Some Linux Commands

Date and time

• date (show system date)
• cal 9 1751( show calendar)
• date mmddhhmmssyy ( set date & time)
• date 12051145302008

Find

• find / -name sam.txt (find a file)
• find / -iname sam.txt (search with capital & small)
• find / -size 1 mb (find files with 1 mb size)
• find / -size +1mb (find files > then 1 mb)
• find / -size -1 mb (find files <then 1 mb)
• find / -usr marc (find  user marc,s files )
• find / home –user marc (find user march in home )
• stat /data/sam.txt (displays file properties)
• touch /data/sam.txt (update the time)
• touch logitech
• find / -atime +10
• find / – atime -10
• find / -mtime +10
• find / -mtime -10
• find / -name india.txt –not –user mann
• find / -name kashmir.txt –not user root
• find / -name india.txt –not –size -10mb
• find / -name india.txt –and –user mann –not –size +10mb

Linux – File And directories

• rm abc  (can remove a file)
• mkdir abc (create a directory)
• rmdir abc (remove an empty directory)
• rm –r abc (delete directory recursively)
• mkdir /data (create a directory)
• mkdir /data/abc (create sub directory)
• pwd (print working directory)
• cd /data ( change the directory)
• cd (change to home directory)
• cd / (change to / directory)
• cd .. (come back one directory)
• cd – ( back to previous directory)
• tree /root ( to display directory structure)
• rm –rf  abc ( to delete a directory forcefully & recursively)
• ls (list of files and folders in current directory)
• ls –l (long listing of files & folders)
• ls –a (list all with hidden files & folders)
• ls /  (list files & folders )
• ls /abc/xyz (will list subdirectories)
• cp –rvf /abc/xyz  (copy recursively)
• ls *.txt (list .txt files)
• history (displays last inserted commands)
• !10 (run number 10th command)
• !cal (run last command started with cal)
• history –c (Clear all history)
• man/info date (manual files)
• makewhatis (creates what is database)
• whatis cal (displays use of cal command)
• cal > abc ( send output of cal  to file abc)
• date >> abc (append to abc file)
• more sales.txt (displays page contents page wise)
• history | more (displays history page wise)
• history | less (———— can up and down)
• history | tail -20 ( displays last 20 inserted lines)
• History > history.txt (send history to a file)
• tr ‘a-d ‘ ‘A-D’ < sam.txt ( display small to capital)
• tr ‘A-D ‘a-d’ < sam.txt (displays capital to small)