├── LICENSE ├── README.md ├── access-mysql-mariabd ├── config.yaml ├── perform_db_operation.sh └── test.sh ├── comment_ex.sh ├── curl_command ├── curl_command_examples.sh └── curl_command_examples_get_token.sh ├── date_ex.sh ├── file_manipulation ├── names.txt ├── output.txt ├── reader.sh └── writer.sh ├── file_params.sh ├── for_while.sh ├── function.sh ├── function_sum.sh ├── function_sum_return_val.sh ├── function_sum_with_param.sh ├── if_elif_else.sh ├── pipe_ex.sh ├── read-properties-file ├── config.properties └── read_properties_file.sh ├── ternary_operator_ex └── test_ternary.sh └── variable_eample.sh /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # shell-scripting-examples 2 | This repository contains all the important shell/bash scripting examples anyone may need. 3 | 4 | Visit [Note Arena Linux Tutorials](https://notearena.com/course/linux/) for examples with descriptions. 5 | -------------------------------------------------------------------------------- /access-mysql-mariabd/config.yaml: -------------------------------------------------------------------------------- 1 | DB_NAME='' 2 | DB_HOST='127.0.0.1' #your database host 3 | DB_USER='root' #Database user 4 | #base64 encripted password 5 | #To genearte base64 encripted password, run command: echo -n "your-password" | base64 6 | DB_PASSWD='' -------------------------------------------------------------------------------- /access-mysql-mariabd/perform_db_operation.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | CWD="$(dirname "$0")" 3 | 4 | #Check if the config.yaml file exists 5 | if [ ! -f $CWD/config.yaml ]; then 6 | echo "Error:: No configuration file is found at the '$CWD' directory." 7 | exit 1 8 | fi 9 | 10 | #Load the config.yaml 11 | source $CWD/config.yaml 12 | 13 | DB_NAME=$DB_NAME 14 | DB_HOST=$DB_HOST 15 | DB_USER=$DB_USER 16 | DB_PASSWD=$DB_PASSWD 17 | 18 | echo $DB_NAME 19 | 20 | function checkConnectionParam { 21 | if [ -z "$DB_HOST" ]; then 22 | echo "Error:: No database host is supplied." 23 | exit 1 24 | fi 25 | 26 | if [ -z "$DB_NAME" ]; then 27 | echo "Error:: No database name is supplied." 28 | exit 1 29 | fi 30 | 31 | if [ -z "$DB_USER" ]; then 32 | echo "Error:: No database username is supplied." 33 | exit 1 34 | fi 35 | 36 | if [ -z "$DB_PASSWD" ]; then 37 | echo "Error:: No database password is supplied." 38 | exit 1 39 | else 40 | #Converting base64 encripted password to the original password 41 | DB_PASS_ORG=`echo "$DB_PASSWD" | base64 --decode` 42 | #echo "$DB_PASS_ORG" 43 | fi 44 | 45 | } 46 | 47 | function runQuery { 48 | #checking the database connection param 49 | checkConnectionParam 50 | 51 | QUERY=$1 52 | if [ -z "$QUERY" ]; then 53 | echo "Error:: No database query string is supplied!" 54 | exit 1 55 | fi 56 | 57 | mysql -u"$DB_USER" -p"$DB_PASS_ORG" --database $DB_NAME -se "$QUERY" | while read -r result; 58 | do 59 | #Echo/Return the query results 60 | echo "$result" 61 | done 62 | 63 | } -------------------------------------------------------------------------------- /access-mysql-mariabd/test.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | CWD="$(dirname "$0")" 4 | 5 | . ./perform_db_operation.sh 6 | 7 | #Call the runQuery function from the perform_db_operation.sh file 8 | tables=$(runQuery "show tables") 9 | 10 | for table in "${tables[@]}" 11 | do 12 | echo "$table" 13 | done 14 | 15 | #Get all the rowd from a table 16 | all_vals=$(runQuery "select * from account") 17 | 18 | for val in "${all_vals[@]}" 19 | do 20 | echo "$val" 21 | done -------------------------------------------------------------------------------- /comment_ex.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | #Single line comment 3 | 4 | echo "hello world!" 5 | : 'This is a multi 6 | line comment 7 | ' 8 | echo new world! 9 | -------------------------------------------------------------------------------- /curl_command/curl_command_examples.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | ############################################################# 3 | # @Mamun Kayum # 4 | # Uncomment to use the curl commands # 5 | # # 6 | ############################################################# 7 | 8 | # Downloading a file 9 | curl -o data.txt https://example.com/data.txt 10 | 11 | # Uploading a file 12 | curl -F "file=@/path/to/local/file.txt" https://example.com/upload 13 | 14 | # Sending data using HTTP POST 15 | curl -d "param1=value1¶m2=value2" https://example.com/post 16 | 17 | # Specifies the name of the file to which the data should be saved. For example, 18 | curl -o data.txt https://example.com/data.txt 19 | 20 | # Saves the output with the same name as the remote file. For example: 21 | curl -O https://example.com/data.txt 22 | 23 | # Sets a header for the request. For example: 24 | curl -H "Authorization: Bearer TOKEN" https://example.com/api 25 | 26 | # Sets the username and password for the request. For example: 27 | curl -u username:password https://example.com/api 28 | 29 | -------------------------------------------------------------------------------- /curl_command/curl_command_examples_get_token.