How to Insert a Line after the Match using 'sed'?

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.

1. How do you insert a line in a SED file?
2. How do you grep a line after a match?
3. How can I replace text after a specific line using sed?
4. How do you add multiple lines using sed?
5. How do you add a new line in shell script?
6. How do you add a new line in Linux?
7. How do you use awk?
8. How do you grep multiple lines?
9. How do you grep 5 lines before and after?

How do you insert a line in a SED file?

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 you grep a line after a match?

To also show you the lines before your matches, you can add -B to your grep. The -B 4 tells grep to also show the 4 lines before the match. Alternatively, to show the log lines that match after the keyword, use the -A parameter. In this example, it will tell grep to also show the 2 lines after the match.

How can I replace text after a specific line using sed?

4 Answers

1. sed -i 's/p/r/' file replace p with r in file.
2. \( start first group.
3. rmd_ver= search pattern.
4. \) end first group.
5. \( start second group.
6. .* any characters.
7. \) end second group.
8. \1 back reference to the first group.

How do you add multiple lines using sed?

1. STEP 1 copy until the pattern. sed '/THEPATTERNYOUARELOOKINGFOR/Q' $FILENAME >>$FILENAME_temp.
2. STEP 2 add your lines. cat << 'EOL' >> $FILENAME_temp HERE YOU COPY AND PASTE MULTIPLE LINES, ALSO YOU CAN //WRITE COMMENTS AND NEW LINES AND SPECIAL CHARS LIKE $THISONE EOL.
3. STEP 3 add the rest of the file.

How do you add a new line in shell script?

The most used newline character

If you don't want to use echo repeatedly to create new lines in your shell script, then you can use the \n character. The \n is a newline character for Unix-based systems; it helps to push the commands that come after it onto a new line.

How do you add a new line in Linux?

For example, you can use the echo command to append the text to the end of the file as shown. Alternatively, you can use the printf command (do not forget to use \n character to add the next line). You can also use the cat command to concatenate text from one or more files and append it to another file.

How do you use awk?

awk Scripts

1. Tell the shell which executable to use to run the script.
2. Prepare awk to use the FS field separator variable to read input text with fields separated by colons ( : ).
3. Use the OFS output field separator to tell awk to use colons ( : ) to separate fields in the output.
4. Set a counter to 0 (zero).

How do you grep multiple lines?

How do I grep for multiple patterns?

1. Use single quotes in the pattern: grep 'pattern*' file1 file2.
2. Next use extended regular expressions: egrep 'pattern1|pattern2' *. py.
3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
4. Another option to grep two strings: grep 'word1\|word2' input.

How do you grep 5 lines before and after?

Show lines before and after with grep

1. -A num. Print num lines of trailing context after each match. See also the -B and -C options.
2. -B num. Print num lines of leading context before each match. See also the -A and -C options.
3. -C [num] Print num lines of leading and trailing context surrounding each match. The default is 2 and is equivalent to -A 2 -B 2.