Contents
How to delete all lines in a text file?
The first command edits the file (s) inplace (-i). The second command does the same thing but keeps a copy or backup of the original file (s) by adding .bk to the file names (.bk can be changed to anything). Just in case someone wants to do it for exact matches of strings, you can use the -w flag in grep – w for whole.
When do you remove line with pattern match?
If there is a match, the (complete) line with the matching pattern and the next line get removed. The next line always appears after the line with the pattern match, but in addition it appears in other areas of the file.
How to delete lines with specific string Besides SED?
There are many other ways to delete lines with specific string besides sed: And of course sed (printing the inverse is faster than actual deletion): You can use sed to replace lines in place in a file. However, it seems to be much slower than using grep for the inverse into a second file and then moving the second file over the original.
How to remove lines between if and end if?
The example below removes lines between “if” and “end if”. All files are scanned, and lines between the two matching patterns are removed ( including them ). IFS=’ ‘ PATTERN_1=”^if” PATTERN_2=”end if” # Search for the 1st pattern in all files under the current directory.
How to delete lines that contain certain string in Python?
I’m trying to read a text from a text file, read lines, delete lines that contain specific string (in this case ‘bad’ and ‘naughty’). The code I wrote goes like this:
How to delete a range of lines in a sql file?
You can also delete a range of lines in a file. For example to delete stored procedures in a SQL file. This will remove all lines between CREATE PROCEDURE and END ;. I have cleaned up many sql files withe this sed command.
How to delete a 4th Line from a file?
For example, to delete the 4th line from a file You can use the “stream editor for filtering and transforming text” sed. Here, -i means edit the file inplace. d is the command to “delete the pattern space; immediately start next cycle”. 4 means the 4th line.