Adding line in middle of file using command in linux

1. How do you add a line to a file in Linux?
2. How do I add a line of text to the middle of a file using bash?
3. How do I display a specific line in a file in Linux?
4. How do I add text to an existing file in Linux?
5. How do I add a line in Unix?
6. How do you add a line to the beginning of a file Unix?
7. How do I add a line in bash?
8. How do you add a line at the end of a file in Linux using SED?
9. How do you add a tab in SED?
10. How do I show the first line of a file in Linux?
11. How do I view lines in Linux?
12. How do I see the last 10 lines in Linux?

How do you add a line to a file in Linux?

sed - Inserting Lines in a File

1. Insert line using the Line number. This will insert the line before the line at line number 'N'. Syntax: sed 'N i <LINE-TO-BE-ADDED>' FILE.txt Example: ...
2. Insert lines using Regular expression. This will insert the line before every line where pattern match is found. Syntax:

How do I add a line of text to the middle of a file using bash?

1. -i : edit file in place.
2. -e : allows the execution of a script/commands inside sed expression.
3. a mynewtext : command that tells sed to insert the text mynewtext after matched pattern.

How do I display a specific line in a file in Linux?

How to Display Specific Lines of a File in Linux Command Line

1. Display specific lines using head and tail commands. Print a single specific line. Print specific range of lines.
2. Use SED to display specific lines.
3. Use AWK to print specific lines from a file.

How do I add text to an existing file in Linux?

If you want to add a bit of new text to an existing text file, you use the cat command to do it directly from the command line (instead of opening it in a text editor). Type the cat command followed by the double output redirection symbol ( >> ) and the name of the file you want to add text to.

How do I add a line in Unix?

You can use the cat command to append data or text to a file. The cat command can also append binary data. The main purpose of the cat command is to display data on screen (stdout) or concatenate files under Linux or Unix like operating systems. To append a single line you can use the echo or printf command.

How do you add a line to the beginning of a file Unix?

14 Answers

Use sed 's insert ( i ) option which will insert the text in the preceding line. Also note that some non-GNU sed implementations (for example the one on macOS) require an argument for the -i flag (use -i '' to get the same effect as with GNU sed ).

How do I add a line in bash?

Sometimes we need to work with a file for programming purposes, and the new line requires to add at the end of the file. This appending task can be done by using 'echo' and 'tee' commands. Using '>>' with 'echo' command appends a line to a file.

How do you add a line at the end of a file in Linux using SED?

Insert a line in a File

You have to use the “-i” option with the “sed” command to insert the new line permanently in the file if the matching pattern exists in the file.

How do you add a tab in SED?

12 Answers

Just insert a literal tab instead (press Ctrl - V then Tab ).

How do I show the first line of a file in Linux?

Type the following head command to display first 10 lines of a file named “bar.txt”:

1. head -10 bar.txt.
2. head -20 bar.txt.
3. sed -n 1,10p /etc/group.
4. sed -n 1,20p /etc/group.
5. awk 'FNR <= 10' /etc/passwd.
6. awk 'FNR <= 20' /etc/passwd.
7. perl -ne'1..10 and print' /etc/passwd.
8. perl -ne'1..20 and print' /etc/passwd.

How do I view lines in Linux?

To do so:

1. Press the Esc key if you are currently in insert or append mode.
2. Press : (the colon). The cursor should reappear at the lower left corner of the screen next to a : prompt.
3. Enter the following command: set number.
4. A column of sequential line numbers will then appear at the left side of the screen.

How do I see the last 10 lines in Linux?

head -15 /etc/passwd

To look at the last few lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last number lines of the file.