remove everything except one file linux code example

Example 1: delete all the files without one in linux

# delete all except the filename

$ rm -v !("filename")

Example 2: how to remove all files except one in linux

# if you are using a loop

shopt -s extglob

rm -rf !("abc.txt" | "abc.log" )  # others will be removed except these two

shopt -u extglob

Example 3: linux remove lines from file

> sed '2,4d' file