How do I remove a line from a string in Unix?

How do I remove a line from a string in Linux?

Use the sed command to delete lines containing the specified string. In the following example, we will use the action option of the sed command to delete lines containing the specified string in the text file. As follows, we delete the line that contains the string “sed” in the file.

How do I delete a single line in Linux?

You can use the “stream editor for filtering and transforming text” sed. Here, -i means edit the file inplace. d is the command to “delete the pattern space; immediately start next cycle”.

How do I remove a character from a string in Unix?

Remove Character from String Using tr

The tr command (short for translate) is used to translate, squeeze, and delete characters from a string. You can also use tr to remove characters from a string. For demonstration purposes, we will use a sample string and then pipe it to the tr command.

How do I remove the last 10 lines in Unix?

It’s a little roundabout, but I think it’s easy to follow.

1. Count up the number of lines in the main file.
2. Subtract the number of lines you want to remove from the count.
3. Print out the number of lines you want to keep and store in a temp file.
4. Replace the main file with the temp file.
5. Remove the temp file.

How do you delete a line in a file?

Use del to delete a line from a file where its position is known {#use-del)

1. a_file = open(“sample.txt”, “r”) get list of lines.
2. lines = a_file. readlines()
3. a_file.
4. del lines[1] delete lines.
5. new_file = open(“sample.txt”, “w+”) write to file without line.
6. for line in lines:
7. new_file. write(line)
8. new_file.

How do I remove the first 10 lines in Unix?

Remove first N lines of a file in place in unix command line

1. Both sed -i and gawk v4.1 -i -inplace options are basically creating temp file behind the scenes. IMO sed should be the faster than tail and awk . – …
2. tail is multiple times faster for this task, than sed or awk . (

How do I remove the last line in Unix?

6 Answers

1. Use sed -i ‘$d’ <file> to edit file in place. – …
2. What would be for deleting the last n lines, where n is any integer number? – …
3. @JoshuaSalazar for i in {1..N}; do sed -i ‘$d’ <file>; done dont forget to replace N – ghilesZ Oct 21 ’20 at 13:23.

How do I remove the first line in Unix?

To delete a particular line in file:

1. Delete first line sed ‘1d’ file.
2. Delete first and third line sed ‘1d3d’ file.

How do I remove a character from a file in Linux?

Remove CTRL-M characters from a file in UNIX

1. The easiest way is probably to use the stream editor sed to remove the ^M characters. Type this command: % sed -e “s/^M//” filename > newfilename. …
2. You can also do it in vi: % vi filename. Inside vi [in ESC mode] type: :%s/^M//g. …
3. You can also do it inside Emacs.

How do you remove multiple lines in Unix?

Deleting Multiple Lines

1. Press the Esc key to go to normal mode.
2. Place the cursor on the first line you want to delete.
3. Type 5dd and hit Enter to delete the next five lines.

How do I remove the last character of a string in shell?

Bash/ksh shell substitution example

The syntax to remove last character from line or word is as follows: x=”foo bar” echo “${x%?}”