Let\u2019s take an plain text file, input.txt, that looks like this<\/p>\n
PATTERN-1\r\nFirst line of unimportant text\r\nSecond line of unimportant text\r\nPATTERN-2<\/pre>\nSome more texts (may\/ mayn’t be important!)
\nWe want to delete some of the lines from the file using the command line stream editor, sed.<\/p>\n1. Use the following command to delete the lines lying between PATTERN-1 and PATTERN-2 , excluding the lines containing these patterns:<\/p>\n
sed '\/PATTERN-1\/,\/PATTERN-2\/{\/\/!d}' input.txt<\/pre>\nIf you want to modify the file itself, instead of just the file stream, include the \u201c-i\u201d flag after sed.<\/p>\n
2. Use the following command to delete the lines lying between PATTERN-1 and PATTERN-2 , including the lines containing these patterns:<\/p>\n
sed '\/PATTERN-1\/,\/PATTERN-2\/d' input.txt<\/pre>\n3. To delete all the lines after PATTERN-2, use this<\/p>\n
sed '\/PATTERN-1\/,$d' input.txt<\/pre>\n4. To delete lines, say 2 through 4 (if you know the correct line numbers, of course!), use this<\/p>\n
sed '2,4d' input.txt<\/pre>\n