\s(star) means zero or more spaces. $ means end of line. To remove empty lines, we can use ^\s $ regular expression.
Sed replace or remove empty lines in a file (sed) (can) (also) (replace) (text) (globally) ( and) (selectively) ( in) (a) (file). In the following command, we are using ampersand (&) character to save each word. Let us say we want to add round () brackets around each word in line 3. Sed can replace a string with additional characters. Sed replace a string with additional characters cat example.txt | sed -n '/selectively/ s/file/doc/gp' The below command has the same affect as we saw above. In following command we are passing the out of cat to sed. Note: Instead of providing file, sed can also read from the standard input. Sed replace pattern from piped (another command) output sed -n '/selectively/ s/file/doc/gp' example.txtīelow command will look for lines starting from line with a pattern "selectively" (line 3) till the lines with pattern "content" (last line) and then replace pattern "file" with "doc" sed -n '/selectively/,/content/ s/file/doc/gp' example.txt
Sed replace pattern2 based on another pattern1īelow sed command will only replace "word" file with "doc" in line where the pattern "selectively" is found which is line number 3. Also note word 'file' has been replaced with word doc in above line. sed -n '3 s/file/doc/gp' example.txtĪs we see above command, only prints line number 3. To make sure we print only the line which includes pattern, we have to use with switch -n in the beginning as shown below. If we use p, p will print every line twice. Let us rerun the above command but this time we will print only line number 3. Replace pattern on specific line number Below sed command will replace word "file" only on line number 3. Sed replace pattern or string on nth line > sed can be used to print the content of file and replace text as well in file sed can also replace text globally and selectively in a file. > sed can be used to replace text in a file. > sed can be used to print the content of doc and replace text as well in docīelow command will replace every occurrence of word "file" with word "doc" starting from 3rd line and onwards. sed can also replace text globally and selectively in a doc. > sed can be used to replace text in a doc. > sed is a great utility for doc processing in Linux. Below command will replace all occurrences of word 'file' with word 'doc'. Sed replaces every occurrence of specific word.
Sed replace every occurrence of pattern or string with global option g > sed can be used to print the content of file and replace text as well in doc > sed is a command line utility in Linux which replaces text. > sed is a great utility for file processing in Linux. So we should see in line number 3 and 6, 2nd occurrence of word 'file' will be replaced with 'doc'. Replace 2nd occurrence of word file with doc. Sed replace nth occurrence of word or string sed can also replace text globally and selectively in a file." > example.txtĮcho "sed is a command line utility in Linux which replaces text." > example.txtĮcho "sed can be used to print the content of file and replace text as well in file" > example.txt echo "sed is a great utility for file processing in Linux." > example.txtĮcho "sed can be used to replace text in a file. Let us create a dummy text file example.txt with text shown below. Also checkout my short tutorial on replace white text using sed and awk. In this post, we will go over 'how to use sed to replace text'.
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