1. grep “example” -i -n /etc/libuser.conf
2. cat /etc/libuser.conf | grep “example” -i -n

the command will find “example” in “/etc/libuser.conf” file and print it with line number

1. grep “imp” /etc/*.conf –color
2. grep -i -r –include “*.bash” “domain” ./ –color

1. find /etc -type f -maxdepth 1 -iname “*.conf”

the command will find *.conf files without child directory in “/etc” directory

1. find /etc -type f -iname “*.conf” -exec grep “example” {} +

the command will find all “example” in all “*.conf” file in “/etc” directory and print the line

1. crontab -e

to edit crontab tasks.

• adduser shaoxp
• passwd shaoxp
• gpasswd -a shaoxp wheel
  • or sudo adduser shaoxp sudo

above commands will finish add shaoxp as admin user.

• awk '{print $6 “ ” $1 “ ” $9}' ./file
• awk '{print $6 “ ” $1 “ ” $9}' ./file| sort -n -r | more
• cat file | awk -F ' ' '{if($1>10){print $1}}' | wc -l