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | ############################################################# 3 | # @Mamun Kayum # 4 | # # 5 | ############################################################# 6 | 7 | # Set the URL of the authentication endpoint 8 | AUTH_URL="https://example.com/auth" 9 | 10 | # Set the credentials to use for authentication 11 | USERNAME="user" 12 | PASSWORD="pass" 13 | 14 | # Use curl to authenticate and obtain a token 15 | TOKEN=$(curl -s -X POST -H "Content-Type: application/json" -d '{"username": "'"$USERNAME"'", "password": "'"$PASSWORD"'"}' $AUTH_URL | jq -r '.token') 16 | 17 | # Check if the token was obtained successfully 18 | if [ -z "$TOKEN" ]; then 19 | echo "Failed to obtain authentication token" 20 | exit 1 21 | fi 22 | 23 | # Set the URL of the resource to access 24 | RESOURCE_URL="https://example.com/resource" 25 | 26 | # Use curl with the token to access the resource 27 | curl -s -H "Authorization: Bearer $TOKEN" $RESOURCE_URL 28 | -------------------------------------------------------------------------------- /date_ex.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | echo Today date is : $(date) 3 | 4 | #Date format yyyy-mm-dd 5 | date=$(date '+%Y-%m-%d') 6 | echo $date 7 | 8 | #Date format yyyy-mm-dd HH:MM:SS 9 | date2=$(date '+%Y-%m-%d %H:%M:%S') 10 | echo $date2 11 | 12 | echo $(date '+%Y-%m-%d') -------------------------------------------------------------------------------- /file_manipulation/names.txt: -------------------------------------------------------------------------------- 1 | Abel 2 | Maria 3 | Richard 4 | Tom 5 | Rene 6 | -------------------------------------------------------------------------------- /file_manipulation/output.txt: -------------------------------------------------------------------------------- 1 | LINE 1: Abel 2 | LINE 2: Maria 3 | LINE 3: Richard 4 | LINE 4: Tom 5 | LINE 5: Rene 6 | -------------------------------------------------------------------------------- /file_manipulation/reader.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | COUNT=1 3 | #Internal Field Separator (IFS) that is used for word splitting 4 | #after expansion and to split lines into words with the read builtin command 5 | while IFS='' read -r LINE 6 | do 7 | echo "LINE $COUNT: $LINE" 8 | ((COUNT++)) 9 | #$1 gets the file passed as a parameter while running the script 10 | done < "$1" 11 | 12 | exit 0 13 | -------------------------------------------------------------------------------- /file_manipulation/writer.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | COUNT=1 3 | touch output.txt 4 | #Internal Field Separator (IFS) that is used for word splitting 5 | #after expansion and to split lines into words with the read builtin command 6 | while IFS='' read -r LINE 7 | do 8 | echo "LINE $COUNT: $LINE" >> output.txt 9 | ((COUNT++)) 10 | #$1 gets the file passed a parameter while running the script 11 | done < "$1" 12 | 13 | exit 0 14 | -------------------------------------------------------------------------------- /file_params.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | #Run shellscript with a parameter 3 | colour=$1 4 | echo Colour of Olive is $colour 5 | 6 | #$0 is the current file name 7 | echo File name: $0 8 | -------------------------------------------------------------------------------- /for_while.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | NUMBERS=$@ 4 | 5 | for NUMBER in $NUMBERS 6 | do 7 | if [ $NUMBER -lt 10 ]; then 8 | continue 9 | fi 10 | echo "Number is less or greater than 10, number: $NUMBER" 11 | done 12 | 13 | echo "for loop completed." 14 | 15 | COUNTER=0 16 | while [ $COUNTER -le 5 ] 17 | do 18 | echo "COUNT = $COUNTER" 19 | ((COUNTER++)) 20 | done 21 | 22 | echo "while loop completed." 23 | exit 0 24 | -------------------------------------------------------------------------------- /function.