Merge pull request #328 from biswajitdas-007/javascript

String methods added

languages/javascript.js

@@ -95,3 +95,9 @@ arr.reduce(callback[, initialValue])                 // Apply a function against
 arr.reduceRight(callback[, initialValue])            // Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value.
 arr.some(callback[, initialValue])                   // Returns true if at least one element in this array satisfies the provided testing function.
 arr.values()                                         // Returns a new Array Iterator object that contains the values for each index in the array.
+
+// String methods
+String.charAt(index)                                 // Returns the character at the specified index in a string.
+String.indexOf(character)                            // Returns the index of the first occurrence of a specified value in a string.
+String.substring(starting_index, ending_index)       // Returns a new string that is a subset of the original string.
+String.substring(starting_index)                     // Returns a substring from starting index to last index of string.

tools/cronjob.txt

@@ -1,68 +0,0 @@
-CRONTAB, is a time-based job scheduler in Unix like operating systems. 
-In laymen term, it is used to execute scripts on your machine at a predefined time or interval. 
-This can be any script, for instance downloading images from a particular website every hour or generating a pdf of your unread emails from the past day and the list goes on
-
-
-###################################
-BASICS
-###################################
-
-Each line of a crontab represents a job and it looks as follows:
-
-* * * * * command_name
-
-Each asterisk here has a special meaning :
-Asterisk 1 : Represents minutes from 0 to 59
-Asterisk 2 : Represents hour of the day from 0 to 23
-Asterisk 3: Represents day of the month from 1 to 31
-Asterisk 4: Represents a month from 1 to 12
-Asterisk 5: Represents the day of the week from 0 to 6 (Sunday to Saturday)
-Command : A command that executes a script
-
-Example : 0 10 * * * /bin/bash print_time.sh
-You can play with these settings from the following site : https://crontab.guru
-
-The above example will execute the script print_time.sh using the /bin/bash shell, everyday at 10:00 A.M. 
-Crontab uses a 24 hour clock
-Providing the full path to the script is necessary
-Providing a shell name or a specific interpreter is necessary too
-
-We can also use the following strings to define job.
-
-@reboot	Run once, at startup.
-@yearly	Run once a year.
-@annually	(same as @yearly).
-@monthly	Run once a month.
-@weekly	Run once a week.
-@daily	Run once a day.
-@midnight	(same as @daily).
-@hourly	Run once an hour.
-
-@reboot <command-to-execute> # run a job every time the system reboots
-
-###################################
-CREATING CRONTAB JOBS
-###################################
-
-crontab -e # this opens up the crontab file in your predefined editor
-
-# create a basic cronjob that runs everyday at 10:00 A.M.
-0 10 * * * /bin/bash ~/Documents/collect_log.sh 
-
-- this cronjob will get executed everyday at 10:00 AM
-- note the leading 0 is important
-- /bin/bash is the interpreter here, and this is required
-- ~/Documents/collect_log.sh is the absolute path to the script to be executed
-
-
-
-###################################
-VIEW CRONJOBS FOR THE CURRENT USER
-###################################
-crontab -l 
-
-
-##########################################
-REMOVE ALL CRONJOBS FOR THE CURRENT USER
-##########################################
-crontab -r

tools/ubuntu.sh

@@ -21,6 +21,7 @@ cat /proc/<process_id>/maps   # Show the current virtual memory usage of a Linux
 ip r # Display ip of the server
 
 lsof -i :9000 # List process running on port 9000
+kill -9 $(lsof -t -i:PORT) # Kill the process running on whichever port specified
 
 journalctl -u minio.service -n 100 --no-pager # List last 100 logs for specific service