Do more with Less command in Unix_______________________
1. Search Navigation
Once you’ve opened a log file (or any file) using less file-name, use the following keys to search. Please note that the match will be highlighted automatically by default.
/ – search for a pattern which will take you to the next occurrence.
n – for next match in forward
N – for previous match in backward
? – search for a pattern which will take you to the previous occurrence.
n – for next match in backward direction
N – for previous match in forward direction
Tip: If you dont bother about which direction the search is happening, and you want to search file path, or URL, such as “/home/amit/”, you can use backward search (?pattern) which will be handy as you don’t want to escape slashes each time.
In forward: /\/home\/amit\/
In backward: ?/home/amit/
2. On Screen
Use the following screen navigation commands while viewing large log files.
CTRL+F – forward one window
CTRL+B – backward one window
CTRL+D – forward half window
CTRL+U – backward half window
3. Line navigation
In a smaller chunk of data, where you want to locate particular error, you may want to navigate line by line using these keys:
j – navigate forward by one line
k – navigate backward by one line
4. Other Navigations
The following are other navigation operations that you can use inside the less pager.
G – go to the end of file
g – go to the start of file
q or ZZ – exit the less pager
5. Simulate tail -f inside less pager – Press F
Once you’ve opened a file using less command, any content that is appended to the file after that will not be displayed automatically. However, you can press Fless command will show the status ‘waiting for data‘. This is as similar to ‘tail -f’.
6. Less Command – Counting line
10j – 10 lines forward.
10k – 10 lines backward.
CTRL+G – show the current file name along with line, byte and percentage statistics.
7. Other useful Less Command Operations
v – using the configured editor edit the current file.
h – summary of less commands
&pattern – display only the matching lines, not all.
8. Open any types of files using less command
less command to Open & view 10 different file types.
9. Less Command – Marked navigation
When you are viewing a large log file using less command, you can mark a particular position and return back to that place again by using that mark.
ma – mark the current position with the letter ‘a’,
Some time we got machine to work where we don't have access rights to install anything or if you do not want to install. You can get latest jdk running by this trick. Just follow step step & do comment if you like it.
5.Go inside E:\jdk-8u102-windows-x64\.rsrc\1033\JAVA_CAB10you will find 111 file.
6.extract it it some folder where you can find tools.zip again extract that to some folder say Java & copy it to very first folder of setup along with .data,.rsrc etc.
7.Go to folder where you have co…
So basically these are just collection of best practices to solve recurring problem by different kind of class arrangement. These arrangement could be based on creation of object or structural basis or on basis of required behavior.
Creational Design Pattern Prototype Designpattern
we will like to use this designpattern whenever creation of initial object & setting required default values is costly. So we just create 1 object & later on whenever more objects required we can provide initial object by just cloning of given object.Java Example is java.lang.Object#clone() Builder DesignPattern
When we jave object structure are complex and complicated we would go for this.
we will be separating object creation from internal representation. With help of some simple interface we would create complicated Object. Singleton
When we need one instance per JVM. Example : Java Run time environment Java.lang.System. java.lang.StringBuilder, Spring Beans are singleton …