Sed Commands – Ranges of lines

A Stream EDitor is used to perform basic transformations on text read from a file or a pipe. The result is sent
to standard output. The syntax for the sed command has no output file specification, but results can be saved
to a file using output redirection. The editor does not modify the original input.

Command   Result
a\        Append text below current line
c\        Change text in the current line with new text
d         Delete text
i\        Insert text above the current line
p         Print text
r         Read a file
s         Search and replace text
w         Write to a file 

This is our example text file: (FILENAME : fuckthecode)

$ cat -n fuckthecode

     1	First line fcukthecode
     2	second line fcuk the code
     3	third line fuckkk thee codee
     4	fourth line fuk the coed
     5	fifth line and fuckin yeah

Now, we want to take out the lines 2 to 4. Specify this range to address, together with the d command:
sed ‘2,4d’ filename (lines 2 to 4) (d command is for deleting text)

$ sed '2,4d' fuckthecode

First line fcukthecode
fifth line and fuckin yeah

To delete the file starting from a certain line until the end of the file, use a command similar to this:

$ sed '2,$d' fuckthecode

First line fcukthecode

Now, we want to print the lines 2 to 4. Specify this range to address, together with the p command:

$ sed -n '2,4p' fuckthecode

second line fcuk the code
third line fuckkk thee codee
fourth line fuk the coed

To print the file starting from a certain line until the end of the file, use a command $ to this:

$ sed -n '2,$p' fuckthecode

second line fcuk the code
third line fuckkk thee codee
fourth line fuk the coed
fifth line and fuckin yeah

More Q

• Find the majority element appearing more than n/2 times
• Return an array of the squares of each number.
• Highest factor in addition.
• Find the empty packets(0) of chocolate and push it to the end of the conveyor belt(array).
• Every element in array appears twice.Find that single one.
• Find the duplicate letters in string. Same to do in dictionary way.
• Find minimum number of edits (operations) required to convert ‘str1’ into ‘str2’.
• Return the maximum number you can get by changing at most one digit.
• Sed Commands – Ranges of lines.
• Find the kth smallest element in the given 2D array.
• Find all elements that appear more than [n/3] times.
• Write a function to return true if s2 contains the permutation of s1.
• Sort the array into a wave like array.
• Re-order array, such that nums[0] < nums[1] > nums[2] < nums[3]....
• Given the coordinates, return true if the four points construct a square.
• Minimum Distance Between Words of a String.
• Return the shortest distance between these two words.
• Write a program to find the n-th ugly number.
• Check if array could become Non – Decreasing array.
• Find the minimum area of a rectangle that can be formed from given points.