2>

        <p>Example of ~/.profile;</p>

        <pre>
	export GPG_AGENT_INFO  # the env file does not contain the export statement
	export SSH_AUTH_SOCK   # enable gpg-agent for ssh

	export GPGKEY=XXXXXXXX

	# ssh-agent to ask only ounce for password
	SSH_ENV="$HOME/.ssh/environment"
	function start_agent {
	    echo "Initialising new SSH agent..."
	    /usr/bin/ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}"
	    echo succeeded
	    chmod 600 "${SSH_ENV}"
	    . "${SSH_ENV}" > /dev/null
	    /usr/bin/ssh-add;
	}

	# Source SSH settings, if applicable
	if [ -f "${SSH_ENV}" ]; then
	    . "${SSH_ENV}" > /dev/null
	    #ps ${SSH_AGENT_PID} doesn't work under cywgin
	    ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
		start_agent;
	    }
	else
	    start_agent;
	fi

	# Weston
	if test -z "${XDG_RUNTIME_DIR}"; then
	    export XDG_RUNTIME_DIR=/tmp/${UID}-runtime-dir
	    if ! test -d "${XDG_RUNTIME_DIR}"; then
		mkdir "${XDG_RUNTIME_DIR}"
		chmod 0700 "${XDG_RUNTIME_DIR}"
	    fi
fi        </pre>

        <h2 id="bashrc">2.5.2.2. Bash RC</h2>

        <p>Example of ~/.bashrc;</p>

        <pre>
        # If not running interactively, don't do anything
        case $- in
                *i*) ;;
                *) return;;
        esac


        # check the window size after each command and, if necessary,
        # update the values of LINES and COLUMNS.
        shopt -s checkwinsize


        # don't put duplicate lines or lines starting with space in the history.
        # See bash(1) for more options
        HISTCONTROL=ignoreboth

        # append to the history file, don't overwrite it
        shopt -s histappend

        # for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
        HISTSIZE=1000
        HISTFILESIZE=2000

        alias tmux="tmux -2"

        alias rm='rm -i'
        #alias cp='cp -i'
        alias mv='mv -i'
        # Prevents accidentally clobbering files.
        alias mkdir='mkdir -p'

        alias h='history'
        alias j='jobs -l'
        alias which='type -a'
        alias ..='cd ..'

        # Generate a password
        genpasswd () {
            local l=$1
            [ "$l" == "" ] && l=20
            tr -dc A-Za-z0-9_ &lt; /dev/urandom | head -c ${l} | xargs
        }

        # Git graph log
        glog () {
            git log --graph --abbrev-commit --decorate --date=relative --all
        }

        if [[ -z "$TMUX" ]] ;then
            ID="`tmux ls | grep -vm1 attached | cut -d: -f1`" # get the id of a deattached session
            if [[ -z "$ID" ]] ;then # if not available create a new one
                tmux new-session
            else
                tmux attach-session -t "$ID" # if available attach to it
            fi
        fi
        </pre>

        <h2 id="bash_profile">2.5.2.3. Bash profile</h2>

        <p>Example of ~/.bash_profile;</p>

        <pre>
                #!/bin/bash
                if [ -f ~/.profile ]; then
                   source ~/.profile
                fi

                if [ -f ~/.bashrc ]; then
                   source ~/.bashrc
                fi
        </pre>


        <a href="index.html">Core OS Index</a>
        <p>
        This is part of the Tribu System Documentation.
        Copyright (C) 2020
        Tribu Team.
        See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
        for copying conditions.</p>


    </body>
</html>