BASH 18-12-27

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

SOURCES
• Adv-Bash-Scrip-Guide # apt-get install abs-guide; dpkg -L abs-guide; w3m file:///usr/share/doc/abs-guide/html/index.html
• Tecmint              : tecmint.com/linux-commands-cheat-sheet
• TLPD                 : tldp.org/LDP/Bash-Beginners-Guide/html/index.html
• ComandLineFu         : commandlinefu.com
• Die.net              : die.net
• Pure Bash Bible      : github.com/dylanaraps/pure-bash-bible
• Commandlinefu.com    : commandlinefu.com
• Command-Line-Tools   : tldp.org/LDP/GNU-Linux-Tools-Summary/html/index.html
• CheatSheet           $ curl cheat.sh

$ printenv | awk '/PATH|HOME|USER|SHELL/ {print $0}'
$ cat not_exist.txt 2> /dev/null
$ export PS1='$ '
$ printf "The user %s is %d years old.\n" Max 28
$ set | less
$ shellcheck script.sh

TESTs
$ man test
$ [ StringA = StringB ]; echo $?
$ [ StringA != StringB ]; echo $?
$ [ -z String ]; echo $?
$ [ -n String ]; echo $?
$ [ -f fileName ]; echo $?
$ [ -d directory ]; echo $?
$ [ "$NUM" -eq 10 ]; echo $?
$ [ "$NUM" -neq 10 ]; echo $?
$ [ "$NUM" -gt 10 ]; echo $?
$ [ "$NUM" -ge 10 ]; echo $?
$ [ "$NUM" -lt 10 ]; echo $?
$ [ "$NUM" -le 10 ]; echo $?

BASICS 01
$ mkdir scripts
$ export PATH=$HOME/scripts:$PATH
$ cp ~/.bashrc ~/.bashrc_old
$ echo "export PATH=$HOME/scripts:$PATH" >> ~/.bashrc
$ . ~/.bashrc

BASICS 02  
  1 #!/bin/bash
  2 # wg_info
  3 # Basics 02
  4 #
  5 
  6 set | less
  7 glances
  8 clear; ls $HOME/scripts
  9 exit

BASICS 03
  1 #!/bin/bash
  2 # wg_edit scriptname
  3 # Basics 03
  4 #
  5 
  6 [ -z "$1" ] && exit 1
  7 
  8 vim "$HOME/scripts/$1"
  9 chmod 744 "$HOME/scripts/$1"
 10 exit
 
BASICS 04
  1 #!/bin/bash
  2 # wg_args
  3 # Basics 04
  4 # wg_args.sh set `date`
  5 
  6 [ -z "$1" ] && exit 1
  7 echo "Command   : $0"
  8 echo "Count Args: $#"
  9 COUNTER=1
 10 while [ -n "$1" ]
 11 do
 12    echo "Argument ${COUNTER}: $1"
 13    shift
 14    COUNTER=`expr $COUNTER + 1`
 15 done
 16 exit
 
BASICS 05
  1 #!/bin/bash
  2 # check [cpu] [network] [disk] [partition]
  3 # Wrapper for inxi
  4 #
  5 
  6 clear
  7 
  8 while [ -n "$1" ]
  9 do
 10    case "$1" in
 11       "cpu" )
 12          inxi -f
 13          echo
 14          ;;
 15       "network" )
 16          inxi -i
 17          echo
 18          ;;
 19       "disk" )
 20          inxi -D
 21          echo
 22          ;;
 23       "partition" )
 24          inxi -p
 25          echo
 26          ;;
 27    esac
 28    shift
 29 done
 30 
 31 exit