Mastering the sed Command in Linux

What is the basic syntax of the sed command?

• sed [options] 'input-file' 'script'

• sed [options] 'script' [input-file]

• sed [input-file] 'script'

• sed 'script' [input-file] [options]

How do you perform substitution in a string using sed?

• sed 's/pattern/replacement/' filename

• sed 's/pattern/replacement/g' filename

• sed 'r pattern/replacement/' filename

• sed 's/replacement/pattern/' filename

Which sed command is used to delete a specific line from a file?

• sed -i 'Nd' filename

• sed -n 'Nd' filename

• sed 'N!d' filename

• sed -e 'Nd' filename

How can you insert text before a specific line using sed?

• sed '3s/^/text to insert /' filename

• sed '3c ext to insert' filename

• sed '3i\text to insert' filename

• sed '3a ext to insert' filename

What is the purpose of the 's' command in sed?

• The 's' command formats output for display.

• The 's' command is for searching text.

• The 's' command is used for deleting lines.

• The 's' command in sed is for substitution.

How do you use sed to delete all blank lines in a file?

• sed -e '/^$/d' filename

• sed -n '/./p' filename

• sed -i '/^$/d' filename

• sed -i '/^/d' filename

What is the command to replace 'foo' with 'bar' in a file using sed?

• sed 's/foo/bar/' filename

• sed -i 's/foo/bar/g' filename

• sed -i 's/bar/foo/g' filename

• sed -e 's/foo/bar/g' filename

How can you append text after a specific line number using sed?

• sed 'N a\text' filename

• sed 'N i ext' filename

• sed 'N c ext' filename

• sed 'N s/.*/text/' filename

What does the '-i' option do when using sed?

• The '-i' option displays the contents of a file.

• The '-i' option is used to ignore case sensitivity.

• The '-i' option creates a backup of the original file.

• The '-i' option allows in-place editing of files.

How can you use sed to match a pattern with regular expressions?

• Use 'sed -i 's/regex_pattern/replacement/' filename' to replace a pattern.

• Run 'sed -n '/regex_pattern/' filename' to suppress output.

• Execute 'sed 's/regex_pattern//g' filename' to delete a pattern.

• Use 'sed -e '/regex_pattern/' filename' to match a pattern with regular expressions.