Find and replace with VI on a pathname is a bit tricky you ned to use escape characters.

In this case /bin/mail should be replaced with /usr/bin/mail

The command below would do it:

:%s/\/bin\/mail/\/usr\/bin\/mail/g

Find and Replace Example

Here is an example of find and replace with VI, this will replace every instance of […]

HOW TO CHECK WHETHER LINUX SERVER IS UNDER DDOS ATTACK

DDOS – Distributed Denial of service attack

DDOS or DOS (Denial of service ) is an attack in the server , where the server resources become unavailable to the users. It can be typically defined as the loss of network connectivity and […]

zip is a nice, cross-platform compression software, similar in purpose to WinZip or GZip. &zip can create and extract those .zip and .gz (and tar.gz) files, but it uses LZMA for its own native compression, which is a much more modern compression format. (if you’re using .rar, please stop already).

Use 7zip to create a […]

Method 1: Using grep

$ grep -v ‘^$’ infile.txt > outfile.txt

Method 2: Using sed

$ sed ‘/^$/d’ infile.txt > outfile.txt

To remove blank lines from multiple files a script like the one below can be used

#!/bin/sh files=”/somefolder/*.txt” for f in $files do sed ‘/^$/d’ $f > $f.tmp mv $f.tmp $f done

tar [-cxtzjvfpPN] file and directory …. parameters:

-c: create a compressed file parameters command (create mean); -x: parameter instructions to unlock a compressed file! -T: View file tarfile inside! Special attention to the parameters issued, c / x / t only the existence of a! Not exist! Because it is not possible at the same […]