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | #Function with function keyword 4 | #Functions name starts with a verb 5 | function sayHello() { 6 | local NAME=$1 7 | echo "Hello $NAME. Welcome to shellscripting." 8 | } 9 | 10 | #Function without function keyword 11 | sayGoodbye() { 12 | echo "Goodbye $1. See you later." 13 | } 14 | 15 | #Functions are invoked as normal shell command 16 | echo "Calling the sayHello function with param" 17 | sayHello Olive 18 | 19 | echo "Calling the sayGoodbye function" 20 | sayGoodbye Olivia 21 | 22 | exit 0 23 | 24 | -------------------------------------------------------------------------------- /function_sum.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | #Functions to add two numbers 4 | function addNumbers() { 5 | local number1=10 6 | local number2=50 7 | local sum=$((number1+number2)) 8 | echo "Summation is: $sum" 9 | } 10 | 11 | #Call the function 12 | addNumbers -------------------------------------------------------------------------------- /function_sum_return_val.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | #Functions to add two numbers 4 | function addNumbers() { 5 | local number1=$1 6 | local number2=$2 7 | local sum=$((number1+number2)) 8 | #Returning the value, 9 | #echo will act as a return statement if we call this function like below with $ 10 | echo "$sum" 11 | } 12 | 13 | #Call the function and passing the parameter, assiging the returned value to 14 | #new variable summation 15 | summation=$(addNumbers 10 50) 16 | echo "Summation is: $summation" -------------------------------------------------------------------------------- /function_sum_with_param.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | #Functions to add two numbers 4 | function addNumbers() { 5 | local number1=$1 6 | local number2=$2 7 | local sum=$((number1+number2)) 8 | echo "Summation is: $sum" 9 | } 10 | 11 | #Call the function and passing the parameter 12 | addNumbers 10 50 -------------------------------------------------------------------------------- /if_elif_else.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | FRUIT_NAME=$1 4 | if [ "$FRUIT_NAME" = "Olive" ]; then 5 | echo "The fruit name is Olive" 6 | else 7 | echo "The fruit is not Olive" 8 | fi 9 | 10 | AGE=$2 11 | 12 | if [ $AGE -lt 13 ]; then 13 | echo "You're a child" 14 | elif [ $AGE -ge 13 ] && [ $AGE -lt 19 ]; then 15 | echo "You're a teenager" 16 | else 17 | echo "You're a perfect fit!" 18 | fi 19 | -------------------------------------------------------------------------------- /pipe_ex.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | FILES=`ls -1 | sort -r | head -3` 4 | COUNT=1 5 | 6 | for FILE in $FILES 7 | do 8 | echo "File #$COUNT = $FILE" 9 | ((COUNT++)) 10 | done 11 | 12 | exit 0 13 | -------------------------------------------------------------------------------- /read-properties-file/config.properties: -------------------------------------------------------------------------------- 1 | config.name=Mamun 2 | config.work.hours=37.5 3 | -------------------------------------------------------------------------------- /read-properties-file/read_properties_file.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | FILE_NAME="config.properties" 3 | function getPropVal { 4 | value= grep "${1}" ./$FILE_NAME|cut -d'=' -f2 5 | if [[ -z "$value" ]]; then 6 | echo "Key not found" 7 | exit 1 8 | fi 9 | echo $value 10 | } 11 | 12 | #Get the value with key 13 | function testPropertyVal { 14 | NAME=($(getPropVal 'config.name')) 15 | echo $NAME 16 | } 17 | 18 | #Call the testPropertyVal function 19 | testPropertyVal 20 | -------------------------------------------------------------------------------- /ternary_operator_ex/test_ternary.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | #if the variable VAR is not set, set num=20 4 | num=${VAR:-20} 5 | echo $num 6 | 7 | #Another way(best) 8 | a=20 9 | b=30 10 | val=$([ "$a" == 5 ] && echo "$a" || echo "$b") 11 | echo $val 12 | 13 | #This one is best for only numeric comparisons and assignments 14 | c=40 15 | d=50 16 | test="abc" 17 | value=$(( a==20 ? c : d )) 18 | echo $value -------------------------------------------------------------------------------- /variable_eample.sh: -------------------------------------------------------------------------------- 1 | #!usr/bin/env bash 2 | #space is not allowed in either sides of the equal sign 3 | name=Olive 4 | colour=Green 5 | 6 | echo Colour of $name is $colour. 7 | #String cannot have space inside, use quatation mark 8 | full_name="Green Olive" 9 | echo $full_name 10 | --------------------------------------------------------------------------------