Remove Specific Line in Configuration Files

[PeterTeng]

It is possible to use sed command to remove specific line which match desired pattern

https://www.gnu.org/software/sed/manual/sed.html

sed Command Usage

$ cat a.txt
ip:111.111.111.111 text text text
ip:222.222.222.222 text text text
ip:333.333.333.333 text text text
ip:444.444.444.444 text text text

# Remove the line in file and print file with STDOUT
$ sed '/222.222.222.222/d' a.txt
ip:111.111.111.111 text text text
ip:333.333.333.333 text text text
ip:444.444.444.444 text text text

# Remove the line in file and modify the file
# In macOS --> sed -i '' '/222.222.222.222/d' a.txt 
$ sed -i '/222.222.222.222/d' a.txt 
$ cat a.txt
ip:111.111.111.111 text text text
ip:333.333.333.333 text text text
ip:444.444.444.444 text text text

[100010]

@PeterTeng thanks for your issue.

POSIX compliant sed as typified by BSD sed etc. is used as standard in OS X etc, but sed used in general Linux is often GNU sed. Therefore, if Linux users use OS X's sed, they will be confused with so-called "dialect" like differences such as options.

So I used pure shell script, what do you think?

[PeterTeng]

@100010 Thanks for the quick response!

I think this proxy server creation are mostly needed on Linux, so that the confusing "dialect" with sed command between macOS and Linux is not a big problem.

Linux Kernel/Distribution

Maybe by checking Linux distribution, we can "reject" user who want to create proxy server on macOS with this gem. Cause it is not a supporting OS.

# Kernel version
$ uname -a
$ cat /proc/version
# Distribution (/etc/os-release, /etc/system-release ...)
$ cat /etc/*-release