BASH #016 ~ dialog

BASH

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Screenshot by Willi Glenz

SUMMARY

001 BASH .............................................................. v1 19-05
011 bash-guide-for-beginners .......................................... v1 19-06
012 advanced-bash-scripting-guide ..................................... v1 19-06
010 aliases ........................................................... v2 19-06
009 job-control ....................................................... v1 19-06
005 environment ....................................................... v1 19-05
002 script-editor ..................................................... v3 19-05
006 tools ............................................................. v1 19-05
007 tests ............................................................. v1 19-05
004 while-loop ........................................................ v1 19-05
013 bash-to-fish|zsh .................................................. v1 19-06
014 one-liner & cowsay ................................................ v1 19-06
015 zsh ............................................................... v1 19-06
016 dialog ............................................................ v1 19-07 new

003 ~/.bashrc ......................................................... v4 19-06
008 ~/.bash_history ................................................... v1 19-06
010 ~/.bash_aliases ................................................... v2 19-06

#016

016 DIALOG

install ................ # apt install dialog
hello world ............ $ dialog --title 'Message' --msgbox 'Hello world!' 5 20
file viewer ............ $ dialog --textbox ~/.bash_aliases 32 80

check-box .............. $ 
$ vim menu.sh
    #!/bin/bash
    # ~/bin/menu.sh
    # first steps
    # version 1
    MENU=`dialog --stdout --no-cancel --clear --menu "Check-Box" 14 20 7 1 one 2 two 3 three 4 four 5 five 6 six q quit`
    echo "Item: : $MENU"
:wq
$ chmod 744 ~/bin/menu.sh

Manpages        $ man dialog
Tutorial        : linuxjournal.com/article/2807

015 ZSH 

$ apt install zsh

OH-MY-ZSH
• github.com/robbyrussell/oh-my-zsh
$ sh -c "$(wget https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"
$ uninstall_oh_my_zsh

• MAN-Pages : $ man zsh
• FAQ       : zsh.sourceforge.net/FAQ/

014 ONE-LINER & COWSAY

INSTALLATION

  $ cp ~/.bashrc ~/.bashrc_old
  $ echo 'clear' >> ~/.bashrc
  $ echo 'echo' >> ~/.bashrc
  $ echo 'neofetch' >> ~/.bashrc
  $ echo 'cowsay -W 80 -f moose $(cat ~/bin/oneliner.txt | shuf -n1)' >> ~/.bashrc
  $ echo 'echo'
  $ . ~/.bashrc

ONE-LINER-TEXTFILE

  $ vim ~/bin/oneliner.txt

  # bash -c "sync; echo 3 > /proc/sys/vm/drop_caches"
  # find / -uid 1000 -exec chown -v 1002:1002 {} \;
  # find / -user userxyz -type f -exec rm -f {} \;
  # find /home -user userxyz -mtime -3
  # find /home -user userxyz -size +1G
  # mkdir -p /mnt/ram; mount -t tmpfs tmpfs /mnt/ram -o size=8192M
  $ alias ea='vim ~/.bash_aliases && source ~/.bash_aliases'
  $ cat /etc/passwd | cut -d: -f7 | sort | uniq -c | sort -nr
  $ cat /etc/shells
  $ curl cheat.sh/:list | less
  $ curl wttr.in
  $ echo "It is now $(date +%T) on $(date +%A)"
  $ find -size +100M | less
  $ find -size +1G | less
  $ find . -name "*.jpg" -exec convert {} -scale 50% +repage {} \;
  $ find /etc -type f -print 2> /dev/null | less
  $ find /etc/*tab -type f -print
  $ find ~ -maxdepth 1 -type f -exec grep "^alias " '{}' \; -print
  $ find ~ -maxdepth 1 -type f -exec grep "^alias " '{}' \; -print
  $ find ~ -maxdepth 1 -type f -mtime 3
  $ mkdir -p Backups/{Sales,Development,HR}/{Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec}/{Sun,Mon,Tue,Wed,Thu,Fri,Sat}
  $ mkdir -p dummy/{1..100}/{1..100}
  $ mount | column -t
  $ mpg123 -zvC /home/user/music/*
  $ ranger ~/.local/share/Trash/
  $ scp -r folder/ [email protected]:~
  $ scp dummy.txt [email protected]:~
  $ sudo -H pip install --upgrade youtube-dl
  $ watch -d -n 5 ls -l
  $ watch free -h
  $ watch mail

  :%sort
  :wq

013 BASH-TO-FISH|ZSH

$ grep -i user /etc/passwd
$ echo $SHELL
$ cat /etc/shells
# apt install fish zsh
$ cat /etc/shells

• Option 1: # vim /etc/passwd               
• Option 2: $ chsh -s /usr/bin/fish         
• Option 3: # usermod -s /bin/bash user     

