Shell: Delete/Preserve a specified line in a file

Delete the first line in the file file1 to the line containing word characters and redirect to the file File2:

Sed ' 1,/word/d ' file1 > File2

Keep the lines in the file file1 that contain word characters and redirect to the file File2,-n to indicate that the results are not printed to the screen:

Sed-n '/word/p ' file1 > File2

Delete the contents of the >=21 line in the file file1, and-I means to save the changes directly in the FILE1:

Sed-i ', $d ' file1

Multiple conditions are separated by semicolons:

sed ' 1,/word1/d;21, $d;/word2/d ' file1 > File2

Shell: Delete/Preserve a specified line in a file