How to delete lines with specific string Besides SED?

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 all lines containing special characters?

I need a sed command that will exclude these lines containing special character, numbers, or spaces. I’ve found that it is fairly straightforwards removing lines with spaces by using and I imagine that removing lines containing numbers will be a similar strategy using regex.

How to delete a line with its line number?

You can delete a particular single line with its line number by sed -i ’33d’ file This will delete the line on 33 line number and save the updated file.

Can a sed script save a file of line numbers?

Humorously (but perhaps slightly confusingly) you can do this with sed. This accepts a file of line numbers, one per line, and produces, on standard output, the same line numbers with d appended after each. This is a valid sed script, which we can save to a file, or (on some platforms) pipe to another sed instance:

How to delete a line containing specific string in file?

SED is an Stream Editor having capability to remove lines from file having specific string. Using -i with sed we can remove line in same file. Remove all lines from /var/log/messages having string “DELETE THIS TEXT” and restore output in new file. Do not make any changes in original line.

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 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.

Is there a way to convert uppercase to lowercase in GNU sed?

It has to be done with a sed replacement somehow. or a shorter way with GNU sed, working with any character for which a lowercase<->uppercase conversion exists in your locale: POSIXly, that can’t be done with sed except by providing the complete set of letters you want to transliterate as @cuonglm has shown.

How to convert file contents to lower case?

The LC_ALL=C is to protect any multibytes in input – though any multibyte capitals will not be converted. The same is true for (GNU) tr – both apps are prone to input mangling in any non-C locale. iconv can be combined with either for a comprehensive solution.

How to replace a string in Linux with SED?

The above sed command replaces the string only on the third line. Duplicating the replaced line with /p flag : The /p print flag prints the replaced line twice on the terminal. If a line does not have the search pattern and is not replaced, then the /p prints that line only once. $sed ‘s/unix/linux/p’ geekfile.txt.

Which is an example of the sed command?

Here the sed command replaces the lines with range from 1 to 3. Another example is Here $ indicates the last line in the file. So the sed command replaces the text from second line to last line in the file. Deleting lines from a particular file : SED command can also be used for deleting lines from a particular file.

How to delete line start with # but not with #?

This will go through the file line by line and when it finds a line starting with #! it will be printed by the first expression. Then it will be deleted from the pattern space by the second expression (i.e. it will not be printed a second time by the default p command which is in effect when not using sed -n ).

How to remove lines from a Unix file?

Note: In all the above examples, the sed command prints the contents of the file on the unix or linux terminal by removing the lines. However the sed command does not remove the lines from the source file. To Remove the lines from the source file itself, use the -i option with sed command. > sed -i ‘1d’ file

Is there a way to remove lines from a source file?

However the sed command does not remove the lines from the source file. To Remove the lines from the source file itself, use the -i option with sed command. If you dont wish to delete the lines from the original source file you can redirect the output of the sed command to another file.

How to delete lines ending with the letter O?

To delete lines ending with a specific pattern or a character, for exmple to delete lines starting ending with character o or keyword amos; To combine the above such that you can delete lines ending with letter o or keyword amos;

Can a sed command be used as a semicolon?

But based on your comment that you want to do in-place editing, you can still do that with distinct commands ( sed commands rather than invocations of sed itself). You can either use multiple -e arguments or separate commands with a semicolon, something like (just one of these, not both):

How to delete a line with the keyword Green?

If you need to perform a dry run (without actually deleting the line with the keyword) and print the result to std output, omit option -i. For example, do delete a line containing the keyword green, you would run; Similarly, you could run the sed command with option -n and negated p, (!p) command.