$ chsh -s /usr/bin/fish
$ chsh -s /bin/fish

$ cat /etc/passwd | cut -d: -f7 | sort | uniq -c | sort -nr

012 ADVANCED-BASH-SCRIPTING-GUIDE

# apt search abs-guide
# apt show abs-guide
# apt install abs-guide
$ dpkg -L abs-guide
> file:///usr/share/doc/abs-guide/html/index.html

tldp.org/LDP/abs/html/

011 BASH-GUIDE-FOR-BEGINNERS

ldp.org/LDP/Bash-Beginners-Guide/html/index.html

010 ALIASES

$ alias
$ ls -l ~/.bash_aliases
$ cp ~/.bash_aliases ~/.bash_aliases_backup
$ alias > ~/.bash_aliases

$ vim ~/.bashrc
    if [ -f ~/.bash_aliases ]; then
        . ~/.bash_aliases
    fi
:wq

$ vim ~/.bash_aliases
   alias a='clear; echo; alias; echo'
   alias c='clear; neofetch; cowsay -W 131 -f moose $(cat ~/bin/oneliner.txt | shuf -n1); echo'
   alias cc='clear; ncal -wy'
   alias ea='vim ~/.bash_aliases && source ~/.bash_aliases'
   alias gl='clear; glances'
   alias gu='clear; guake &' 
   alias h='clear; echo; history 30; echo'
   alias i='intellij-idea-community &'
   alias l='clear; echo; lsd -l; echo'
   alias py='clear; python3'
   alias r='ranger'
   alias s='clear; curl rate.sx/steem@30d'
   alias sc='screen -S firstsession'
   alias ss='clear; curl rate.sx/steem@1d; gnome-screenshot -ac'
   alias ti='clear; tilda&' 
   alias tm='clear; timew month'
   alias tt='clear; task burndown.daily'
   alias ttt='clear; task calendar 2019'
   alias tw='timew'
   alias u='clear; sudo apt update && sudo apt upgrade && sudo apt dist-upgrade; sudo apt autoremove -yy'
   alias yt='sudo -H pip install --upgrade youtube-dl'
:wq

009 JOB-CONTROL

$ vim ~/.vimrc <ctrl+z>
$ vim ~/.bashrc <ctrl+z>
$ ranger <ctrl+z>
$ htop <ctrl+z>
$ glances &
$ jobs
$ fg 1

RUN A BACKGROUNd-JOB
$ sleep 10000 &
$ jobs -l
$ kill 12345

SOURCES
$ help jobs
$ help fg
$ help bg

008 HISTORY 

$ lsd -l | vim - -g ................................... vim

007 TESTS

STRINGS
$ [ StringA = StringB ];    echo $?
$ [ StringA != StringB ];   echo $?
$ [ -z String ];            echo $?
$ [ -n String ];            echo $?

NUMBERS
$ [ "$NUM" -eq 10 ];        echo $?
$ [ "$NUM" -neq 10 ];       echo $?
$ [ "$NUM" -gt 10 ];        echo $?
$ [ "$NUM" -ge 10 ];        echo $?
$ [ "$NUM" -lt 10 ];        echo $?
$ [ "$NUM" -le 10 ];        echo $?

$ [ -f fileName ];          echo $?
$ [ -d directory ];         echo $?

$ man test

006 TOOLS

$ shellcheck ~/bin/script.sh

005 ENVIRONMENT

$ printenv | awk '/PATH|HOME|USER|SHELL/ {print $0}'

004 WHILE-LOOP 

┊ #!/bin/bash
┊ # while-loop 
┊ # ~/bin/wl
┊ # wl set `date`
┊ 
┊ [ -z "$1" ] && exit 1
┊ 
┊ echo "Command   : $0"
┊ echo "Count Args: $#"
┊ 
┊ COUNTER=1
┊ while [ -n "$1" ]
┊ do
┊    echo "Argument ${COUNTER}: $1"
┊    shift
┊    COUNTER=`expr $COUNTER + 1`
┊ done
┊ 
┊ exit

003 BASHRC

$ mkdir ~/bin
$ cp ~/.bashrc ~/.bashrc_old

$ vim ~/.bashrc
  HISTCONTROL=ignoreboth:erasedups
  HISTSIZE=1000
  HISTFILESIZE=1000
  if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
  fi
  set -o vi
  bind -m vi-insert "\C-l":clear-screen
  EDITOR=/usr/bin/vim
  VISUAL=$EDITOR
  export EDITOR VISUAL
  export PATH=$HOME/bin:$PATH
:wq

002 SCRIPT-EDITOR 

┊ #!/bin/bash
┊ # scripteditor
┊ # ~/bin/ed
┊ # ed scriptname.sh
┊ 
┊ [ -z "$1" ] && exit 1
┊ 
┊ DIR=~/bin/
┊ 
┊ vim "$DIR$1"
┊ chmod 744 "$DIR$1"
┊ clear; echo; lsd -l; echo
┊ 
┊ exit

001 BASH

SESSION

$ sudo !!
# apt-get update && apt-get upgrade && apt-get dist-upgrade; apt-get autoremove -yy
# init 0
# init 6
# shutdown -c
# shutdown -h 1:00
# shutdown -r now

SUDO

# visudo 
> Defaults:user timestamp_timeout=30

Homepage        : gnu.org/software/bash/
Documentation   : gnu.org/software/bash/manual/html_node/index.html