QuickBashScriptHack..^^

This repository contains the quick bash help. The snippets of bash scripts/code help to write the script fast. The snippets will further be added by the time, meanwhile if anyone want to contribute, we will be much happy about it. These are those snippets which I mostly use during writing the scripts.

#!/bin/bash

#Define the arguments list in the start of the file
ARGUMENT_LIST=(
	"domain"
	"expiry"
	"dayslimitcri"
	"dayslimitwarn"
	"detail"
)

#Read arguments
opts=$(getopt \
	--longoptions "$(printf "%s:," "${ARGUMENT_LIST[@]}")" \
	--name "$(basename "$0")" \
	--options "" \
	-- "$@"
)


eval set --$opts

while [[ $# -gt 0 ]]; do
	case "$1" in
					
		--domain)
			DOMAIN=$2
			shift 2
			;;

		--expiry)
			EXPIRY=$2
			shift 2
			;;

		--dayslimitcri)
			DAYLIMITCRI=$2
			shift 2
			;;

		--dayslimitwarn)
			DAYLIMITWARN=$2
			shift 2
			;;
			
		--detail)
			DETAIL=$2
			shift 2
			;;
			
		*)
			break
			;;
	esac
done

#Now you can have the values
echo $DOMAIN
echo $EXPIRY
echo $DAYLIMITCRI
echo $DAYLIMITWARN
echo $DETAIL

if [[ "$STR1" == "" ]] || [[ "$STR2" == "" ]] || [[ "$STR2" == "" ]];then
	echo "Arguments are not compelete"
	exit  
fi

if [[ "$STR1" == "" ]] || [[ "$STR2" == "" ]];then

	echo "Arguments are not compelete"
	exit  

else

	if [[ "$STR1" -gt "$STR2" ]]
	then
		echo "String1: " $STR1 " String2: " $STR2
		exit
	elif [[( "$STR1" -gt "$STR2" )]] && [[( "$STR1" -le "$STR2" )]]
	then
		echo "String1: " $STR1 " String2: " $STR2
		exit 1
	elif [[( "$STR1" -le "$STR2" )]]
	then
		echo "String1: " $STR1 " String2: " $STR2
		exit 2

	fi

fi

#Ref: https://unix.stackexchange.com/questions/109625/shell-scripting-z-and-n-options-with-if
[ -z "$output2" ]  #string is null, that is, has zero length
[ -n "$output" ] #string is not null
[[ "$STR1" == "" ]]
[[ "$1" == "userdel" ]]
[[ "$STR1" -gt "$STR2" ]]
[[( "$STR1" -le "$STR2" )]]
[ ! -d "$dir" ] #dir does not exist
[ "$(echo "$dirperm" | cut -c6)" != "-" ] #Command execution in if statemnet
[ id ] && passing=true #if the command run sucessfull then true the passing flag

DAYS_LEFT=`python -c "from datetime import date; print((date($EXPIRY)-date.today()).days)"`
echo $DAYS_LEFT

#Function definition
help_function(){

echo "-----HELP FUNCTION-------"
echo "script.sh [OPTIONS BELOW]"

echo "PARAMETERS"
echo ""
echo "--domain <Domain Name>"
echo "--dayslimitcri <Days Limit for Critical>"
echo "--dayslimitwarn <Days Limit for Warning>"
echo "--detail <Other detail>"
echo ""

echo "Info: At this moment all parameters should be present for execution of script"
echo "-------------------------"
}

#Function call
help_function

while read line; do
  echo "$line"
done <file.txt

for i in element1 element2;
do 

echo $i

done

du -sh * | awk '($1~/[0-9]+\.?[0-9]*G$/)' | cut -f2 | (while read -r dir_files; do
	find ./$dir_files -prune -exec stat --printf='User: %U | Group: %G | Size: ' {} \; -exec du -sh {} \; 
done)   

find . -xdev -type f -size +1M -exec stat --printf='User: %U | Group: %G | Size: ' {} \; -exec du -sh {} \;

#Define/Declare below function in /etc/bashrc 
#~ confirm anycommand
#Ref: https://askubuntu.com/questions/22233/always-prompt-the-user-before-executing-a-command-in-the-shell
#We can show the message on the binaries in this way
confirm() {
    echo -n "Do you want to run $*? [N/y] "
    read -N 1 REPLY
    echo
    if test "$REPLY" = "y" -o "$REPLY" = "Y"; then
		"$@"
	else
        echo "Cancelled by user"
    fi
}

#Define/Declare below function in /etc/bashrc 
#~ confirm userdel user_name
#We can show the message on the binaries in this way
confirm() {
    echo -n "Do you want to run $*? [N/y] "
    read -N 1 REPLY
    echo
    if test "$REPLY" = "y" -o "$REPLY" = "Y"; then
        if [[ "$1" == "userdel" ]]; then
          echo "Contact to Admin"
        fi
    else
        echo "Cancelled by user"
    fi
}