Linux commands

List the files in linux/unix

ls - list the contents of the current directory
ls
ls -a
ls -lart
ll - Long Listing the files and directories

copy first column into a file:

awk ‘{ print $1 }’ access_log > clientips.txt

delete the matching pattern from a file:

:g/127.0.0.1/d

delete the duplicate patters:

sort client.txt | uniq > clientsfilnetered.txt