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Commit 9949851

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‎Bash-Arithmetic.sh

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# Author : Jaydatt Patel
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# arithmetic : +,-,*,/,%
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#syntax : $((arithmetic))
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echo $((5+2))
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echo $((5-2))
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echo $((5*2))
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echo $((5/2))
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echo $((5%2))
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a=7
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b=3
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echo $((a+b))
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‎Bash-Array.sh

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# Author : Jaydatt Patel
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# Method-1 : declare -a Array_name
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# Method-2 : arr=()
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# Method-3 : array_name=(1 2 "three" $num.......)
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# echo ${arr[pos]} for selected elements
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# echo ${arr[@]} for all elements
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# arr=() Create an empty array
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# arr=(1 2 3) Initialize array
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# ${arr[2]} Retrieve third element
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# ${arr[@]} Retrieve all elements
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# ${!arr[@]} Retrieve array indices
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# ${#arr[@]} Calculate array size
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# arr[0]=3 Overwrite 1st element
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# arr+=(4) Append value(s)
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# str=$(ls) Save ls output as a string
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# arr=( $(ls) ) Save ls output as an array of files
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# ${arr[@]:s:n} Retrieve n elements starting at index s
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# Method-1
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declare -a emptyArr #create empty array
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echo ${emptyArr[@]}
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# Method-2
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empArr=()
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# Method-3
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num=5
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arr=(1 2 "three" "four" $num)
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arr+=("six")
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arr+=(7)
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echo Array Size : ${#arr[@]}
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echo ${arr[0]}
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echo ${arr[2]}
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echo ${arr[@]}
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echo "for loop 1:"
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for item in ${arr[@]}
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do
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echo $item
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done
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echo "for loop 2:"
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for i in ${!arr[@]}; do
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echo "element $i is ${arr[$i]}"
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done
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echo "\${arr[@]:2} : "${arr[@]:2}
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echo "\${arr[@]:2:3} : "${arr[@]:2:3}

‎Bash-For-Loop.sh

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# Author : Jaydatt Patel
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for ((i=0; i<10; i++))
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do
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echo val : $i
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if [ $i -gt 5 ]
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then
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break
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fi
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done

‎Bash-If-elif-else-fi.sh

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# if [ exp ] && [ exp ] || [ exp ]...
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# then
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# .....
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# elif [ exp ] && [ exp ] || [ exp ]...
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# then
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# ....
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# else
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# .....
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# fi
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# Author : Jaydatt Patel
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#
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# exp : [ v1 -lt v2 ] && [ v1 -eq v2 ] || [ v1 -gt v2 ]
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# -lt : less than
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# -eq : equl to
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# -gt : greater than
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num=5
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if [ $num -lt 0 ]
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then
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echo "Negative"
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elif [ $num -gt 0 ]
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then
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echo "Positive"
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else
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echo "Neutral"
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fi
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ss="B"
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if [ $ss == "A" ]
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then
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echo "Apple"
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elif [ $ss == "B" ]
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then
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echo "Ball"
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else
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echo "Invalid"
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fi

‎Bash-Methcharacters.sh

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# Author : Jaydatt Patel
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# '#' for comment
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# echo "comment"
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# "\" to write script in mutiple lines
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echo \
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"Hello" \
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"World"
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# ";" for command seperator
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echo "Hello"; echo "World"
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# "*" for string expansion wildcard
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ls /bin/ba* # list all files or folders which start from 'ba'
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ls *.txt
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# "?" for single character expansion wildcard
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ls /bin/?ash # list all files or folders which has 4 char name and ending with 'ash'
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ls file2013-02-??.txt

‎Bash-String.sh

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# Author : Jaydatt Patel
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# tr to translate or replace character
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echo "Linux and shell scripting are awesome" | tr "aeiou" "_" # replace characters in string where char are a,e,i,o,u
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echo "Linux and shell scripting are awesome" | tr -c "aeiou" "_" # repalce other character in string ignoring a,e,i,o,u
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echo "Linux and shell scripting are awesome" | tr "[a-z]" "[A-Z]" # repalce charaters
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ss="Hello"
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# "\" escape with
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# interpret literal and evalute metachar with " " double coats
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echo "$ss World" # Out : Hello World
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echo "\$ss World" # Out : $ss World
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# escape all metacharacters with ' ' single coats
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echo '$ss World' # Out : $ss World
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echo '\$ss World' # Out : \$ss World

‎Bash-While-Loop.sh

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# Author : Jaydatt Patel
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# while [ exp ] && [ exp ] || [ exp ]...
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# do
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# ...
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# done
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# exp : [ v1 -lt v2 ] && [ v1 -eq v2 ] || [ v1 -gt v2 ]
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# -lt : less than
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# -eq : equl to
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# -gt : greater than
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num=0
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while [ $num -lt 10 ]
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do
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echo val : $num
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if [ $num -gt 5 ]
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then
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break
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fi
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((num++))
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done

‎Bash-pipe-prarallel-sequence.sh

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# Author : Jaydatt Patel
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# run command piping [command] | [command] | ......
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sort animal.txt | uniq
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sort animal.txt | uniq | tr "[a-z]" "[A-Z]"
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# multiple line piping
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cat animal.txt |\
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uniq |\
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tr "[a-z]" "[A-Z]"
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# Run Sequencially each command
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echo "Sequencial :"
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echo "AA" ; echo "BB" ; echo "CC" ; echo "DD" ;
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echo "EE"
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# Run Prallel each command
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echo "Parallel :"
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echo "A" & echo "B" & echo "C" &\
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echo "D" &\
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echo "E"

‎Bash-variables-read-export.sh

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# Author : Jaydatt Patel
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# get bash path location
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which bash
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bashPath=`which bash`
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echo bashPath
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# variable
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a=10
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b=15.5
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c=$((a+b))
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d=$c
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s1="String"
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echo ${a} ${b} ${c} ${d}
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# set to get all shell variables
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set
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# unset to delete variables
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unset a
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unset b c
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# env to list all environment variables
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env
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# read to read data from user
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a=0
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read a
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# export variable to child process
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export x
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export y=5
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‎Data-cat-head-tail-wc.sh

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# Author : Jaydatt Patel
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# cat for get file data
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echo "Get data : "
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cat age.txt
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cat animal.txt
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# head -n to get first n lines
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head -3 animal.txt
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# tail -n to get last n lines
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tail -3 animal.txt
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# wc to get number of lines, words counts and characters counts of files
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wc animal.txt
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wc -l animal.txt # to get line counts
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wc -w animal.txt # to get words count
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wc -c animal.txt # to get character counts
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